JP3360257B2 - Seismograph - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention measures the reflected wavelength of a laser beam converted in response to an externally applied force to an optical fiber grating (optical fiber diffraction grating), and calculates translational acceleration in three directions, horizontal and vertical. The present invention relates to a seismometer capable of detecting a rotational angular acceleration in addition to the detection of a rotation angle acceleration.

[0002]

2. Description of the Related Art Applicants and others attempt to improve the detection sensitivity of sensors by averaging the detection outputs of a plurality of stacked force sensors, and also provide a cylindrical optical fiber roll with an apparent servo function. Patent No. 2,896,374 discloses an invention relating to a seismometer that detects horizontal and vertical accelerations fx, fy, and fz in a three-dimensional horizontal and vertical direction by exerting a servo function without acting as a member having a special function. (Japanese Patent Application No. 10-60394).

The outline of a seismometer for detecting acceleration in a two-dimensional direction, which is shown as an example, will be described with reference to FIG. And each rigid plate 105B
When a horizontal acceleration is applied in the direction of arrow F, a plurality of force sensors each having a cylindrical optical fiber roll 105A to 112A responsive to a pressure change are laminated on the surfaces of the optical fiber roll 105A. ~ 11
Phase displacement light obtained by averaging the output lights of 2A is output. The elastic members of the optical fiber rolls 105A to 112A allow the load members 102 and 103 and the rigid plate 10 to be mounted.
The load bodies 102 and 103 and the rigid plates 105B to 112 are positioned at a position that balances the pressing force due to the displacement between the load plates 5B to 112B.
The servo function to stop the displacement with B is exhibited.

[0004] On the other hand, measures the water level, as water pressure sensor for monitoring comprises an optical fiber grating, converts the variation of tension being generated on the basis of the variation of water level wavelength lambda of the laser excitation light to the displacement wavelength lambda _i Japanese Patent No. 2879767 (Japanese Patent Application No. 10-6) discloses an invention of a
0397).

The operation of this sensor will be described with reference to FIG. 20. An optical fiber grating 208 is built in a container 207 made of a flexible thin film bag or the like, and the sensor is perpendicular Sufficient amount of viscous liquid 20 to apply water pressure from
9 are filled. Water pressure is applied to the container 207, and a hydrostatic pressure j is applied to the outer peripheral surface of the optical fiber grating 208 to reduce its diameter and expand it in the longitudinal direction. By increasing, the laser light source 212
When a laser excitation light having a wavelength λ from the incident light is incident, a specific wavelength λ _i1 is reflected and incident on a wavelength measuring device (not shown) via the optical coupler 214, where the measured and coded water pressure signal is converted. Transmit to ground station.

[0006]

By the way, Japanese Patent Application No. 2896374 (Japanese Patent Application No. Hei 10 (1996)) discloses the above-mentioned seismometer.
According to Japanese Patent Application Laid-Open No. -60394), although it is possible to detect the translational acceleration of the three horizontal components of XYZ by a sensor using an optical fiber, the rotational angular acceleration ω _XY acting on the load body in the XY plane, No proposal has been made for the detection of the acceleration of the rotational angular velocity ω _YZ , the rotational angular velocity ω _ZX in the ZX plane, and the detection of the translational acceleration applied to the load body of the seismometer by a force sensor consisting of an optical fiber grating. The enabling device has not yet been put to practical use.

Therefore, an object of the present invention is to measure the displacement wavelength of the oscillation frequency of the laser light converted in response to the externally applied force to the optical fiber grating, and to measure the horizontal and vertical wavelengths.
It is an object of the present invention to provide a seismometer capable of simultaneously detecting the rotational acceleration in the three directions as well as the translational acceleration in the directions.

Another object of the present invention is to provide a clamping mechanism for a polyhedral solid load body.

[0009]

According to a first aspect of the present invention, there is provided a seismometer according to the present invention, wherein a solid load body having a polyhedral shape is formed by interposing a space from each inner surface of a casing having a hollow polyhedral shape. Each of the center positions of the solid load bodies is arranged so as to be located at the coordinate origin of the XYZ axes, and the center of each inner surface in the + X axis direction and the −X axis direction of the casing in the X axis direction, and + X axis direction and-
A support wire connected to one end and the other end of the optical fiber grating (+ X) is provided at the center of each outer surface in the X-axis direction, respectively.
X) are fixedly connected to one end and the other end of the casing, the center of each inner surface in the + Y-axis direction and the −Y-axis direction of the casing in the Y-axis direction, and the + Y-axis direction and − A support wire connected to one end and the other end of the optical fiber grating (+ Y) was connected to the center of each outer surface in the Y-axis direction, and connected to one end and the other end of the optical fiber grating (-Y). Fix the support line, Z
Optical fiber gratings at the center of each inner surface of the casing in the + Z axis direction and -Z axis direction in the axial direction, and at the center of each outer surface in the + Z axis direction and -Z axis direction of the solid load body, respectively. A solid load is applied to the casing by fixing a support wire connected to one end and the other end of (+ Z) and a support wire connected to one end and the other end of the optical fiber grating (-Z). Relative displacement corresponding to the translational acceleration F
The optical fiber grating captures the laser excitation light with different wavelengths from the optical fiber grating based on the relative displacement of the solid load body with respect to the casing. On the basis of the amount of change in each of the displaced reflected wavelength output signals, the data is transmitted to a data processing device that outputs discrimination data indicating the direction of application of the translational acceleration applied to the casing and the magnitude thereof.

According to a second aspect of the present invention, in the data processing apparatus, the polarity and the magnitude of the polarity calculated from the difference between the reflected wavelength output signals of the optical fiber grating (+ X) and the optical fiber grating (-X) are provided. And the optical fiber grating (+ Y) and the optical fiber grating (-Y) based on the signal indicating the polarity and magnitude thereof calculated from the difference between the reflected wavelength output signals of the optical fiber grating (-Y) and the optical fiber Based on a signal indicating the polarity and the magnitude calculated from the difference between the reflected wavelength output signals of the grating (+ Z) and the optical fiber grating (-Z), in the X-axis direction, the Y-axis direction, or the Z-axis direction. It is characterized in that it outputs discrimination data indicating from which direction and to what magnitude the translational acceleration is applied.

According to a third aspect of the present invention, the solid load body in the polyhedral casing has a spherical shape or the polyhedral casing has a spherical shape and the solid load body in the casing has a polyhedral shape. Or both the casing and the solid load body have a spherical shape.

According to a fourth aspect of the present invention, a space is interposed from each inner surface of a casing having a hollow polyhedral shape.
The solid load body having a polyhedral shape is arranged such that the respective center positions of the casing and the solid load body are located at the coordinate origin of the XYZ axes, and the center of the outer surface in the + X axis direction of the solid load body and the casing, Each of the supporting wires connected to one end face of one of the optical fiber gratings (+ X1) and (+ X2) arranged on the inner surface separated in the ± Y-axis direction with an orthogonal point orthogonal to the + X axis interposed therebetween. By connecting the end and each end of the support wire connected to the other end face, V in the XY plane
The inside of the solid load body separated in the ± Y-axis direction from the center of the outer surface of the solid load body in the −X-axis direction and the orthogonal point of the casing orthogonal to the −X-axis. On the side,
Side-by-side optical fiber gratings (-X3),
By connecting each end of the support line connected to one end surface of (-X4) and each end of the support line connected to each other end surface, a V-shape is formed on the XY plane. On the center of the outer surface of the solid load body in the + Y-axis direction and the inner surface of the casing separated in the ± Z-axis direction across an orthogonal point perpendicular to the + Y-axis. By connecting each end of the support wire connected to one end face of each of the optical fiber gratings (+ Y1) and (+ Y2) and each end of the support wire connected to each other end face, YZ is obtained.
It is stretched and supported to form a V-shape in a plane, and the center of the outer surface in the −Y-axis direction of the solid load body and the ± Z-axis direction across the orthogonal point of the casing orthogonal to the −Y axis. A portion where the ends of the support wires connected to one end of each of the optical fiber gratings (-Y3) and (-Y4) are united with the separated inner surface, Each end of the support wire connected to the end face is stretched and supported so as to form a V-shape in the YZ plane, and the center of the outer surface of the solid load body in the + Z axis direction and the + Z axis of the casing are supported. The optical fiber gratings (+ Z1), (+
Z2), by connecting a portion where the ends of the support wires connected to one end face are united and each end of the support wire connected to the other end face, a V-shape is formed on the ZX plane. The inner surface of the solid load body is separated from the center of the outer surface in the -Z-axis direction and the casing, in the ± X-axis direction, across an orthogonal point perpendicular to the -Z-axis. And the optical fiber gratings (-Z3) and (-Z
4) A V-shape is formed on the ZX plane by combining the ends of the support lines connected to the respective one end surfaces and the ends of the support lines connected to the other end surfaces. The solid load body is relatively displaced in accordance with the translational acceleration K or the rotational angular acceleration ω applied to the casing by stretching and supporting the casing so that the acceleration is applied to each optical fiber grating. And each optical fiber grating takes in laser excitation light having a different wavelength, and displaces the load relative to the translational acceleration K or the rotational angular acceleration ω applied to the casing. , Based on the change of each reflected light wavelength output signal from the optical fiber grating based on the relative displacement,
The present invention is characterized in that the direction of application of the translational acceleration K or the rotational angular acceleration ω applied to the casing and the measurement signal indicating the magnitude thereof are transmitted to a data processing device that outputs the measurement signal.

According to a fifth aspect of the present invention, in the data processing device, the optical fiber gratings (+ X1) and (+ X1)
X2) the sum of the reflected wavelength output signals and the optical fiber
From the polarity and magnitude obtained from the difference between the reflection wavelength output signals of the gratings (-X3) and (-X4) and the magnitude thereof, a translation acceleration Kx of any magnitude in any direction in the X-axis direction is applied. The measurement data indicating whether or not the reflection has been performed is output, and the sum of the reflection wavelength output signals of the optical fiber gratings (+ Y1) and (+ Y2) and the reflection wavelength outputs of the optical fiber gratings (-Y3) and (-Y4) are output. From the polarity and magnitude obtained from the difference between the signal and the added value, measurement data indicating from which direction in the Y-axis direction the magnitude of the translational acceleration Ky was applied is output.
The sum of the reflection wavelength output signals of the gratings (+ Z1) and (+ Z2) and the optical fiber grating (−
From the polarity and magnitude obtained from the difference between the reflection wavelength output signals Z3) and (−Z4), it is possible to determine from which direction in the Z-axis direction the magnitude of the translational acceleration Kz was applied. Output the measured data
The difference between the output signals of the gratings (+ X1) and (+ X2), or the optical fiber grating (−
From the polarity and magnitude obtained from the difference between the reflected wavelength output signals of X3) and (−X4), the application direction and magnitude of the rotational angular acceleration ω _XY applied to the load body around the Z axis are determined. The measured data shown is output, and the difference between the reflected wavelength output signals of the optical fiber gratings (+ Y1) and (+ Y2), or the optical fiber gratings (−X3) and (−
X4) Outputs measurement data indicating the direction of application of the rotational angular acceleration ω _YZ applied around the X-axis to the load and the magnitude from the polarity and magnitude obtained from the difference between the reflected wavelength output signals of X4). Then, the polarity and magnitude thereof are determined from the difference between the reflected wavelength output signals of the optical fiber gratings (+ Z1) and (+ Z2) or from the difference between the reflected wavelength output signals of the optical fiber gratings (-Z3) and (-Z4). Therefore, the application direction of the rotational angular acceleration ω _ZX applied to the load body around the Y axis and the measurement data indicating the magnitude are output, and the ± X axis direction, ± Y axis direction, or ± Z axis direction And the presence or absence of a signal indicating the magnitude of each polarity and the direction of application of the translational acceleration applied to the casing based on the determination result, and a measurement signal indicating the magnitude of the translational acceleration applied to the casing. Around X axis, around Y axis, Or, the direction of application of the rotational angular acceleration about the Z axis, and the presence or absence of the magnitude is determined, based on the determination result around the X axis, around the Y axis of the casing,
Alternatively, it outputs a direction of application of the rotational angular acceleration applied around the Z axis and a measurement signal indicating the magnitude thereof.

According to a sixth aspect of the present invention, the solid load body in the polyhedral casing has a spherical shape, or the polyhedral casing has a spherical shape and the solid load body in the casing has a polyhedral shape. Or both the casing and the solid load body have a spherical shape.

According to a seventh aspect of the present invention, each of the at least one pair of two shafts penetrates from the outside of the casing to a substantially central portion of the axial length of a corner edge located on a diagonal line of the casing. Or inside the casing,
Each of the shafts is located at a position substantially opposite to the axial center of the inner diagonal line of the casing and substantially opposite to the axial center of the diagonal edge of the solid load body. An angle member having an L-shaped cross section provided at one end of the body has a cushion member on an engagement surface facing the above-mentioned corner portion of the solid load body, and a worm gear is engraved on the other end of the shaft body. A solid load lock mechanism in which a motor for driving a pinion that meshes with the worm gear is fixed. The engaging and disengaging of the mating surface and the edge of the solid load body is performed.

According to an eighth aspect of the present invention, the optical fiber grating is connected in parallel to a laser excitation light emitting side, and an optical fiber is connected to each end of the optical fiber grating in the transmitted light propagation direction. A transmitted light absorption spectrum measuring device is connected to each end of the optical fiber, and each reflected wavelength output signal whose wavelength is displaced from the optical fiber grating is emitted, and from each transmitted light absorption spectrum measuring device, from each optical fiber grating The reflected light data and the transmitted light data are output by emitting each absorption spectrum wavelength that specifies the wavelength of each reflected wavelength output signal.

