CN108931809A - Two axis Fibre Optical Sensor earthquake wave detectors - Google Patents
Two axis Fibre Optical Sensor earthquake wave detectors Download PDFInfo
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- CN108931809A CN108931809A CN201810749098.9A CN201810749098A CN108931809A CN 108931809 A CN108931809 A CN 108931809A CN 201810749098 A CN201810749098 A CN 201810749098A CN 108931809 A CN108931809 A CN 108931809A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 21
- 239000013307 optical fiber Substances 0.000 claims abstract description 234
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- 229910001220 stainless steel Inorganic materials 0.000 claims description 13
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- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
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- 238000006243 chemical reaction Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
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- 239000010959 steel Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/16—Receiving elements for seismic signals; Arrangements or adaptations of receiving elements
- G01V1/18—Receiving elements, e.g. seismometer, geophone or torque detectors, for localised single point measurements
- G01V1/181—Geophones
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
- G01H9/006—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors the vibrations causing a variation in the relative position of the end of a fibre and another element
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- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Geophysics And Detection Of Objects (AREA)
Abstract
The invention discloses a kind of two axis Fibre Optical Sensor earthquake wave detectors, it is related to technical field of optical fiber sensing, it includes narrow linewidth laser, X-axis photodetector, Y-axis photodetector, the first three-dB coupler, the second three-dB coupler, third three-dB coupler, the 4th three-dB coupler, the 5th three-dB coupler, it further include mass body, the surrounding of the mass body is connected separately with the first helical annular optical fiber, the second helical annular optical fiber, third helical annular optical fiber and the 4th helical annular optical fiber.The present invention is not only simple in structure, good economy performance, and has and respond the advantages such as fast, highly reliable, advanced prediction, in terms of application prospect it is very wide.
Description
Technical field
The present invention relates to technical field of optical fiber sensing, are specifically a kind of two axis Fibre Optical Sensor earthquake wave detectors.
Background technique
With going deep into for the development of seismic exploration technique, especially high-resolution exploration, to seismic prospecting data collecting
Precision and quality requires also higher and higher, it is desirable that acquisition data have wideband, high-fidelity, high s/n ratio, high dynamic, so as to more preferable
Ground identify geologic structure, lithology, fluid, Fractured Reservoir, improve reservoir location, Reservoir Characters, oil reservoir continuity description and mention
High recovery rate etc..The geophone of one of component as field data collection key, performance it is good with it is bad, will directly close
It is the effect to the acquisition quality of data and geological analysis.
In routine reflection seismic exploration, the frequency range of earthquake significant wave is received generally between 3Hz~300Hz, and
It is required that sensor is linear, stable to the phase of vibration and amplitude-frequency response in this frequency range.In current seismic prospecting
In the wave detector that field uses, induction wave detector, pressure-sensitive geophone and digital sensing can be divided into for working principle
Device is digital detector, currently, it is induction wave detector that dosage is maximum, can also divide conventional wave detector among these and surpass
Grade wave detector etc..
Electromagnetic induction principle is to utilize upper and lower two coil windings on aluminum bobbin, a coasting body is formed, by bullet
Reed is suspended in the magnetic field of permanent magnet generation, and permanent magnet is fixed together with wave detector shell.When wave detector shell with
When earth shock, coil is caused to move relative to permanent magnet, two coils generate induced electromotive force, with wave detector case vibration
Size variation, induced electromotive force also changes therewith, and speed is bigger, and induced potential is also big, when wave detector shakes, in wave detector
Output end exports corresponding electric signal, is transferred to seismic instrument.The connection of two coils should meet: in coiling, one
Coil is just rewound around another coil, and the terminal of coil and the origin or beginning of lower coil are linked togather (Opposite direction connection), up and down
Other two end of coil is as output end.When coil is moved with respect to magnet steel, since the magnetic direction of two coils is on the contrary, institute
It is added in the same direction with the induced potential of two coils of connection.External magnetic field is interfered, the induction of two coils of Opposite direction connection
Potential is reversely offset, and which improves anti-interference abilities.