According to a ninth aspect of the present invention, the optical fiber grating is connected in series to a laser excitation light emitting side, and an optical fiber is connected to an end of the optical fiber grating in a transmitted light propagation direction. The transmitted light absorption spectrum measuring instrument is connected to the tip of the optical fiber grating, and the reflected wavelength output signal whose wavelength is shifted from the optical fiber grating is emitted, and the reflected wavelength output from each optical fiber grating is transmitted from the transmitted light absorption spectrum measuring instrument It is characterized in that reflected light data and transmitted light data are output by emitting each absorption spectrum wavelength that specifies a signal wavelength.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a graph showing the relationship between the acceleration (tension) applied to the optical fiber grating and the amount of change in the reflected light wavelength that fluctuates in response thereto.
5 are diagrams showing a first embodiment of the seismometer of the present invention, and FIG. 2 is a diagram showing a casing 2 shown by a dotted line in FIG. FIG. 3 is a perspective view of the seismometer which is moved and seen through the inside thereof, as viewed from the direction of arrow A. FIG. 3 is a view of FIG.
5 is a view of the casing 2 seen from the direction of arrow C in FIG. 5, and FIG. It is a perspective view of.

As shown in FIG. 5, the seismometer 1 fixed to a support base (not shown) is hollow, that is, cylindrical, for example, has a regular hexahedron shape, and has an opposing opening 2
In the casing 2 which can be closed by A and 2B, for example, a solid load body 3 having a regular hexahedron shape has its center point located at the center point of the casing 2 (the coordinate origin of the XYZ axes), and With an interval from the inner surface of 2,
As described below, it is suspended and supported so as to be displaceable in the XYZ directions. After the optical fiber grating is attached, as shown in the characteristic graph of FIG. 1, the acceleration (tension) applied to the optical fiber grating and the optical fiber extending in the axial direction corresponding to the acceleration are determined in advance.
The relationship with the change in the wavelength of the reflected light from the grating is determined in advance.

Next, referring to FIG. 2 (FIG. 5), the center of both sides of the solid load 3 orthogonal to the X axis and the optical fiber grating 4 (+
X) and 6 (-X) are supported by rigid support wires 5 and 7 made of, for example, steel, and the optical fiber gratings 4 (+ X) and 6 (-X).
The center part of the other end face of (−X) and the center parts h1 and h2 of the tension adjusting members H and H for the optical fiber grating fixed to the center part of the inner surface of the casing 2 and orthogonal to the X axis are supported. Supported by lines 5 and 7. Further, Z of the load 3
Optical fiber gratings 12 (+ Z) and 14 for detecting the translational acceleration in the Z direction
The center of one end face of (-Z) is supported by support lines 13 and 15 and the optical fiber grating 12 is supported.
(+ Z), the center of the other end face of 14 (−Z), and the center h5 of the inner surface of the tension adjusting members H, H similarly fixed to the casing 2 for the optical fiber grating, which are orthogonal to the Z axis. , H6 are supported by support lines 13 and 15.

The tension adjusting member H can be manually or automatically adjusted to pull or loosen each support line to which tension is constantly applied, so that the tension adjusting member H is in a quiet state without an external acceleration applied. In other words, fine adjustment is made while observing the reflection wavelength data so that a certain tension is applied to each optical fiber grating in a state where there is no applied stretching force at the time of actual measurement.

Referring to FIG. 3 (FIG. 5), the Y
Optical fiber gratings 8 (+ Y) and 10 for detecting the translational acceleration in the Y direction
The center of one end face of (−Y) is supported by support lines 9 and 11, and the optical fiber grating 8 (+
Y) The center of the other end face of 10 (-Y) and the center of the inner surface of the tension adjusting members H, H for the optical fiber grating fixed to the center of the inner surface of the casing 2 at right angles to the Y axis. By supporting h3 and h4 with the support lines 9 and 11, when a translational acceleration F is applied to the casing 2 from the XY or Z directions, the solid load body 3 can be displaced in the XYZ directions with respect to the casing 2. It is suspended.

FIG. 4 (FIG. 5) shows a solid load body 3 and an optical fiber grating 12 for detecting a translational acceleration in the Z direction.
(+ Z), 14 (−Z), and optical fiber gratings 8 (+ Y), 10 (−) for detecting translational acceleration in the Y direction.
Y) shows the support state, and the support is as described above, so the re-statement is omitted.

FIG. 6 shows two sets of solid load body clamping mechanisms 300 of the seismometer 1 viewed from the direction of arrow A (FIG.
), And the four electric motors 306 each having a pinion 305 mounted on a rotary shaft are fixedly mounted on a support frame (not shown) disposed diagonally outside the casing 2. Then, one pair of shafts 301, 301 and the other pair of shafts 301, 30
1 penetrates from the outside of the hexahedral casing 2 to a substantially central portion of the axial length of a corner edge located on both diagonal lines of the casing 2, and further has a hexahedral solid load body 3.
Are positioned so as to oppose substantially the center of the axial length of the corner edge located on both diagonal lines. And each shaft body 301
Member having a substantially L-shaped cross section provided at one end of
A cushion member 303 made of rubber, felt, or the like is attached to the engagement surface of the solid load body 3 facing the corner edge. On the other hand, the worm gear 304 engraved on the other end of each shaft body 301 is engaged with the above-described pinion 305, whereby the solid load body locking mechanisms 300 are formed.

When the seismometer 1 is transported to the observation site, each motor 306 is driven to rotate in the normal direction, and each shaft body 301 is moved to a solid load body in order to prevent vibration and impact from being applied to the optical fiber grating. The solid load body 3 is locked by displacing toward the corners of the solid load body 3 by locking the engagement surfaces of the angle members 302 and the corner edges of the solid load body 3. After the seismometer 1 is installed at the installation location, the electric motor 306 is reversely driven to displace each shaft body 301 so as to be separated from the corner of the solid load body 3, and the engagement surface of each angle member 302 and the solid surface The lock of the load body 3 with the corner is released, and the solid load body 3 is placed in an observation state.
In the above embodiment, two sets of solid load body clamping mechanisms 300
However, a set of solid load body clamping mechanisms is sufficient.

It is also possible to provide a clamp mechanism 300 inside the casing 2. In this case, one end of each shaft body 301 is located inside the casing 2 and at a position facing the substantially central portion of the axial length of the inner diagonal line of the casing 2, and the other end Are positioned so as to face substantially the center of the axial length of the corner edge located on both diagonal lines of the solid load body 3, and the worm gear 304 provided at one end of the shaft body 301 has
The pinion 305, which is pivotally mounted on the electric motor 306 fixed inside the casing 2, is engaged with the other end.
As shown in the above embodiment, the cushion member 30
The angle member 302 provided with 3 is attached.

FIG. 7 shows a measurement block diagram of the seismometer according to the present invention.
The wavelength measuring unit 20 is provided with the following components. That is, the wavelength λ ₁ , based on a command signal transmitted from an observation station (not shown) installed at a remote point via the external cable 31 that accommodates both the power supply line and the optical fiber,
A laser light source 22 that intermittently excites and emits a laser beam 28 having λ ₂ , λ ₃ , λ ₄ , λ ₅ , and λ ₆ , and prevents incidence of reflected light from the emission side, The laser light is transmitted to the optical couplers 24A to 24F, and the light emitted from the isolator 23 is transmitted to the optical couplers 24A to 24F.

Optical fiber grating 4 (+ X)
Is a wave through the optical coupler 26A and the optical fiber 25A.
Long λ₁Optical fiber grating
In response to the stretching force applied to ring 4 (+ X),
The wavelength displacement counter that expands and contracts and has a level proportional to this expansion force
Laser beam λ_1iThrough the optical fiber 29A, for example,
Wavelength measuring instrument 27A including Fabry-Perot wavelength meter
Send light. Optical fiber grating 6 (-X)
Wavelength λ via the optical coupler 26B and the optical fiber 25B.
_TwoOptical fiber grating
6 (-X) The wavelength of the level proportional to the stretching force applied
Displacement reflected laser beam λ_2iThrough the optical fiber 29B.
The light is transmitted to the length measuring device 27B. Optical fiber grating
Group 8 (+ Y) is an optical coupler 26C and an optical fiber 25.
Wavelength C through C_TwoLaser light
・ Proportional to the stretching force applied to grating 8 (+ Y)
Wavelength displacement reflected laser beam λ_3iThe optical fiber
The light is transmitted to the wavelength measuring device 27C via 29C. Optical fi
The grating 10 (-Y) is an optical coupler 26D
And the wavelength λ via the optical fiber 25D._FourLaser light
Into the optical fiber grating 10 (-Y)
Wavelength displacement reflection laser at a level proportional to the applied stretching force
Light λ_4iTo the wavelength measuring device 27D via the optical fiber 29D.
To send light. Optical fiber grating 12 (+ Z)
Is a wave through the optical coupler 26E and the optical fiber 25E.
Long λ_FiveOptical fiber grating
Level proportional to the stretching force applied to the ring 12 (+ Z)
Wavelength displacement reflected laser light λ_5iThrough the optical fiber 29E.
Then, the light is transmitted to the wavelength measuring device 27E. Optical fiber gray
14 (-Z) is an optical coupler 26F and an optical fiber.
Wavelength λ ₆Captures the laser light of the
Stretch applied to fiber grating 14 (-Z)
Wavelength displacement reflected laser beam λ at a level proportional to the compressive force_6iTo
Transmits light to the wavelength measuring device 27F via the optical fiber 29F.
You.

Next, referring to FIG. 8 showing a circuit block diagram of the wavelength measuring devices 27A to 27F,
In A to 27F, the optical fiber grating 4 (+
X), 6 (−X), optical fiber grating 8 (+
Y), 10 (−Y), and the reflected wavelength output lights λ _1i , λ _2i , λ _3i , λ _4i , λ _5i , and λ _6i from the optical fiber gratings 12 (+ Z) and 14 (−Z), respectively. After the light is incident on the wavemeter and measured, the output light having a level proportional to the applied expansion and contraction force is incident on the data transmitting unit, photoelectrically converted into a level signal, code-converted, and placed on a carrier wave of frequency FK, for example. The data is transmitted to the data processing device 35 of the observation station (not shown) via the cable 31.

The function will be described with reference to a functional block diagram of the data processing device 35 shown in FIG. 9A. In the detection unit 351, the optical fiber grating 4 (+
X), 6 (−X), optical fiber grating 8 (+
Y), 10 (−Y), optical fiber grating 12
The reflected wavelength output signals λ _1i , λ _2i , λ _3i , having a level proportional to the applied stretching force from (+ Z) and 14 (−Z).
λ _4i , λ _5i , and λ _6i are fetched and stored in the memory. When the reflected wavelength output signal λ _ji at a level proportional to the applied stretching force and the applied stretching force described above are all zero, that is, the reflected wavelength output signal λ _ji ⁽⁰⁾ (j = 1, 2,
... 6) and its variation signal Δλ _ji ⁽⁰⁾ (j
= 1, 2,... 6) is expressed as Δλ _ji = λ _ji −λ _ji
⁽⁰⁾ (j = 1, 2,..., 6).

The X component calculator 352 calculates the polarity and the magnitude of the difference from the differences Δλ _1i and Δλ _2i of the reflected wavelength output signals of the optical fiber gratings 4 (+ X) and 6 (−X). Then, the Y component calculation unit 353 calculates the polarity and the magnitude of the difference from the differences Δλ _3i and Δλ _4i of the reflected wavelength output signals of the optical fiber gratings 8 (+ Y) and 10 (−Y). , Z component calculator 354 calculates the polarity and the magnitude of the difference from the difference Δλ _5i , Δλ _6i of each reflected wavelength output signal of the optical fiber gratings 12 (+ Z) and 14 (−Z), Store in memory.

At this time, the signal Δλ _ji of each change is a reflected wavelength output signal λ _1i having a level proportional to the applied stretching force.
And to [lambda] _6i, previously reflection wavelength output signal λ _ji ⁽⁰⁾ at the time of the memory or may be stored in a quiet (j = 1,2, ··· 6) it can of course be determined from the difference between the.

The measuring section 355 outputs each reflection wavelength of the X component.
Force signal change Δλ_1i, Δλ_2i, Is 0, and Y
Component change Δλ of each reflected wavelength output signal_3i, Δλ_4iDifference
Is 0, and the change Δ of each reflected wavelength output signal of the Z component
λ_5i, Δλ_6iDepending on the polarity obtained from the difference
Judging from which axis direction the translational acceleration was applied,
The magnitude of the translational acceleration is determined from the magnitude of the difference
Change Δλ of each reflected wavelength output signal_3i, Δλ_4iIs 0
And the change Δ in the output signal of each reflected wavelength of the Z component
λ_5i, Δλ_6iIs zero, the output of each reflection wavelength of the X component
Force signal change Δλ _1i, Δλ_2iPolarity obtained from the difference
Translational acceleration is applied from any axis direction of the X axis
Judge whether or not the translational acceleration is large.
Is determined, and the change Δ of each reflected wavelength output signal of the X component is determined.
λ_1i, Δλ_2i, And the reflection wavelength of each Z component
Output signal change Δλ_5i, Δλ_6iIs 0, and Y
Component change Δλ of each reflected wavelength output signal_3i, Δλ_4iDifference
Which axis of the Y axis depends on its polarity
The translational acceleration applied from the direction
Then, the magnitude of the translational acceleration is determined. In addition, X, Y, Z
In the general case where translational acceleration is mixed, as described above,
Optical fiber gray oppositely arranged on the + and-sides of the direction axis
Change Δλ in the reflected wavelength output signal_ji(J = 1,
2,... 6), the X, Y, and Z directions
Various translational acceleration components can be calculated. further,
If no translational acceleration is applied, the X component calculation unit
352, Y component calculation unit 353, and Z component calculation unit 354
Output a 0 signal.

The operation of the seismometer 1 configured as described above will be described with reference to the flowchart shown in FIG. Based on the command signal from the observation station, the laser light source 22
Converts the laser light 28 having the wavelengths λ ₁ , λ ₂ , λ ₃ , λ ₄ , λ ₅ , and λ ₆ through the isolator 23 into the optical coupler 2.
Transmit light to 4A to 24F. (1) Description of application of only translational acceleration Fz from the Z-axis direction Now, as shown in FIG.
When only the translational acceleration Fz indicated by an arrow is applied from the Z-axis direction, the load 3 is relatively displaced in the + Z-axis direction from the initial position, and as a result, the optical fiber grating 12 (+
A compression force is applied to the grating of Z), and an elongation force is applied to the grating of the optical fiber grating 14 (-Z). For this reason,
From the optical fiber grating 12 (+ Z), the grating pitch decreases in response to the compressive force, and the reflected wavelength output signal λ
_5i is output and the optical fiber grating 14 (−
From Z), the grating pitch increases in response to the stretching force, and a reflected wavelength output signal λ _6i having a wavelength larger than the signal λ _5i is output.

The output signal λ _5i is _supplied to the optical fiber 25E,
The light is transmitted to the wavelength measuring device 27E via the optical coupler 26E and the optical fiber 29E, and the output signal λ _6i is
5F, light is transmitted to the wavelength measuring device 27F via the optical coupler 26F and the optical fiber 29F, and the wavelength is measured, respectively.
The signal is photoelectrically converted into a level signal and encoded.
To the data processing device 35 of the observation station via

Detection unit 35 of data processing unit 35 of the observation station
1, the reflection wavelength output signal lambda _5i, captures the lambda _6i, reflection wavelength output signal lambda _5i during quiet ^(0), the variation [Delta] [lambda] _5i of the difference between the lambda _6i ^(0), and stores the [Delta] [lambda] _6i in memory (Step S
1). Of course, the wavelength output signals λ _1i , λ _2i from the optical fiber gratings 4 (+ X) and 6 (−X) and the optical fiber gratings 8 (+ Y) and 10 (−Y) converted into the electric level signals. λ _3i , λ _4i and the calculated change Δλ _ji (j = 1, 2, 3, 4) are also stored in the memory.

The Z component calculation unit 354 stores the data stored in the memory.
Change Δλ in reflected wavelength output signal _5iAnd Δλ_6iCall
Out, optical fiber grating 12 (+ Z), 14
The difference of the change of the output signal of (−Z) is compared, and the difference signal is compared.
And the magnitude of the difference signal are stored in the memory.
Step S4).

Note that the optical fiber grating 4 (+ X) and the optical fiber grating 6 (-
X) is displaced by the same amount in the + Z-axis direction with the center points h1 and h2 of the inner surface of the casing 2 fixed together with the load 3 so that both signals are canceled and the optical fiber grating 8 ( + Y) and the optical fiber grating 10 (-Y) are also displaced in the + Z-axis direction together with the load body 3 with the center points h3 and h4 on the inner surface of the casing 2 fixed (see FIG. 2). Canceled. Therefore, in the measurement of the translational acceleration in the Z-axis direction, the optical fiber grating 4 (+ X) in the X-axis direction
The difference output of the change of the reflected wavelength output signal between 0 and 6 (−X) is 0, and the optical fiber grating 8 (+ Y) in the Y-axis direction.
And the difference output of the change in the reflected wavelength output signal of 10 (−Y) is also 0. Therefore, as described above, since the X component calculation unit 352 and the Y component calculation unit 353 cancel the output signals of the X components and the Y components, the difference output signal 0 of the X components is stored in the memory (step S2). , And a difference output signal 0 between the Y components (step S3).

Then, the measuring unit 355 outputs the optical fiber gratings 4 (+ X) and 6
The difference output signal corresponding to the change of (−X), that is, fx is 0, the difference output signal corresponding to the change of the optical fiber gratings 8 (+ Y) and 10 (−Y), that is, fy is 0, and Optical fiber gratings 12 (+ Z) and 14 (-Z)
Based on the polarity of the difference output signal corresponding to the change and the magnitude of the difference, the fact that the translational acceleration Fz has been applied from the + Z-axis direction and fz data indicating the magnitude are output (step S5).
When the polarity is opposite, the application direction of the translational acceleration Fz is identified as being from the −Z axis direction. (2) Description of application of only translational acceleration Fx from the X-axis direction As shown in FIG. 3, when only the translational acceleration Fx indicated by an arrow is applied from the −X-axis direction, the load body 3 moves relative to the −X-axis direction. The optical fiber grating 6 (−X) is displaced and a compressive force is applied to the optical fiber grating 6 (−X).
Optical fiber grating 6
The reflected wavelength output signal λ _2i is output from (−X), and the signal λ _2i is output from the optical fiber grating 4 (+ X).
_An output signal λ _1i having a wavelength larger than _2i is output. The output signal λ _1i is _supplied to the optical fiber 25A and the optical coupler 2
The reflected wavelength output signal λ _2i is transmitted to the wavelength measuring device 27A via the optical fiber 6B and the optical fiber 29A.
The light is transmitted to the wavelength measuring device 27B via the optical coupler 26B and the optical fiber 29B, photoelectrically converted into a level signal, code-converted, and transmitted to the observation station via the outer cable 31.

The X component calculator 352 determines the polarity and magnitude of the optical fiber grating 4 (+ X) from the difference between the change Δλ _1i and Δλ _2i of the reflected wavelength output signal of 6 (−X) ( Step S2). Also, the Y component calculation unit 3
53, in the Z component calculation unit 354, the optical fiber grating 8 (+ Y),
10 (-Y) are the center points h3 and h4 of the inner surface of the casing 2
Are fixed in the −X-axis direction by the same amount, the two signals are cancelled. Similarly, the optical fiber gratings 12 (+ Z) and 14 (−Z) in the Z-axis direction are 2 are displaced in the −X-axis direction with the inner surface center points h5 and h6 as fixed points (see FIG. 3), so both signals are canceled. Therefore, the output signals between the Y components and between the Z components cancel each other, and the difference output signal between the Y components (Step S3) and the difference output signal between the Z components become 0 (Step S4).

In the measuring section 355, the Y component calculating section 353
Of the change in the reflected wavelength output signal between the Y components,
Where fy is 0 and the Z components from the Z component
The difference of the change of the reflected wavelength output signal, that is, fz is 0
And the optical fiber grating of the X component calculating section 352.
4 (+ X) and 6 (−X) of the reflected wavelength output signal
Change Δλ_1i, Δλ_2iFrom the difference between the polarity and the magnitude
Is output, the translational acceleration Fx is output.
Is added from the −X axis direction and the size is
It is separated (step S5). When the above polarity is reversed
The horizontal acceleration Fx is applied from the + X axis direction.
Is identified. (3) Description of application of only translational acceleration Fy from the Y-axis direction As shown in FIG. 4, horizontal acceleration indicated by an arrow from the -Y-axis direction
When only the degree Fy is applied, the load 3 moves in the −Y axis direction.
Displaced to make the optical fiber grating 10 (-Y)
A compressive force is applied, and the optical fiber grating 8 (+
Since the elongation force is applied to Y), optical fiber grating
From the reflected wavelength output signal λ. _4iIs output
From the optical fiber grating 8 (+ Y)
Signal λ_4iWavelength output signal with larger wavelength than
Number λ_5iIs output. Output signal λ_3iIs an optical fiber 25
E, wave through optical coupler 26E and optical fiber 29E
Is transmitted to the length measuring device 27E and the output signal λ_4iIs an optical fiber
Via 25F, optical coupler 26F and optical fiber 29F
Is transmitted to the wavelength measuring instrument 27F, where it is converted into a level signal.
After photoelectric conversion, code conversion, and through the exterior cable 31
It is transmitted to the observation station.

In the Y component calculation section 353 of the data processing device 35 of the observation station, the optical fiber grating 8 (+ Y)
And the change Δλ _3i , Δ of the reflected wavelength output signal of 8 (−Y)
From the difference of λ _4i , its polarity and magnitude are obtained (step S3). Further, the X component calculation unit 352 and the Z component calculation unit 3
At 54, the optical fiber gratings 12 (+ Z) and 14 (-Z) are fixed at the center points h5 and h6 on the inner side surface of the casing 2 as the fixed points, as the load body 3 is relatively displaced.
Since the signals are displaced by the same amount in the axial direction, both signals are cancelled.
(+ X) and 6 (−X) are also displaced in the −Y axis direction with the center points h1 and h2 of the inner surface of the casing 2 fixed as well as the load body 3 (see FIG. 4), so both signals are canceled. Therefore, the output signals of the Y components and the Z components cancel each other, and the difference output signal of the compared Y components (step S3) and the difference output signal of the Z components (step S4) become 0.

The measuring unit 355 calculates the difference in the change in the reflected wavelength output signal between the Y components from the Y component calculating unit 353, that is, the fy component is 0, and the reflected wavelength output between the Z components from the Z component calculating unit 354. The difference between the signal changes, that is, the fz component is 0, and the change Δλ _1i between the optical fiber grating 4 (+ X) of the X component calculator 352 and the reflected wavelength output signal of 6 (−X), By outputting data of the fx component indicating the polarity and the magnitude from the difference of Δλ _2i , the fact that the translational acceleration Fx has been applied from the −X-axis direction and the magnitude thereof are identified (step S5). . When the polarity is opposite, the application direction of the translational acceleration Fy is determined to be from the + Y-axis direction. Thus, the above steps are repeated.

According to the seismometer described above, the detection and discrimination of the translational acceleration is simple, but the detection and discrimination of the rotational angular acceleration are complicated because the single optical fiber grating is provided. Not easily sought. But,
According to the seismometer described below, since the optical fiber gratings are arranged in parallel, the translational acceleration and the rotational angular acceleration can be easily obtained separately.

FIGS. 10 to 13 show a second embodiment of the seismometer according to the present invention, which can easily detect the translational acceleration K in three directions, horizontal and vertical, as well as the rotational angular acceleration ω in three directions. FIG. 10 is a perspective view of the seismograph 40 shown in FIG. 13 in which a lid (not shown) for closing both openings in the Y direction of the casing 41 shown by a dotted line is removed, and the inside thereof is seen through, FIG. 11 is a perspective view of the casing 41 seen from the arrow H direction (Z-axis direction), FIG. 11 is a perspective view of the casing 41 seen from the arrow J direction (X-axis direction), and FIG. FIG. 13 is a view of the casing 41 seen through from the direction of the arrow G (Y-axis direction) through the casing 41. FIG. 13 shows the seismograph 4 seen through the casing 2 indicated by the dotted line.
FIG.

As shown in FIG. 13, a casing 41 of the seismometer 40 fixed to a support base (not shown) has a hollow hexahedral shape, and has a hexahedral solid load member 42 inside the casing 41. With its center point located at the center point of the casing 41 (the coordinate origin of the XYZ axes), and with the inner surface of the casing 41 interposed at regular intervals so as to be displaceable in the XYZ directions as follows, Supported.

Referring to FIG. 10 as well, the optical fiber gratings (+ X1), (X1) and (X1) facing the center of the side surface in the + X axis direction of the solid load body 42 orthogonal to the X axis and the side surface in the + X axis direction. + X2) is connected to the center of the end face of each of the support wires 48B and 49B having rigidity, for example, made of steel, and is connected to the + X axis of the optical fiber gratings (+ X1) and (+ X2). The center of the tension adjusting members H, H, which are fixedly displaced at equal intervals, for example, at equal intervals in the ± Y-axis direction with respect to the center portion of the end face in the direction and the orthogonal point orthogonal to the + X axis on the inner surface of the casing 41. Position k5, k
6 is connected to the optical fiber gratings (+ X1), (+ X1
2) is stretched and supported so as to form a V-shape (isosceles triangle) in the XY plane.

Furthermore, optical fiber gratings (-X
3), the center of the end face of (−X4) is
1B, the ends of the optical fiber gratings (−X3) and (−X4) are perpendicular to the −X axis of the center of the end surface in the −X axis direction and the inner surface of the casing 41. The center positions k7, k8 of the tension adjusting members H, H fixed at equal intervals in the ± Y-axis direction with the orthogonal point interposed therebetween are connected by support lines 50A, 51A, thereby providing an optical fiber grating (− X3), (-X4) is replaced by X
It is stretched and supported to form a V-shape (isosceles triangle) in the Y plane.