The permanent magnet of induction wave detector due to by temperature, magnetic influence is big, oxidizable and magnetic field is unstable, earthquake
The sensitivity of wave detector is low, stability and poor repeatability.Site workload is big, and natural frequency selection is more, needs a large amount of inspection
The combination of wave device, arrangement is complicated, and intensity is big.In actual detection operations, geological prospecting personnel need to carry a large amount of measurement equipment,
When especially laying detector array, heavy cable and numerous detectors make us unbearably load.And it detects place and often exists
Among the great Lin of remote mountains, heavy workload, meanwhile, interference of the detector cable vulnerable to external electromagnetic field influences the reliability of data.
Summary of the invention
In view of the deficiencies in the prior art, the purpose of the present invention is to provide a kind of two axis Fibre Optical Sensor seismic waves inspections
Wave device is not only simple in structure, good economy performance, and is had and responded the advantages such as fast, highly reliable, in advanced prediction, petroleum exploration etc.
Aspect application prospect is very wide.
To achieve the above objectives, the technical solution adopted by the present invention is that: a kind of two axis Fibre Optical Sensor earthquake wave detectors, packet
Include narrow linewidth laser, X-axis photodetector, Y-axis photodetector, the first three-dB coupler, the second three-dB coupler, third
Three-dB coupler, the 4th three-dB coupler, the 5th three-dB coupler, wherein the input terminal of the first three-dB coupler passes through the first optical fiber
It is connect with narrow linewidth laser；The input terminal of second three-dB coupler passes through an output end of the second optical fiber and the first three-dB coupler
Connection；The input terminal of third three-dB coupler is connect by third optical fiber with another output end of the first three-dB coupler；4th 3dB
The output end of coupler is connect by the 4th optical fiber with X-axis photodetector；The output end of 5th three-dB coupler passes through the 5th light
Fibre is connect with Y-axis photodetector；Further include mass body, the surrounding of the mass body be connected separately with the first helical annular optical fiber,
Second helical annular optical fiber, third helical annular optical fiber and the 4th helical annular optical fiber, and the first helical annular optical fiber and third
Helical annular optical fiber is arranged along the x axis, and the second helical annular optical fiber and the 4th helical annular optical fiber are arranged along the y axis；Institute
The output end for stating the second three-dB coupler is connect by six fibers with the input terminal of third helical annular optical fiber, the 2nd 3dB coupling
Another output end of clutch is connect by the 7th optical fiber with the input terminal of the first helical annular optical fiber；The third three-dB coupler
An output end connect with the input terminal of the 4th helical annular optical fiber by the 8th optical fiber, another output of third three-dB coupler
End is connect by the 9th optical fiber with the input terminal of the second helical annular optical fiber；One input terminal of the 4th three-dB coupler passes through
Tenth optical fiber is connect with the output end of third helical annular optical fiber, and another input terminal of the 4th three-dB coupler passes through the tenth
One optical fiber is connect with the output end of the first helical annular optical fiber；One input terminal of the 5th three-dB coupler passes through the 12nd light
Fibre is connect with the output end of the 4th helical annular optical fiber, and another input terminal of the 5th three-dB coupler passes through the 13rd optical fiber
It is connect with the output end of the second helical annular optical fiber.
It based on the above technical solution, further include the barrel-shaped shell of stainless steel, the inside of the barrel-shaped shell of the stainless steel is
Vacuum, the mass body, the first helical annular optical fiber, the second helical annular optical fiber, third helical annular optical fiber and the 4th spiral
Optical fibre ring is packaged in the barrel-shaped shell of stainless steel.
Based on the above technical solution, the surrounding of the barrel-shaped shell of the stainless steel is respectively arranged with the first protection shield
Set, the second protective sheath, third protective sheath and the 4th protective sheath；The input terminal of the first helical annular optical fiber and output
End penetrates in the first protective sheath, connect respectively with the 7th optical fiber and the 11st optical fiber；The second helical annular optical fiber
Input terminal and output end penetrate in the second protective sheath, connect respectively with the 9th optical fiber and the 13rd optical fiber；The third spiral shell
The input terminal and output end for revolving optical fibre ring penetrate in third protective sheath, connect respectively with six fibers and the tenth optical fiber；
The input terminal and output end of the 4th helical annular optical fiber penetrate in the 4th protective sheath, respectively with the 8th optical fiber and the tenth
The connection of two optical fiber.
Based on the above technical solution, the mass body is the sphere with center cavity.