Referring also to FIG. 11, an optical fiber grating (+ Y1) arranged in parallel with the center of the side surface in the + Y axis direction of the solid load body 42 orthogonal to the Y axis and facing the side surface in the + Y axis direction. , (+ Y2) and the ends of the supporting wires 52B and 53B are united, and the optical fiber gratings (+ Y1), (+ Y2)
2) The centers of the tension adjusting members H, H fixedly displaced at equal intervals in the ± Z-axis direction with respect to the center of the end surface in the + Y-axis direction and the inner surface of the casing 41 at an orthogonal point perpendicular to the + Y-axis. By connecting the points k9 and k10 with the support lines 52A and 52A, the optical fiber grating (+ Y1),
(+ Y2) is stretched and supported so as to form a V-shape (isosceles triangle) on the ZY plane.

Further, the solid load member 42 perpendicular to the Y axis
Optical fiber gratings (-Y) arranged side by side facing the center of the side surface in the Y-axis direction and the side surface in the -Y axis direction.
3), the center of the end face of (-Y4) is
The ends of the optical fiber gratings (−Y3) and (−Y4) are orthogonal to the −Y axis of the center of the end surface in the −Y axis direction and the inner surface of the casing 41. The center points k11 and k12 of the tension adjusting members H, H which are fixed at equal intervals in the ± Z-axis direction with the orthogonal point
Are connected by support wires 54A and 55A,
The optical fiber gratings (-Y3) and (-Y4) are stretched and supported so as to form a V-shape (isosceles triangle) in the ZY plane. Next, referring to FIG. 12, + Z of the solid load body 42 orthogonal to the Z axis of the load body 42
The side-by-side optical fiber gratings (+ Z1) and (+
Z2) and the center of the end faces of the optical fiber gratings (+ Z1) and (+ Z2) in the + Z-axis direction, and the casing 41. The center lines k1 and k2 of the tension adjusting members H, H fixed at equal intervals in the ± X-axis direction across an orthogonal point orthogonal to the + Z-axis on the inner surface of
By connecting the optical fiber gratings (+ Z1) and (+ Z2) by A and 45A, the optical fiber gratings (+ Z1) are stretched and supported so as to form a V-shape (isosceles triangle) in the ZX plane.

Further, the solid load member 42 perpendicular to the Z axis
Optical fiber gratings (-Z
3), the center of the end face of (-Z4) is
The ends of the optical fiber gratings (-Z3) and (-Z4) are orthogonal to the center of the end surface of the optical fiber gratings (-Z3) and (-Z4) in the -Z-axis direction and the Z-axis of the inner surface of the casing 41. By connecting the center points k3 and k4 of the tension adjusting members H and H fixed at equal intervals in the ± X-axis direction with the orthogonal points interposed therebetween by support lines 46A and 47A, an optical fiber grating (− Z3) and (-Z4) as ZX
It is stretched and supported so as to form a V-shape (an isosceles triangle) in a plane.

Also in this case, a clamp mechanism similar to the solid load body clamp mechanism 300 shown in FIG.
Of course, it is provided for 2.

FIG. 14 shows an example of a measurement block diagram of a seismograph.
Laser light generation that forms part of the seismometer 40
The following components are provided in the wavelength measuring unit 60.
You. That is, an outer casing that houses both the feeder and the optical fiber.
Observation station (not shown) installed at a remote point via cable 70
Wavelength λ based on the command signal transmitted from₁, Λ_Two, Λ
_Three, Λ_Four, Λ_Five, Λ₆, Λ₇, Λ₈, Λ₉, Λ_Ten,
λ₁₁, Λ₁₂Excitation and emission of the laser beam 61 having
Laser light source 62, which prevents reflected light from being incident on the emission side.
While stopping the laser light from the laser light source 62.
An isolator 64 that is mounted on an optical fiber 63 and emitted;
Sends outgoing light from isolator 64 to optical coupler 65
I do.

The optical coupler 65 converts the laser light of wavelengths λ _{1 to} λ ₁₂ into optical fiber gratings (+ X1), (+ X2), (−X3), (−X4) connected in series.
And the optical fiber grating (+ Y1), (+ Y
2), (-Y3), (-Y4) and optical fiber gratings (+ Z1), (+ Z2), (-Z3), (-Z
4) and in towards and sending each of the optical fiber grating (+ X1) is the wavelength lambda _1, the (+ X2) is lambda _2, (- X
3) captures a laser beam of λ ₃ , (−X 4) captures a laser beam of λ ₄ , and the optical fiber grating (+ Y 1) has a wavelength of λ ₅ , (+ Y 2) has a wavelength of λ ₆ , and (−Y 3) has a wavelength of λ ₇ . ,
(−Y4) reflects the laser light of λ ₈ , respectively, and the optical fiber grating (+ Z1) has the wavelength of λ ₉ , (+ Z
2) is lambda _10, (- of Z3) is λ _11, (- Z4) is lambda ₁₂
, Respectively.

These optical fiber gratings (+ X
1), (+ X2), (−X3), (−X4), optical fiber
Ba grating (+ Y1), (+ Y2), (-Y
3), (-Y4), and optical fiber grating
(+ Z1), (+ Z2), (-Z3), (-Z4)
When a load force is applied, each of them has a ratio proportional to the load force.
Wavelength displacement reflected laser beam λ with bell_1i, Λ_2i, Λ_3i, Λ
_4i, Λ_5i, Λ_6i, Λ_7i, Λ _8i, Λ_9i, Λ_10i, Λ_11i,
λ_12iAre reflected toward the optical coupler 65, respectively.

The optical coupler 65 sequentially takes in the reflected wavelength output laser beams λ _{1i to} λ _12i, and sequentially enters the wavelength measuring device 69 including, for example, a Fabry-Perot wavelength meter via the optical fiber 67. The wavelength is measured, photoelectrically converted to an electric level signal proportional to the applied load force, code-converted, for example, placed on a carrier wave of frequency FK, and transmitted to the data processing device of the observation station via the outer cable 70.

Next, FIG. 15 shows an example of a circuit block diagram of the wavelength measuring device 69. The wavelength displacement reflected laser beam λ _1i having a level proportional to the applied load force is incident, and the photoelectric conversion signal λ _{1i is obtained.} Only the circuit block of the wavelength measurement unit that sends out the signal is schematically shown, and the circuit blocks of the other wavelength measurement units having the same configuration as this circuit block are omitted and shown as simple blocks. In this FIG.
Gratings (+ X1), (+ X2), (-X3),
The reflected wavelength output light λ _1i , λ _2i , λ _3i having a level proportional to the stretching force corresponding to the applied acceleration emitted from (−X4).
λ _4i , optical fiber grating (+ Y1), (+
Y2), (−Y3), and similar reflected wavelength output lights λ _5i , λ _6i , λ _7i , λ _{8i from} (−Y4), and optical fiber gratings (+ Z1), (+ Z2), (−Z3), (-Z
4) Similar reflected wavelength output light λ _9i , λ _10i ,
[lambda] _11i and [lambda] _12i are incident on the wavelength meter via wavelength filters that respectively filter the respective bands including the wavelengths [lambda] _{1i to} [lambda] _12i . Then, a reflected wavelength output signal having a level proportional to the applied load force from each wavelength meter is incident on the data transmission unit, photoelectrically converted into a level signal, sign-converted, and λ _ji and a change Δλ.
_ji (j = 1, 2,..., 12) is transmitted to the data processing device 75 of the observation station via the transmission cable 70.

Incidentally, also in the second embodiment,
The reflected wavelength output signal λ at a level proportional to the applied stretching force
_ji and the reflected wavelength output signal λ _ji ⁽⁰⁾ (j = 1, 2,...
The change signal described later is represented by Δλ _ji ⁽⁰⁾ (j = 1, 2,.
..12) is expressed as Δλ _ji = λ _ji −λ _ji ⁽⁰⁾ (j =
1, 2,... 12).

The function block of the data processing device 75 shown in FIG.
The function will be described with reference to a lock diagram.
Are optical fiber gratings (+ X1), (+ X
2) Corresponds to the applied acceleration from (-X3) and (-X4)
Wavelength output signal λ having a level proportional to the expanding and contracting force
_1i, Λ_2i, Λ_3i, Λ_4iAnd optical fiber grating
(+ Y1), (+ Y2), (-Y3), (-Y4)
Output signal λ_5i, Λ_6i, Λ_7i, Λ_8iAnd optical fiber
Gratings (+ Z1), (+ Z2), (-Z3),
(−Z4) similar output signal λ_9i, Λ_10i, Λ_11i, Λ
_12iAnd store it in memory.
The reflected wavelength output signal λ during quiet time stored in _ji ⁽⁰⁾(J =
1, 2,..., 12)
_ji ⁽⁰⁾(J = 1, 2,... 12) are also stored in the memory.
And then send the measured data calculated as follows
I do. [1] Calculation and determination of translational acceleration (1) As shown in FIG. 10, applied from the −X axis direction
X component translational acceleration for calculating the translational acceleration Kx calculation data
The calculator 752 calculates the change Δλ called from the memory._1i
And Δλ_2i, And the change Δλ_3iAnd Δλ_4iUsing light
Fiber gratings (+ X1) and (+ X2)
Change in reflected wavelength output signal Δλ_1iAnd Δλ _2iAddition value of
And "optical fiber grating (-X3) and (-
X4) the change Δλ of the reflected wavelength output signal_3iAnd Δλ_4iof
The polarity signal obtained from the difference from the "added value" and its magnitude
A signal fx is output. (2) As shown in FIG. 11, the voltage is applied from the −Y axis direction
Translational addition of Y component for obtaining data for calculating translational acceleration Ky
The speed calculator 753 calculates the change Δ
λ_5iAnd Δλ_6iAnd the change Δλ_7iAnd Δλ_8iWith
"Optical fiber gratings (+ Y1) and (+ Y
2) Change Δλ of the reflected wavelength output signal_5iAnd Δλ_6iAddition
Calculation "and" Optical fiber grating (-Y3) "
And change in reflected wavelength output signal Δλ of (−Y4)_7iAnd Δ
λ_8iThe polarity signal obtained from the difference between the
A signal fy indicating the magnitude is output. (3) Translation applied in the Z-axis direction as shown in FIG.
Translational acceleration of Z component for obtaining data for calculating acceleration Kz
The degree calculator 754 calculates the change Δλ called from the memory.
_9iAnd Δλ_TenAnd the change Δλ_11iAnd Δλ_12iWith
"Optical fiber grating (+ Z1) and (+ Z
2) Change Δλ of the reflected wavelength output signal_9iAnd Δλ_TenAddition
Calculation "and" Optical fiber grating (-Z3)
And the change in the reflected wavelength output signal Δλ of (−Z4)_11ias well as
Δλ_12iAnd the polarity signal obtained from the difference between the
And outputs a signal fz indicating the magnitude and magnitude. (4) Next, the translational acceleration determination unit 758 performs the following:
Is determined. In the X component translational acceleration calculation unit 752,
The calculated "optical fiber grating (+ X1) and
(+ X2) change in reflected wavelength output signal Δλ_1iAnd Δλ
_2iAnd the optical fiber grating (-X
3) and the change Δλ of the reflected wavelength output signal of (−X4)_3i
And Δλ_4iPolarity and magnitude calculated from the difference between the
Therefore, the size of the X-axis direction
A judgment indicating whether the forward acceleration Kx has been applied and the magnitude thereof
Outputs constant data. In the Y component translational acceleration calculation unit 753, as described above,
Fiber grating (+ Y1) and
And the change in the reflected wavelength output signal Δλ of (+ Y2)_5iAnd Δ
λ_6iAnd the optical fiber grating (-
Y3) and (−Y4) reflected wavelength output signal change Δλ
_7iAnd Δλ_8iAnd the polarity calculated from the difference between
The translational acceleration Ky from any of the Y-axis directions
Outputs judgment data indicating whether the voltage was applied and its magnitude
I do. In the Z component translational acceleration calculation unit 754, as described above,
Fiber grating (+ Z1) and
And the change in the reflected wavelength output signal Δλ of (+ Z2)_9iAnd Δ
λ_TenAnd the optical fiber grating (-
Z3) and (−Z4) reflected wavelength output signal change Δλ
_11i, And Δλ_12iThe pole calculated from the difference between the
Horizontal load force from any Z axis direction
Judgment data indicating whether Kz has been applied and its magnitude
Is output. [2] Calculation and determination of rotation angular acceleration (1) Clockwise rotation around + Z axis as shown in FIG.
Rotation angular acceleration ω_XY(Ω _Z) Is applied, ω_XY
In the rotation angular acceleration calculation section 755, the + X component calculation section 7
In 55A, optical fiber gray called from memory
(+ X1) and (+ X2)
Change Δλ_1iAnd Δλ_2iFrom the rotational angular acceleration ω_XYIs Z
Applied from clockwise around the axis or marked from counterclockwise
Polarity signal indicating whether the rotation has been applied and the rotational angular acceleration ω_XYThe size of
Signal indicating the_{XY (12)}], And the -X component calculation unit
In the case of 755B, the optical fiber grating
Of the reflected wavelength output signals of the (-X3) and (-X4)
Compound Δλ_3iAnd Δλ_4iFrom the rotational angular acceleration ω_XYIs the Z axis
Indicates whether the clock was applied clockwise or counterclockwise.
Polarity signal and rotational angular acceleration ω_XYSignal indicating the magnitude of
[Ω_{XY (34)}] Is output. And these signals,
Each is stored in the memory.