Based on the above technical solution, first optical fiber, the second optical fiber, third optical fiber, the 4th optical fiber, the 5th light
Fibre, six fibers, the 7th optical fiber, the 8th optical fiber, the 9th optical fiber, the tenth optical fiber, the 11st optical fiber, the 12nd optical fiber and the 13rd
Optical fiber is single mode optical fiber.
Based on the above technical solution, 40 milliwatts that the narrow linewidth laser is used to issue that wavelength to be 1550nm connect
Continuous laser.
Based on the above technical solution, the inside optical power of second optical fiber and third optical fiber is 20 milliwatts.
The beneficial effects of the present invention are:
Using Mach, once moral fiber interference principle, design rules acceleration transducer, sensor are to be with light to the present invention
Measure medium, using photoelectric device as the sensor of conversion element, it has the excellent properties such as non-contact, the fast, reliable performance of response.
With the rapid development of Optoelectronics Technology, fiber optic interferometric seismic sensor oneself become various photodetector systems in realize photoelectric conversion
Key element, and occupied an important position in sensor application, wherein being even more performer in non-contact measurement field
Irreplaceable role.When photoelectric sensor works, photoelectric device is responsible for luminous energy (infra-red radiation, visible light and ultraviolet radioactive)
Signal is converted to electrical signal.This sensor is not only simple in structure, good economy performance, and have respond it is fast, highly reliable etc. excellent
Gesture, advanced prediction, in terms of application prospect it is very wide.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of two axis Fibre Optical Sensor earthquake wave detectors in the embodiment of the present invention.
Appended drawing reference:
1- the first helical annular optical fiber；2- the second helical annular optical fiber；3- third helical annular optical fiber；The 4th helical ring of 4-
Shape optical fiber；5- narrow linewidth laser；The first optical fiber of 6-；The first three-dB coupler of 7-；The second optical fiber of 8-；9- third optical fiber；10-
Two three-dB couplers；11- six fibers；12- third protective sheath；The 7th optical fiber of 13-；The barrel-shaped shell of 14- stainless steel；15- the 4th
Protective sheath；16- third three-dB coupler；The 8th optical fiber of 17-；The tenth optical fiber of 18-；The 9th optical fiber of 19-；The 4th 3dB of 20- coupling
Device；The 11st optical fiber of 21-；The first protective sheath of 22-；23- mass body；The second protective sheath of 25-；The 13rd optical fiber of 26-；27-
5th three-dB coupler；The 5th optical fiber of 28-；The 12nd optical fiber of 29-；The 4th optical fiber of 30-；31-X axis photodetector；32-Y axis light
Electric explorer.
Specific embodiment
The embodiment of the present invention is described below in detail, the embodiment described example is shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.
In the description of the present invention, it should be noted that " laterally (X) ", " vertical if any term " center " for the noun of locality
To (Y) ", " vertical (Z) ", " length ", " width ", " thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical",
The indicating positions such as "horizontal", "top", "bottom", "inner", "outside", " clockwise ", " counterclockwise " and positional relationship is based on attached drawing institutes
The orientation or positional relationship shown is merely for convenience of the narration present invention and simplifies description, rather than the dress of indication or suggestion meaning
It sets or element must have a particular orientation, be constructed and be operated with particular orientation, should not be understood as limiting specific guarantor of the invention
Protect range.
In addition, being used for description purposes only if any term " first ", " second ", it is not understood to indicate or imply relatively heavy
The property wanted or the quantity for implicitly indicating technical characteristic." first " is defined as a result, " second " feature can be expressed or implicit include
One or more this feature, in the present description, " several ", " several " are meant that two or more, unless separately
There is clearly specific restriction.
Make this hair by being further described to a specific embodiment of the invention below with reference to the attached drawing of specification
Bright technical solution and its benefits are clearer.It describes embodiment below with reference to attached drawing to be exemplary, purport
It is explaining the present invention, and is being not considered as limiting the invention.