Note that the rotational angular acceleration ω_XYOnly applied
In the case, the optical fiber grating (+ X1) and
(−X3) has the same compression force, (+ X2) and (−X
Since the same extension force is applied to 4), the + X component calculation unit
755A and −X component calculating section 755B output the same polarity signal.
Rotation angular acceleration ω having the same magnitude as_XYSignal is output
It is. Therefore, the rotational angular acceleration ω_XYOnly when applied
If_{XY (12)}] = [Ω _{XY (34)}]. But the real
In general, the translational acceleration and the rotational angular acceleration
Since it overlaps with random noise, [ω_{XY (12)}] ≠
[Ω_{XY (34)}]. (2) Clockwise direction around + X axis as shown in FIG.
Rotation angular acceleration ω_YZ(Ω _X) Is applied, ω_YZ
In the + Y component calculation unit 756A of the rotation angular acceleration calculation unit 756,
Are the optical fiber gratings (+ Y1) and (+ Y
2) Change Δλ of the reflected wavelength output signal_5iAnd Δλ_6iThe difference between
And its magnitude, and calculate the -Y component.
In the section 756B, the optical fiber grating (-Y
3), change Δλ of the reflected wavelength output signal of (−Y4)_7i,
Δλ_8iCalculate the polarity signal and its magnitude from the difference
Then, each is stored in the memory.

Note that the rotational angular acceleration ω_YZOnly applied
In this case, the optical fiber grating (+ Y1) and (−
Y3) has the same compression force, while (+ Y2) and (-Y4)
Since the same extension force is applied, the + Y component calculation unit 756
A and −Y component calculation section 756B output the same polarity signal and the same
Angular acceleration ω with the same magnitude_YZA signal is output.
Therefore, the rotational angular acceleration ω_YZOnly applied
[Ω_YZ(12)] = [ω _YZ(34)]. But,
In actual earthquake motion, translational acceleration and rotational angular acceleration are generally
Overlaps with random noise, so [ω_YZ(1
2)] ≠ [ω_YZ(34)]. (3) As shown in FIG. 12, clockwise rotation around the −Y axis
Rotation angular acceleration ω_ZX(Ω _Y) Is applied, ω_ZXrotation
In the + Z component calculation unit 757A of the angular acceleration calculation unit 757,
Optical fiber grating called from memory (+
Z1) and (+ Z2) the change Δλ of the reflected wavelength output signal._9i
And Δλ_10iFrom the difference, the polarity and its magnitude are found,
In the -Z component calculation unit 757B, the optical fiber
Reflection wavelength output of gratings (-Z3) and (-Z4)
Signal change Δλ_11iAnd Δλ_12iFrom the polarity signal
Find the number and size and store them in memory.

Note that the rotational angular acceleration ω_ZXOnly applied
In this case, the optical fiber grating (+ Z1) and (−
Z3) has the same compression force, while (+ Z2) and (-Z4)
Since the same extension force is applied, the + Z component calculation unit 757
A and −Z component calculation section 757B output the same polarity signal and the same signal.
Angular acceleration ω with the same magnitude_ZXA signal is output.
Therefore, the rotational angular acceleration ω_ZXOnly applied
[Ω_ZX(12)] = [ω _ZX(34)]. But,
In actual earthquake motion, translational acceleration and rotational angular acceleration are generally
Overlaps with random noise, so [ω_ZX(1
2)] ≠ [ω_ZX(34)]. (4) Next, the rotational angular acceleration determination unit 759 performs the following.
Judge. + X component calculation unit 755A calculates the optical signal
Reflection of fiber grating (+ X1) and (+ X2)
Wavelength output signal change Δλ_1iAnd Δλ_2iPole obtained from the difference between
The rotation applied to the load body 42 is determined from the sex signal and its magnitude.
Angular acceleration ω_XYJudgment data indicating the direction of application of
Output data. As described above, the −X component calculation unit
755B optical fiber grating (-X3)
The change Δλ of the reflected wavelength output signal of (−X4)_3iAnd Δλ_4i
From the polarity signal and magnitude obtained from the difference between
Constant data is obtained. Further, in the + Y component calculation unit 756A, the optical fiber
Reflection wavelength output of gratings (+ Y1) and (+ Y2)
Signal change Δλ_5iAnd Δλ_6iThe polarity signal obtained from the difference between
Rotation angle acceleration ω_YZDirection of application and its
The discrimination data indicating the size is output. Similarly, -Y component calculation
At the outlet 756B, the optical fiber grating (-X
3) and the change Δλ of the reflected wavelength output signal of (−X4)_3iWhen
Δλ_4iFrom the polarity signal and magnitude found from the difference between
Can be obtained. + Z component calculation unit 757A uses optical fiber
Of the reflected wavelength output signals of the (+ Z1) and (+ Z2)
Compound Δλ_9iAnd Δλ_10iAnd the polarity signal obtained from the difference between
From the magnitude, the rotational angular acceleration ω_ZXDirection and magnitude of
Output the discrimination data shown. Similarly, the −Z component calculation unit 7
57B, with optical fiber grating (-Z3)
The change Δλ of the reflected wavelength output signal of (−Z4)_11iAnd Δ
λ_12iFrom the polarity signal and magnitude found from the difference between
Measurement data can be obtained.

The operation of the seismometer 40 configured as described above will be described with reference to the flowchart shown in FIG.
Based on the command signal from the observation station, the laser light source 62
A laser beam 61 having wavelengths λ _{1 to} λ ₁₂ is
4 to the optical coupler 65. Optical coupler 65
Transmits the laser beam 65 to the optical fiber gratings connected in series, and the optical fiber gratings (+ X1), (+ X2), (-X3), and (-X4) have wavelengths λ ₁ , λ ₂ , λ ₃ and λ ₄ , respectively, and the optical fiber gratings (+ Y1), (+ Y2), (−Y
3) and (−Y4) capture the wavelengths λ ₅ , λ ₆ , λ ₇ and λ ₈ respectively, and the optical fiber gratings (+ Z1), (+ Z2), (−Z3) and (−Z4) ₉ , λ ₁₀ , λ ₁₁ , and λ ₁₂ are captured.

Then, the translational load force K applied to the seismometer casing 41 in the manner described later, and the rotational angular acceleration ω
The reflected wavelength output signal λ _ji having a level proportional to
1, 2,... 12) are, in other words, the reflected wavelength output signals λ from the twelve quiet optical fiber gratings.
_ji ⁽⁰⁾ (j = 1, 2,..., 12), respectively, the applied translational load K and the change signal Δλ due to the rotational angular acceleration ω.
_The reflected wavelength output signal to which _{1i to} Δλ _12i has been added is transmitted to the wavelength measuring device 69 via the optical fiber 66, the optical coupler 65, and the optical fiber 67, and the wavelength is measured, photoelectrically converted to an electric level, and further encoded. Converted signal is armored cable 7
The data is transferred to the data processing device 75 via the “0”. In the detection unit 751, the wavelength output signal λ _ji (j = 1, 2,...)
.. 12) and the wavelength displacement signal λ _ji ⁽⁰⁾ (j = 1, 2,..., 12) at a quiet time previously stored in the memory to determine the change Δλ _{1i to} Δλ _12i , (Step S11).

Next, the translational acceleration K and the rotational angular acceleration ω
The calculation and determination of the application direction and magnitude of
You. (1) When Only Translational Acceleration Kx in the X-Axis Direction is Applied As shown in FIG.
Only the translational acceleration Kx is applied to the actuator 41 from the -X axis direction.
Then, the load body 42 is relatively displaced in the −X axis direction,
Optical fiber grating (+ Y1), (+ Y2),
(-Y3) and (-Y4) and each optical fiber gray
Ting (+ Z1), (+ Z2), (-Z3), and
Since the same amount of displacement is applied to each (−Z4), Y
In the component translational acceleration calculation unit 753, it is called from the memory.
Change Δλ_5iAnd Δλ_6i, And the change Δλ_7iAnd Δλ_8iConversion
Using the optical fiber grating (+ Y1)
And the change in the reflected wavelength output signal Δλ of (+ Y2)_5iAnd Δλ
_6iAnd “optical fiber grating (−Y
Changes Δλ in the reflected wavelength output signals of 3) and (−Y4) _7i
And Δλ_8iCalculated value 0 of the difference from the “added value of
Is output as zero (step S13).
In the Z-component translational acceleration calculation unit 754, similarly,
Called change Δλ_9iAnd Δλ_10i, And the change Δλ
_11iAnd Δλ_12iUsing an optical fiber grating
(+ Z1) and (+ Z2) change in reflected wavelength output signal
Δλ_9iAnd Δλ_10iOf optical fiber and gray
(-Z3) and (-Z4) reflected wavelength output signals
Change Δλ_11iAnd Δλ_12iCalculated value of the difference from
0, that is, information that the fz component is zero (step
Step S14).

However, the optical fiber grating (+
X1) and (+ X2) have the same compressive force, and the optical fiber gratings (-X3) and (-X4) have the same elongation force. Therefore, the optical fiber gratings (+ X1) and (+ X2) Is the reflected wavelength output signal λ _1i , where the grating pitch is reduced in accordance with the compressive force and the wavelength is _shifted ,
λ _2i is output and the optical fiber grating (−X
3) and (−X4) output reflected wavelength output signals λ _3i , λ _{4i that} are larger than the signals λ _1i , λ _2i , the grating pitch is increased corresponding to the elongation force, and the wavelength is displaced. .

Therefore, the X component translational acceleration calculation section 752 uses the changes Δλ _1i , Δλ _2i and the changes Δλ _3i , Δλ _4i called from the memory to _obtain “the change Δλ _1i , Δλ 1 of the reflected wavelength output signal. _2i , the polarity obtained from the difference between the added value of the reflected wavelength output signal Δλ _3i , the added value of Δλ _4i , and the magnitude of the polarity, the direction in which the translational acceleration Kx is applied to the X-axis, The determination data of the fx component indicating the size is output (step S12).

In the translational acceleration determination section 758, the data calculated by the Y-component translational acceleration calculation section 753 and the Z-component translational acceleration calculation section 754 are both 0, and the X-component translational acceleration calculation section 7
52, the change amounts Δλ _1i and Δλ _{2i of the} reflected wavelength output signal.
Of the reflected wavelength output signal Δλ _3i , Δ
Since the calculated data indicating the polarity obtained from the difference from the “added value of λ _4i ” and the magnitude thereof are obtained, the translational load force Kx
Is applied from which axis direction of the X axis, and outputs determination data indicating the magnitude of the translational load force Kx (step S15).

On the other hand, the translations (1) to (3) of [1] have already been performed.
As described in the description of acceleration calculation, ω_XYRotational angle acceleration
Degree calculation unit 755, ω_XYRotation angular acceleration calculation unit 756, and
ω_XYIn the rotation angular acceleration calculation unit 757, (+ X
1) and the calculated value of the difference between (+ X2), (-X3) and (-
X4) is calculated, and (+ Y1) and (+
Y2), the difference between (−Y3) and (−Y4)
Find the calculated value and calculate the difference between (+ Z1) and (+ Z2)
And the calculated value of the difference between (−Z3) and (−Z4) are calculated.
Therefore, the rotational acceleration calculation units 755, 756, 757
Output a 0 signal.
759 does not output any determination signal. (2) In the case of applying only the translational acceleration Ky in the Y-axis direction: As shown in FIG.
When only the translational acceleration Ky is applied from the axial direction, the load
42 are relatively displaced in the −Y axis direction, and each optical fiber
Gratings (+ X1), (+ X2), (-X3),
And (−X4) and each optical fiber grating (+
Z1), (+ Z2), (-Z3), and (-Z4)
X component translational acceleration to apply the same amount of displacement
From the calculation unit 752, the change Δλ called from the memory
_1iAnd Δλ_2i, And the change Δλ_3iAnd Δλ_4iUsing the
Output of fiber gratings (+ X1) and (+ X2)
Force signal change Δλ_1iAnd Δλ_2iOf the optical fiber
Reflection of iva gratings (-X3) and (-X4)
Wavelength output signal change Δλ_3iAnd Δλ_4iThe difference between
Is output, that is, information that the fx component is zero.
(Step S12) Also, the Z-component translational acceleration calculator 7
From 54, the change Δλ called from the memory_9iAnd Δλ
_10i, And the change Δλ_11iAnd Δλ_12iUsing the
Reflection of iva gratings (+ Z1) and (+ Z2)
Wavelength output signal change Δλ_9iAnd Δλ_{Ten i}Addition of "
"Optical fiber grating (-Z3) and (-Z
Output signal change Δλ of 4)_11iAnd Δλ_12iAddition value of
The calculated value 0 of the difference from, that is, information that the fz component is zero
Output (Step S14).

However, the optical fiber grating (+
Y1) and (+ Y2) have the same compressive force, and the optical fiber gratings (-Y3) and (-Y4) have the same expansion force. Represents the change Δλ _5i and Δλ _{6i of} the reflected wavelength output signal whose wavelength is displaced in response to the compressive force, and outputs the above signal from the optical fiber gratings (−Y3) and (−Y4). _Are larger than the conversion amounts Δλ _3i and Δλ _4i , the grating pitch is increased according to the elongation force, and the change amounts Δλ _5i and Δλ _{6i of} the reflected wavelength output signal whose wavelength is displaced are output.

Therefore, the Y component translational acceleration calculating section 753 calculates the difference between the added value of the change Δλ _5i and Δλ _6i of the reflected wavelength output signal and the added value of the change Δλ _7i and Δλ _8i of the reflected wavelength output signal. From the polarity obtained from the above and the magnitude, the fy component determination data indicating the direction of application of the translational acceleration Ky on the Y-axis and the magnitude is output (step S13).

In the translational acceleration judging section 758, the data calculated by the X component translational acceleration calculating section 752 and the calculation data of the Z component translational acceleration calculating section 754 are both 0, and the Y component translational acceleration calculating section 7
Calculation showing the polarity and magnitude of the polarity obtained from the difference between the sum of the changes Δλ _5i and Δλ _6i of the reflected wavelength output signal from 53 and the sum of the changes Δλ _7i and Δλ _8i of the reflected wavelength output signal. Since the data has been obtained, the translation load force Ky is applied from which direction on the Y axis, and the determination data indicating the magnitude of the translation load force Ky is output (step S15).

Also in this case, for the same reason as described in the description of the calculation of the X-axis translational acceleration Kx, the ω _XY rotation angular acceleration calculation unit 755, the ω _XY rotation angular acceleration calculation unit 756, and the ω _XY rotation angular acceleration calculation unit 757 Outputs a 0 signal, no rotation determination signal is output from the rotational angular acceleration determination unit 759. (3) When Only the Translational Acceleration Kz in the Z-Axis Direction is Applied As shown in FIG.
When only the translational acceleration Kz is applied from the Z-axis direction, the load body 42 is relatively displaced toward the + Z-axis direction, and the optical fiber gratings (+ X1), (+ X2), (−X
3) and (−X4), and each of the optical fiber gratings (+ Y1), (+ Y2), (−Y3), and (−Y
In order to apply the same amount of displacement to 4), the X component translational acceleration calculation unit 752 uses the changes Δλ _1i and Δλ _2i and the changes Δλ _3i and Δλ _4i called from the memory.
"Optical fiber gratings (+ X1) and (+ X
2) the sum of the changes Δλ _1i and Δλ _2i of the reflected wavelength output signals ”and“ the changes Δλ _3i and Δλ _4i of the reflected wavelength output signals of the optical fiber gratings (−X3) and (−X4) ”.
, The information that the fx component is zero is output (step S12), and the Y component translational acceleration calculation unit 753 similarly calculates the changes Δλ _5i and Δλ from the memory. _6i and the changes Δλ _7i and Δλ _8i ,
"Optical fiber gratings (+ Y1) and (+ Y
2) Addition value of change Δλ _5i and Δλ _6i of reflected wavelength output signal ”and“ Changes Δλ _7i and Δλ _8i of reflected wavelength output signal of optical fiber gratings (−Y3) and (−Y4) ”.
The calculated value of the difference from the “added value of 0”, that is, information that the fy component is zero is output (step S14).

However, the optical fiber grating (+
Z1) and (+ Z2) receive the same compression force, and the same expansion force is applied to the optical fiber gratings (-Z3) and (-Z4). Therefore, the optical fiber gratings (+ Z1) and (+ Z2) Represents the change Δλ _9i and Δλ _{10i of} the reflected wavelength output signal whose wavelength is displaced due to the decrease in the grating pitch corresponding to the compressive force. The reflected light is output from the optical fiber gratings (−Z3) and (−Z4). The changes Δλ _9i and Δλ _{10i of the} wavelength output signal are larger than those of the wavelengths, the grating pitch increases in accordance with the elongation force, and the changes Δλ _11i and Δλ _{12i of} the reflected wavelength output signal displaced by the wavelength are output.

Therefore, the Z-component translational acceleration calculator 754
Et al., “Change Δλ in reflected wavelength output signal._9i, Δλ_10iof
Addition value "and" reflected wavelength output signal change Δλ_11i, Δ
λ_{12 i}And the magnitude calculated from the difference between the
And the direction of application of the translational acceleration Kz on the Z axis, and
The determination data of the fz component indicating the size is output (step
Step S14).

The translational acceleration determining unit 758 determines that the X component
The acceleration calculation unit 752 and the Y-component translational acceleration calculation unit 753
The calculated data are both 0, and the Z-component translational acceleration calculation unit 7
The change Δλ of the output signal from 54_9i, Δλ_10iAddition value of
And the change Δλ of the output signal_{11 i}, Δλ_12iWith the sum of
The polarity obtained from the difference and the calculation data indicating the magnitude are obtained.
Which direction of the translational load force Kz on the Z axis
Is applied to indicate the magnitude of the translational load force Kz.
The judgment data is output (step S15).

Similarly, for the same reason as described in the description of the calculation of the X-axis translational acceleration Kx, the ω _XY rotation angular acceleration calculator 75
5. Since the 0 signal is output from the ω _XY rotation angular acceleration calculation section 756 and the ω _XY rotation angular acceleration calculation section 757, no determination signal is output from the rotation angular acceleration determination section 759.
Then, the translational acceleration determining unit 758 and the rotational angular acceleration determining unit 759 output signals indicating these determination results to a CRT or a printer. (4) When Only Rotational Angular Acceleration ω _XY is Applied As shown in FIG.
When only the rotational angular acceleration ω _XY is applied clockwise about the axis, the relative displacement of the load body 42 in the counterclockwise direction becomes the optical fiber gratings (+ Y1), (+ Y2),
(−Y3) and (−Y4) and the same displacement amount to each of the optical fiber gratings (+ Z1), (+ Z2), (−Z3) and (−Z4).
_{The YZ} rotation angular acceleration calculation unit 756 calculates a 0 signal indicating the difference between the change Δλ _5i and Δλ _6i of the reflected wavelength output signal of the optical fiber gratings (+ Y1) and (+ Y2), and the optical fiber gratings (−Y3) and (−Y3). −Y4), the change Δλ _7i of the reflected wavelength output signal and the 0 signal indicating the difference between Δλ _8i are output (step S17), and the ω _zx rotation angular acceleration calculation unit 757 outputs the optical fiber grating (+
Z1) and (+ Z2) reflected wavelength output signal change Δλ
A 0 signal indicating the difference between _9i and Δλ _10i and a calculated value 0 of the difference between the change Δλ _11i and Δλ _12i of the reflected wavelength output signal of the optical fiber gratings (−Z3) and (−Z4) are output (step S18). ).

However, the optical fiber grating (+
X1) and (-X3) are applied with the same extension force, and the same compression force is applied to the optical fiber gratings (+ X2) and (-X4). Therefore, the optical fiber gratings (+ X2) and (-X4) are applied. ), The grating pitch is reduced in accordance with the compressive force, and the change amounts Δλ _2i and Δλ _{4i of} the reflected wavelength output signal whose wavelength is displaced are output. From the optical fiber grating (+ X1) and (−X3), Signal Δ
The grating pitch is larger than λ _2i and Δλ _4i , and the grating pitch increases in accordance with the elongation force, and the change amounts Δλ _1i and Δλ _{3i of} the reflected wavelength output signal whose wavelength is displaced are output.

For this reason, the ω _XY rotation angular acceleration calculation unit 755
, The rotational angular acceleration ω _XY is applied from the clockwise or counterclockwise direction from the polarity and magnitude obtained from the difference Δλ _1i and Δλ _2i of the change in the reflected wavelength output signal of (+ X1) and (+ X2). Is output, and a signal indicating its magnitude is output. Similarly, (-X3) and (-X4)
From the polarity and magnitude obtained from the difference between the reflected wavelength output signal changes Δλ _3i and Δλ _4i , it is determined whether the rotational angular acceleration ω _XY is applied clockwise or counterclockwise and its magnitude. A signal indicating the same result is output (step S16).

As already described in the description of the translational acceleration calculation in [1] (1) to (3), the X component translational acceleration calculator 752, the Y component translational acceleration calculator 753, and the Z In the component translational acceleration calculation unit 754, (+ X
1) and (+ X2) and (−X3) and (−X
The difference from the added value of 4) is obtained, and (+ Y1) and (+ Y2)
The difference between the sum of (−Y3) and (−Y4) is calculated, and the difference between the sum of (+ Z1) and (+ Z2) and the sum of (−Z3) and (−Z4) is calculated. The X component translational acceleration calculator 752, the Y component translational acceleration calculator 753, and the Z component translational acceleration calculator 7
From 54 0 signal is output, and therefore, of course in the case of only the angular acceleration omega _XY, determination data regarding translational acceleration K from translational acceleration determining unit 758 is not sent.

Then, from the rotational angular acceleration determining section 759,
Is ω_YZRotation angular acceleration calculator 756, ω_ZXRotational angular acceleration
The data calculated by the calculation unit 757 are both 0, and ω_XYAngle of rotation
Change Δλ of output signal from acceleration calculation section 755_1i, Δ
λ_2iOr the change Δλ in the output signal_3i, Δλ_4iThe difference between
Calculated data indicating the polarity and the magnitude
The rotational angular acceleration ω_XYIs clockwise around the X axis
Direction or counterclockwise, and
The determination data indicating the size is output (step S1
9). (5) Rotational angular acceleration ω_YZAs shown in FIG. 11 (FIG. 13), the X-axis of the casing 41
Clockwise rotation angular acceleration ω_YZOnly applied
And the relative displacement of the load body 42 in the counterclockwise direction
Fiber grating (+ X1), (+ X2),
(-X3) and (-X4) and each optical fiber gray
Ting (+ Z1), (+ Z2), (-Z3), and
(−Z4), the same displacement is applied,
_XYIn the rotation angular acceleration calculation unit 755, the optical fiber gray
(+ X1) and (+ X2) reflected wavelength output signals
Change Δλ_1iAnd Δλ_2iSignal indicating the difference between
Reflected waves from ba gratings (-X3) and (-X4)
Variation of long output signal Δλ_3iAnd Δλ _4i0 signal indicating the difference between
Is output (step S16), and ω_ZXRotational angular acceleration
In the calculation unit 757, the optical fiber grating (+ Z
Changes Δλ in the reflected wavelength output signals of 1) and (+ Z2)_9i
And Δλ_10iSignal indicating the difference between
(-Z3) and (-Z4)
Change Δλ_11iAnd Δλ_12iThe calculated value 0 of the difference
(Step S18).

However, the optical fiber grating (+
The same stretching force is applied to both Y1) and (−Y3),
Fiber gratings (+ Y2) and (-Y4)
Since the same compression force is applied to both,
(+ Y2) and (-Y4) correspond to the compression force.
The reflected wavelength output signal λ whose wavelength has been shifted due to the reduced
_10i, Λ_12iIs output and the optical fiber grating
From (+ Y1) and (−Y3), the reflected wavelength output signal
λ_10i, Λ_12iLarger than
Of the reflected wavelength output signal, whose wavelength
Compound Δλ_9i, Δλ _12iIs output.

For this reason, ω _YZ rotation angular acceleration calculation section 756
, The rotational angular acceleration ω _YZ is applied from the clockwise or counterclockwise direction from the polarity and magnitude obtained from the difference Δλ _5i and Δλ _6i of the change in the reflected wavelength output signal of (+ Y1) and (+ Y2). And a reflected wavelength output signal indicating the magnitude and the magnitude of the reflected wavelength. Similarly, the change amounts Δλ _7i and Δλ of the reflected wavelength output signals of (−Y3) and (−Y4)
_From the polarity and magnitude obtained from the difference of _8i , whether the rotational angular acceleration _ωYZ was applied clockwise or counterclockwise,
Then, a signal indicating the same result indicating the magnitude is output (step S17).

The rotation angular acceleration determination section 759 includes a ω _XY rotation angular acceleration calculation section 755 and a ω _ZX rotation angular acceleration calculation section 757.
_Are both 0, and the changes Δλ _5i and Δλ _6i of the reflected wavelength output signal from the ω _YZ rotation angular acceleration calculation unit 756 are
Or the polarity obtained from the difference between the reflected wavelength output signals Δλ _7i and Δλ _8i , and the calculation data indicating the magnitude of the polarity, the rotational angular acceleration ω _YZ becomes clockwise around the Y axis. Or determination data indicating whether the voltage is applied from the counterclockwise direction and the magnitude thereof is output (step S1).
9).

As already described in the description of _{obtaining the} rotational angular acceleration ω _YZ , the X-component translational acceleration calculator 752,
Since the 0 signal is output from each of the Y-component translational acceleration calculation unit 753 and the Z-component translational acceleration calculation unit 754, the determination data regarding the translational acceleration K is not transmitted from the translational acceleration determination unit 758. (6) When Only Rotational Angular Acceleration ωZX in the Z-Axis Direction is _{Applied As} shown in FIG. 12 (FIG. 13), when only the rotational angular acceleration _ωzx is applied clockwise around the Y-axis of the casing 41, the load is The relative displacement of the body 42 in the counterclockwise direction is determined by each of the optical fiber gratings (+ X1), (+ X2),
(−X3) and (−X4) and the same amount of displacement on each of the optical fiber gratings (+ Y1), (+ Y2), (−Y3), and (−Y4).
_{The XY} rotation angular acceleration calculation unit 755 calculates the 0 signal indicating the difference between the reflected wavelength output signals λ _1i and λ _2i of the optical fiber gratings (+ X1) and (+ X2), and the optical fiber gratings (−X3) and (−X4). ) Reflected wavelength output signal λ
_A signal indicating the difference between _3i and λ _4i is output (step S1).
6) In addition, the ω _YZ rotation angular acceleration calculation unit 756 calculates the 0 signal indicating the difference between the reflected wavelength output signals λ _5i and λ _6i of the optical fiber gratings (+ Y1) and (+ Y2), and the optical fiber grating (− The calculated value 0 of the difference between the reflected wavelength output signals λ _7i and λ _8i of Y3) and (−Y4) is output (step S17).

However, the optical fiber grating (+
The same stretching force is applied to both Z1) and (-Z3),
Fiber gratings (+ Z2) and (-Z4)
Since the same compression force is applied to both,
(+ Z2) and (-Z4) correspond to the compression force.
The reflected wavelength output signal λ whose wavelength has been shifted due to the reduced
_10i, Λ_12iIs output and the optical fiber grating
From (+ Z1) and (−Z3), the signal λ_10i, Λ
_12iIs larger than the grid pitch
Increased and wavelength-shifted reflected wavelength output signal λ_9i, Λ_12iBut
Is output. Therefore, ω_ZXRotational angular acceleration calculation unit 757
From the (+ Z1) and (+ Z2) reflected wavelength output signals
Change Δλ_9iAnd Δλ_10iAnd the polarity obtained from the difference
Rotation magnitude acceleration ω_zxIs clockwise or counter-clockwise
Indicates whether the voltage was applied from the measuring direction and its magnitude.
A reflected wavelength output signal is output. Similarly, (-Z3)
And the change Δλ in the reflected wavelength output signal of (−Z4)_11i,
Δλ_12iRotation from the polarity and magnitude determined from the difference
Angular acceleration ω_zxIs applied clockwise or counterclockwise
And a signal showing the same result indicating its magnitude
Is output (step S18).

The rotation angular acceleration determination section 759 includes a ω _XY rotation angular acceleration calculation section 755 and a ω _YZ rotation angular acceleration calculation section 756.
Are both 0, and the changes Δλ _9i and Δλ of the reflected wavelength output signal from the ω _ZX rotation angular acceleration calculation unit 757 are
_10i , or the change in the reflected wavelength output signal Δλ _11i , Δ
Since the polarity obtained from the difference of λ _12i and the calculation data indicating the magnitude thereof have been obtained, whether the Y component rotational angular acceleration ω _zx was applied clockwise around the Y axis or counterclockwise, and , And outputs determination data indicating the size (step S19).

The X component translational acceleration calculator 752, Y
Component translational acceleration calculator 753 and Z component translational acceleration calculator
From the output portion 754, the rotational angular acceleration ω_XYAsk for explanation
As described in the section, the 0 signal is output
Therefore, the translational acceleration determination unit 758 determines that the translational acceleration K is
Is not sent. And the rotational angular acceleration
From the determination unit 759 and the translational acceleration determination unit 758,
Output a signal indicating the determination result to a CRT or a printer. (7) In FIG. 10, optical fiber grating
The difference (X) between (+ X1) and (+ X2)₁₂), (-X3),
(−X4) difference (X₃₄) And the same sign, rotation each acceleration
Degree ω_XYIs determined to have been applied, and (X₁₂) And (X₃₄)
If the sign is different, it is determined that the translational acceleration in the Y direction has been applied,
In FIG. 11, the optical fiber grating (+ Y
1), the difference between (+ Y2) (Y₁₂), (-Y3), (-Y
4) Difference (Y₃₄) And the same sign, the rotational acceleration ω_YZ
Is determined to have been applied, and (Y₁₂) And (Y ₃₄) Is different sign
If it is determined that the translational acceleration in the Z direction is applied,
2, the optical fiber grating (+ Z1),
(+ Z2) difference (Z₁₂) And (-Z3), (-Z4)
Difference (Z₃₄) And the same sign, the rotational acceleration ω_zxIs applied
And (Z₁₂) And (Z₃₄) And the opposite sign,
It can also be determined that translational acceleration in the X direction has been applied
You. (8) Translational acceleration and rotation described in (1) to (6) above
When both angular displacement accelerations are mixed,
Under dynamic conditions, for example, only the aforementioned translational acceleration is measured.
3 components of translational acceleration are removed from the measured earthquake data
After that, find the remaining three components of the rotational angular acceleration
Is also good.

It is to be noted that only the casing 2 (41) used in the first and second embodiments described above may have a spherical shape, or only the load 3 (42) may have a spherical shape. The casing 2 (41) and the load 3 (42) may both have a spherical shape. Also,
The casing (3) shown in FIGS. 2 to 4 and FIGS. 10 to 12 has a casing (3), (42) It is necessary to keep the whole at a uniform temperature. For this reason, the casings (3) and (42) are stored in a thermostat, surrounded by a heat insulating material, or stored and installed in a vacuum container. Further, the shapes of the casing and the load may be a simple hexahedron, an octahedron, or a polyhedron.

In addition, the optical fiber grating elements installed in the casings (3) and (42) are not limited to a single element. With the configuration in which the elements are connected in series, an improvement in the S / N ratio and an improvement in the sensitivity can be expected.

FIG. 18 shows a modification of the present invention.
In the example of the seismometer shown in FIG.
Fiber gratings 4, 6, 8, 10, 12, 1
4 Connect an optical fiber to each end of the transmitted light
Transmitted light absorption spectrometer at each end of these optical fibers
33A to 33F are respectively connected. And from the light source
Laser light 28 incident on each optical fiber grating
Then, as described above, the wave corresponding to the applied stretching force
Long displacement reflected laser beam λ_1i, Λ_2i, Λ_3i, Λ_4i, Λ _5i, Λ
_6iIs reflected. At the same time, transmission through each optical fiber
Light, that is, the absorbed laser beam λ for each wavelength displacement reflected_1i, Λ
_2i, Λ_3i, Λ_4i, Λ_5i, Λ_6iAre the wavelengths
Each transmitted light has a transmitted light absorption spectrum measuring instrument 33A-3
It is incident on 3F. In each transmitted light absorption spectrum measuring instrument,
Reference from built-in reference light spectrum generator not shown
Interference between the light spectrum and the transmitted light spectrum occurs,
Absorption spectrum wavelength, that is, wavelength displacement reflection laser
Light λ_1i, Λ_2i, Λ_3i, Λ_4i, Λ_5i, Λ_6iThe wavelength of each
Specified and emitted. Therefore, optical fiber grating
Wavelength displacement reflection levels from groups 4, 6, 8, 10, 12, 14
Laser light λ_1i, Λ_2i, Λ _3i, Λ_4i, Λ_5i, Λ_6iAnd transmitted light
Expressions from the absorption spectrum measuring instruments 33A to 33F
Measurement wave indicated by simply adding a subscript t for the purpose of easy identification
Long λ_1it, Λ_{2i t}, Λ_3it, Λ_4it, Λ_5it, Λ_6itWhen
Is transferred to the outside via the exterior cable. Therefore, anti
Detection of applied acceleration from two systems: emission data and transmitted light data
It is possible to go out.

Also, in FIG. 14 in which a plurality of optical fiber gratings are connected in series, a transmission light absorption spectrum measuring instrument is connected to the end of the optical fiber in the transmission light propagation direction, as shown in FIG. In the same way as the above, two kinds of applied accelerations of reflected light data and transmitted light data can be detected. Instead of measuring the wavelength, the applied acceleration can be detected by measuring the frequency spectrum. Further, the application of the seismometer of the present invention is not limited to the surface of the earth, but can be installed on rockets, artificial satellites, railways, private cars, and the like, in addition to the sea floor, lake bottom, celestial body surface, and the like.

[0093]

As described above, according to the first and second aspects of the present invention, a space is interposed from each inner surface of a hollow polyhedral casing, and the solid load body having the polyhedral shape is formed as described above. Each center position of the casing and the solid load is XY
It is arranged so as to be located at the coordinate origin of the Z axis, and XY
Optical fiber gratings (+ X), (-X), (+ Y), (-Y) at the center of each inner surface of the casing in the Z-axis direction and at the center of each outer surface of the solid load body.
And (+ Z) and (−Z), and the solid load body is
The optical fiber grating is vertically suspended and supported so as to exert an acceleration on each of the optical fiber gratings by being relatively displaced in accordance with the translational acceleration F applied to the casing. Each of the optical fiber gratings (+ X) and (-X) Based on a signal indicating its polarity and its magnitude calculated from the difference between the reflected wavelength output signals, and from the difference between the reflected wavelength output signals of the optical fiber gratings (+ Y) and (−Y). The polarity and its polarity calculated based on the calculated signal indicating the polarity and its magnitude, and from the difference between the change in the reflected wavelength output signal of the optical fiber grating (+ Z) and that of the optical fiber grating (-Z). Based on the signal indicating the magnitude, the X-axis direction, the Y-axis direction, or Z
Since it is configured to output the discrimination data indicating which magnitude of the translational acceleration is applied from which direction in the axial direction, the translation applied from the X-axis, Y-axis, or Z-axis direction of the casing. The direction of application of the acceleration and the magnitude thereof can be determined separately.

According to the fourth and fifth aspects of the present invention, a solid load body having a polyhedral shape is formed by interposing a space from each inner surface of a hollow polyhedral casing. Each center position of the load body is arranged so as to be located at the coordinate origin of the XYZ axes, and between the center of the outer surface in the ± XYZ axis direction of the solid load body and the inner surface in the ± XYZ axis direction of the casing. And an XY plane, a YZ plane,
An optical fiber grating (+ X1), so as to form six V-shaped shapes with respect to the ZX plane, respectively.
(+ X2), (−X3), (−X4), optical fiber grating (+ Y1), (+ Y2), (−Y
3), (−Y4) and the optical fiber grating (+
Z1), (+ Z2), (-Z3), and (-Z4) are vertically supported, and the optical fiber grating (+ X
1), the polarity obtained from the difference between the added value of the change of each reflected wavelength output signal of (+ X2) and the added value of the change of each reflected wavelength output signal of (-X3) and (-X4); Based on the magnitude, discrimination data indicating from which direction in the X-axis direction the magnitude of the translational acceleration Kx is applied is output, and the reflected wavelength output signals of the optical fiber gratings (+ Y1) and (+ Y2) are output. The added value of the change, (−Y3), (−
Based on the polarity and magnitude obtained from the difference between the added value of the change in each reflected wavelength output signal of Y4) and the direction in the Y-axis direction and the magnitude indicating the magnitude of the translational acceleration Ky applied. Data is output, and the added value of the change of each reflected wavelength output signal of the optical fiber grating (+ Z1) and (+ Z2) and the added value of the change of each reflected wavelength output signal of (−Z3) and (−Z4) are added. From the polarity and magnitude obtained from the difference from the value, the discrimination data indicating from which direction in the Z-axis direction the magnitude of the translational acceleration Kz is applied, and an optical fiber grating (+ X1) , (+ X
2) From the difference of the change of each reflected wavelength output signal, or (−X
3) From the polarity and magnitude obtained from the difference between the reflected wavelength output signals of (−X4), the application direction of the rotational angular acceleration ω _XY applied to the load body around the Z axis, The discrimination data indicating the size is output, and the difference between the reflected wavelength output signals of the optical fiber gratings (+ Y1) and (+ Y2) or the reflected wavelength output signals of (−X3) and (−X4) is output. Of the rotation angular acceleration ω applied to the load body around the X axis from the polarity and magnitude obtained from the difference
_The discrimination data indicating the application direction of _YZ and its size is output, and the optical fiber grating (+ Z1), (+ Z
From the difference of the change of each reflected wavelength output signal of 2), or (−
Z3) and (−Z4), the direction of application of the rotational angular acceleration ω _ZX applied around the Y-axis to the load, and the magnitude thereof, based on the polarity and magnitude of the difference between the reflected wavelength output signals of (−Z4). Is configured to output the discrimination data indicating the direction of application of the translational accelerations fx, fy, and fz applied to the casing, and the discrimination between the direction and the magnitude thereof. The application direction and the magnitude of the rotational angular acceleration applied around the Y axis or the Z axis can be easily obtained and determined.

According to the third and sixth aspects of the present invention, the solid load body in the polyhedral casing is formed in a spherical shape, or the casing is formed in a spherical shape, and the casing is formed in a spherical shape. It is possible to form the solid load body in a polyhedral shape, or to form both the casing and the solid load body in a spherical shape.

According to the seventh aspect of the present invention, since the clamp mechanism for the polyhedral solid load body is provided, the clamp mechanism is locked to the solid load body so that the solid load body can be transported to the installation location. No damage to the optical fiber grating during the process.

According to the eighth and ninth aspects of the invention,
By connecting the transmitted light absorption spectrum measuring instrument to the tip of the optical fiber connected to the tip in the transmitted light direction of the optical fiber grating provided on the laser excitation light emission side, reflected light data and transmitted light can be measured. The applied acceleration can be detected from two systems of optical data.

[Brief description of the drawings]

FIG. 01 is a characteristic graph showing a relationship between acceleration applied to an optical fiber grating and a change in wavelength of light reflected from the optical fiber grating due to axial elongation corresponding to a load force.

FIG. 02 shows a first embodiment of the present invention.
In the perspective view of the seismograph shown in FIG. 05 in which the lids 2A and 2B indicated by dashed lines are removed from the casing 2 indicated by dashed lines and moved in the direction of arrow DE, and the inside thereof is seen through, the arrow A
It is the figure seen from the direction.

FIG. 03 is a view in which the casing 2 is seen through from the direction of arrow B in FIG.

FIG. 04 is a view of the casing 2 seen from the direction of arrow C in FIG.

FIG. 05 is a perspective view of the inside of the seismometer showing the casing 2 and the lids 2A and 2B seen through after removing the lids 2A and 2B from the casing 2.

FIG. 06 illustrates the case where the clamp mechanism penetrates the casing, and is a configuration diagram of the clamp mechanism for a solid load body viewed from the direction of arrow A in FIG.

FIG. 07 is a measurement block diagram of the seismometer of the present invention in which optical fiber gratings are connected in parallel.

FIG. 08 is a circuit block diagram of a wavelength measuring device of the seismometer according to the present invention.

FIG. 9A is a functional block diagram showing functions of the data processing device 35, and FIG. 9B is a flowchart of the data processing device.

FIG. 10 shows a second embodiment of the seismometer of the present invention which enables detection of rotational angular acceleration in three directions in addition to detection of translational acceleration in three directions, horizontal and vertical.
A lid (not shown) for closing both openings in the Y direction of the casing 41 indicated by a dotted line is removed, and a perspective view of the seismometer 40 showing the inside thereof in a see-through manner is seen through the casing 41 in an arrow H direction (Z axis). FIG.

11 is a view in which the seismometer 40 is seen through from the direction of the arrow J (the X-axis direction) seen through the casing 41 in FIG.

FIG. 12 is a view in which the seismometer 40 is seen through from the direction of arrow G (Y-axis direction) through the casing 41 in FIG.

FIG. 13 is a perspective view of the casing 2 indicated by a dotted line.
FIG. 3 is a perspective view of the inside of a seismometer 40.

FIG. 14 is a measurement block diagram of the seismometer in which optical fiber gratings are connected in series.

FIG. 15 is a diagram schematically showing a circuit block diagram of a wavelength measuring device of the seismometer.

FIG. 16 is a functional block diagram of a data processing device.

17 is a flowchart of the data processing device shown in FIG.

FIG. 18 is a block diagram of the seismometer circuit shown in FIG.
FIG. 3 is a schematic configuration diagram of an optical system that detects an applied acceleration from two systems of reflected light data and transmitted light data.

FIG. 19 is a diagram schematically illustrating a conventional seismometer for detecting acceleration in a two-dimensional direction.

FIG. 20 is a diagram schematically showing a conventional water pressure sensor having an optical fiber grating.

[Explanation of symbols]

1 (40): seismometer, 2 (41): casing, 3 (42): solid load body, 4, 6, 8, 10,
12, 14 ... optical fiber grating, X1
X4, Y1 to Y4, Z1 to Z4: Optical fiber grating, 20 (60): Laser light generation / wavelength measurement unit, 28 (61): Laser excitation light, 35 (7)
5) ... data processing device, 300 ... clamp mechanism.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01V 1/18 G01H 9/00 G01P 15/03 G01P 15/18

Claims (9)

(57) [Claims] 1. A solid load body having a polyhedral shape and a center position of each of the XYZ axis and the center of the solid load body being located at intervals from each inner surface of a casing having a hollow polyhedral shape. To be located at
+ X axis direction of the casing in the X axis direction and -X
One end and the other end of the optical fiber grating (+ X) are connected to the center of each inner surface in the axial direction and the center of each outer surface of the solid load body in the + X axis direction and the −X axis direction, respectively. A fixed support wire connected to one end and the other end of the optical fiber grating (-X) is fixed, and the center of each inner surface in the + Y axis direction and the -Y axis direction of the casing in the Y axis direction is fixed. And a support wire connected to one end and the other end of the optical fiber grating (+ Y), respectively, at the center and at the center of each outer surface in the + Y axis direction and the −Y axis direction of the solid load body. A support wire connected to one end and the other end of the grating (-Y) is fixed, and the center of each inner surface of the casing in the + Z axis direction and the -Z axis direction in the Z axis direction, and the solid load. And a support line connected to one end and the other end of the optical fiber grating (+ Z), respectively, at the center of each outer surface in the + Z axis direction and the -Z axis direction, and one end of the optical fiber grating (-Z). And by fixing a support wire connected to the other end, the solid load body is relatively displaced in accordance with the translational acceleration F applied to the casing so as to exert an acceleration on each of the optical fiber gratings. The optical fiber gratings respectively capture the laser excitation light having different wavelengths, and each of the optical fiber gratings is displaced in wavelength from each optical fiber grating based on the relative displacement of the solid load body with respect to the casing. Based on the change in the reflected wavelength output signal, the direction of application of the translational acceleration applied to the casing and the magnitude thereof are determined. Seismograph, characterized by transmitting to the data processing device for outputting to the measurement data. 2. The data processing device according to claim 1, wherein said polarity and magnitude calculated from a difference between a change in each reflected wavelength output signal of said optical fiber grating (+ X) and said optical fiber grating (-X) are indicated. Based on the signal, based on a signal indicating its polarity and its magnitude calculated from the difference between the change of each reflected wavelength output signal of the optical fiber grating (+ Y) and the optical fiber grating (-Y), and Fiber grating (+ Z) and optical fiber grating (-Z)
Based on a signal indicating its polarity and its magnitude calculated from the difference in the change of each reflected wavelength output signal, the magnitude of magnitude from any direction in the X-axis direction, Y-axis direction, or Z-axis direction 2. The seismograph according to claim 1, wherein the determination data indicating that the translational acceleration is applied is output. 3. A solid load body in the polyhedral casing has a spherical shape, or the polyhedral casing has a spherical shape and a solid load body in the casing has a polyhedral shape. Or both the casing and the solid load have a spherical shape.
The seismograph described. 4. A solid load body having a polyhedral shape is separated from each inner side surface of a casing having a hollow polyhedral shape by a space, and the center positions of the casing and the solid load body are coordinate origins of XYZ axes. At the center of the outer surface of the solid load body in the + X-axis direction, and at the inner surface of the casing separated in the ± Y-axis direction across an orthogonal point orthogonal to the + X-axis, By connecting each end of the support wire connected to one end face of each of the optical fiber gratings (+ X1) and (+ X2) and the end of the support wire connected to each other end face, , Which is stretched and supported so as to form a V-shape in the XY plane, the center of the outer surface of the solid load body in the −X-axis direction, and the casing,
A support connected to one end face of one of the optical fiber gratings (-X3) and (-X4) arranged side by side with the inner surface separated in the ± Y-axis direction across an orthogonal point orthogonal to the -X axis. By connecting each end of the wire and each end of the support wire connected to each other end surface, the wire is stretched and supported so as to form a V-shape in the XY plane, The optical fiber gratings (+ Y1), ((Y1), (2) are arranged side by side at the center of the outer surface in the + Y-axis direction and the inner surface of the casing separated in the ± Z-axis direction across an orthogonal point perpendicular to the + Y-axis. + Y2) by connecting each end of the support wire connected to one end face of each of the support wires and each end of the support wire connected to each other end face to form a V-shape in the YZ plane. And the center of the outer surface of the solid load body in the −Y-axis direction, Bedding,
A support connected to one end face of one of the optical fiber gratings (-Y3) and (-Y4) arranged side by side on the inner surface separated in the ± Z axis direction with an orthogonal point orthogonal to the -Y axis interposed therebetween. A portion where the ends of the wire are united and each end of the support wire connected to the other end face are stretched and supported so as to form a V-shape on the YZ plane, and Optical fiber gratings (+ Z1) juxtaposed on the center of the outer surface of the body in the + Z-axis direction and the inner surface of the casing separated in the ± X-axis direction across an orthogonal point orthogonal to the + Z-axis. , (+ Z2), by connecting the ends of the support wires connected to one end face of each of the support wires and the other ends of the support wires connected to the other end faces, the VX in the ZX plane is obtained. The solid load body is stretched and supported so as to form a V-shape. And parts,
± of the above-mentioned casing with respect to an orthogonal point orthogonal to the −Z axis.
A part where each end of a support wire connected to one end face of one of the optical fiber gratings (-Z3) and (-Z4) arranged side by side with the inner side face separated in the X-axis direction. When,
By extending and supporting each end of the support wire connected to the other end face so as to form a V-shape in the ZX plane, the translational acceleration applied to the casing by applying the solid load body to the casing K, or a relative displacement corresponding to the rotational angular acceleration ω, vertically suspended and supported on the casing so as to exert an acceleration on each of the optical fiber gratings, and a laser in which each of the optical fiber gratings has a different wavelength. The excitation light is taken in, the load body is relatively displaced in accordance with the translational acceleration K or the rotational angular acceleration ω applied to the casing, and each reflected wavelength output signal from the optical fiber grating based on the relative displacement. A determination signal indicating the direction of application of the translational acceleration K or the rotational angular acceleration ω applied to the casing based on the change in Seismograph, characterized by transmitting to the data processing apparatus. 5. The data processing device according to claim 1, wherein the optical fiber gratings (+ X1) and (+ X1)
The polarity obtained from the difference between the added value of the change of each reflected wavelength output signal of 2) and the added value of the change of each reflected wavelength output signal of the optical fiber gratings (−X3) and (−X4). Based on the magnitude, the discrimination data indicating from which direction in the X-axis direction the magnitude of the translational acceleration Kx is applied is output, and the optical fiber grating (+ Y1) is output.
And (+ Y2), the sum of the changes of the reflected wavelength output signals, and the optical fiber gratings (-Y3) and (-Y
From the polarity and magnitude obtained from the difference between the added value of the change of each reflected wavelength output signal and the magnitude of the reflected wavelength output signal, the discrimination indicating from which direction in the Y-axis direction and how much the translational acceleration Ky is applied. Data is output, and the added value of the change of each reflected wavelength output signal of the optical fiber gratings (+ Z1) and (+ Z2) and the optical fiber grating (-Z
From 3) and (−Z4), from the polarity and magnitude obtained from the difference between the added value of the change of each reflected wavelength output signal and the magnitude of the translational acceleration Kz from which direction in the Z-axis direction is applied. The discrimination data indicating whether or not the optical fiber grating has been output is output, and the optical fiber grating (+ X1) and (+ X
2) The load is determined from the difference between the changes in the reflected wavelength output signals or from the polarity and magnitude obtained from the difference between the changes in the reflected wavelength output signals of the optical fiber gratings (-X3) and (-X4). It outputs the direction of application of the rotational angular acceleration ω _XY applied to the body about the Z axis and discrimination data indicating the magnitude thereof, and outputs the optical fiber grating (+ Y1) and (+ Y1).
Y2) from the difference between the reflected wavelength output signals, or from the difference and the polarity obtained from the difference between the reflected wavelength output signals of the optical fiber gratings (-X3) and (-X4), from the polarity and magnitude thereof, It outputs the application direction of the rotational angular acceleration ω _YZ applied to the load about the X axis and discrimination data indicating the magnitude thereof, and outputs the respective reflection wavelength output signals of the optical fiber gratings (+ Z1) and (+ Z2). Or the difference between the optical fiber gratings (-Z3) and (-Z4)
From the polarity and magnitude of the difference between the change in the reflection wavelength output signal, and outputs the application direction of the rotational angular acceleration omega _ZX which to load bodies are applied to the Y axis, the discrimination data indicating the magnitude Determining whether or not each of the polarities in the ± X-axis direction, ± Y-axis direction, or ± Z-axis direction and a signal indicating the magnitude thereof are present, and applying the translational acceleration applied to the casing based on the determination result. A discrimination signal indicating the direction and the magnitude thereof, the application direction of the rotational angular acceleration applied around the X axis, the Y axis, or the Z axis applied to the casing, and the presence or absence of the magnitude are determined. 5. The method according to claim 4, further comprising the step of outputting an application direction of the rotational angular acceleration applied around the X-axis, the Y-axis, or the Z-axis of the casing, and a determination signal indicating the magnitude thereof. The seismograph described. 6. The solid load body in the polyhedral casing has a spherical shape, the polyhedral casing has a spherical shape and the solid load body in the casing has a polyhedral shape, Or both the casing and the solid load have a spherical shape.
The seismograph described. 7. Each of the at least one pair of two shafts penetrates a substantially central portion of an axial length of a diagonal edge of the casing from the outside of the casing,
Alternatively, from the position inside the casing and substantially opposite to the central portion of the axial length of the inner diagonal line of the casing, the axial length of the corner edge portion located on the diagonal line of the solid load body is substantially reduced. A cushion member is provided on an engagement surface of the angle member having an L-shaped cross section provided at one end of each of the shaft members, the cushion member being opposed to the corner portion of the solid load body. A worm gear is engraved on the other end of the
A solid load locking mechanism formed by fixedly forming an electric motor that drives a pinion that meshes with the worm gear; and displacing each of the shafts with respect to a corner of the solid load by driving the electric motor; The seismometer according to claim 1 or 4, wherein the engagement surface of the angle member and the corner of the solid load body are locked and disengaged. 8. The optical fiber grating is connected in parallel to a laser excitation light emitting side, and an optical fiber is connected to each end of the optical fiber grating in the transmitted light propagation direction. Each transmitted light absorption spectrum measuring instrument is connected to each tip, and each reflected wavelength output signal whose wavelength is displaced from the optical fiber grating is emitted, and from each transmitted light absorption spectrum measuring instrument, 2. The seismograph according to claim 1, wherein the reflected light data and the transmitted light data are output by emitting each absorption spectrum wavelength that specifies the wavelength of each of the reflected wavelength output signals. 9. The optical fiber grating is connected in series to a laser pumping light emitting side, and an optical fiber is connected to a front end of the optical fiber grating in a transmitted light propagation direction. A transmitted light absorption spectrum measuring instrument is connected, and each reflected wavelength output signal whose wavelength is displaced is emitted from the optical fiber grating. 5. The seismograph according to claim 4, wherein reflected light data and transmitted light data are output by emitting each absorption spectrum wavelength that specifies a signal wavelength.