Shown in Figure 1, the embodiment of the invention provides a kind of two axis Fibre Optical Sensor earthquake wave detectors, including narrow linewidth
Laser 5, X-axis photodetector 31, Y-axis photodetector 32, the first three-dB coupler 7, the second three-dB coupler 10, third
Three-dB coupler 16, the 4th three-dB coupler 20, the 5th three-dB coupler 27, wherein the input terminal of the first three-dB coupler 7 passes through the
One optical fiber 6 is connect with narrow linewidth laser 5；The input terminal of second three-dB coupler 10 is coupled by the second optical fiber 8 with the first 3dB
One output end of device 7 connects；The input terminal of third three-dB coupler 16 is another by third optical fiber 9 and the first three-dB coupler 7
Output end connection；The output end of 4th three-dB coupler 20 is connect by the 4th optical fiber 30 with X-axis photodetector 31；5th 3dB
The output end of coupler 27 is connect by the 5th optical fiber 28 with Y-axis photodetector 32；It further include mass body 23, the mass body 23
Surrounding be connected separately with the first helical annular optical fiber 1, the second helical annular optical fiber 2, third helical annular optical fiber 3 and the 4th spiral shell
Optical fibre ring 4 is revolved, and the first helical annular optical fiber 1 and third helical annular optical fiber 3 are arranged along the x axis, the second helical annular
Optical fiber 2 and the 4th helical annular optical fiber 4 are arranged along the y axis；Specifically, mass body 23 is the sphere with center cavity.Matter
It measures body 23 and perceives X-direction and Y-direction seismic signal, the first helical annular optical fiber 1 and third helical annular optical fiber 3 formed Mach once
The differential smooth arm of two of Deccan interferometer is connected, main perception level using the second three-dB coupler 10 and the 4th three-dB coupler 20
The seismic wave in direction；Two differences of the second helical annular optical fiber 2 and the 4th helical annular optical fiber 4 composition Mach-Zehnder interferometer
Dynamic light arm, is connected using third three-dB coupler 16 and the 5th three-dB coupler 27, the main seismic wave for perceiving vertical direction.
One output end of the second three-dB coupler 10 is connected by the input terminal of six fibers 11 and third helical annular optical fiber 3
It connects, another output end of the second three-dB coupler 10 is connect by the 7th optical fiber 13 with the input terminal of the first helical annular optical fiber 1；
One output end of third three-dB coupler 16 is connected by the input terminal of the 8th optical fiber 17 and the 4th helical annular optical fiber 4
It connects, another output end of third three-dB coupler 16 is connect by the 9th optical fiber 19 with the input terminal of the second helical annular optical fiber 2；
One input terminal of the 4th three-dB coupler 20 is connected by the output end of the tenth optical fiber 18 and third helical annular optical fiber 3
It connects, another input terminal of the 4th three-dB coupler 20 is connected by the output end of the 11st optical fiber 21 and the first helical annular optical fiber 1
It connects；
One input terminal of the 5th three-dB coupler 27 passes through the output end of the 12nd optical fiber 29 and the 4th helical annular optical fiber 4
Another input terminal of connection, the 5th three-dB coupler 27 is connected by the output end of the 13rd optical fiber 26 and the second helical annular optical fiber 2
It connects.
First helical annular optical fiber 1, the second helical annular optical fiber 2, third helical annular optical fiber 3, the 4th helical annular light
Fibre 4 and mass body 23 constitute Mach-Zehnder interferometer sensor, and Vibration Signal in Frequency Domain can make mass body 23 generate sliding motion, draw
Stretch or compress the first helical annular optical fiber 1, the second helical annular optical fiber 2, third helical annular optical fiber 3, the 4th helical annular light
Fibre 4 generates reciprocal micromotion, and Mach-Zehnder interferometer can generate interference signal.
Specifically, further including the barrel-shaped shell 14 of stainless steel, the inside of the barrel-shaped shell 14 of the stainless steel is vacuum, mass body
23, the first helical annular optical fiber 1, the second helical annular optical fiber 2, third helical annular optical fiber 3 and the 4th helical annular optical fiber 4 are equal
It is packaged in the barrel-shaped shell 14 of stainless steel, is isolated in sensor internal.
Specifically, the surrounding of the barrel-shaped shell 14 of stainless steel be respectively arranged with the first protective sheath 22, the second protective sheath 25,
Third protective sheath 12 and the 4th protective sheath 15；
The input terminal and output end of first helical annular optical fiber 1 penetrate in the first protective sheath 22, respectively with the 7th light
Fine 13 and the 11st optical fiber 21 connection；
The input terminal and output end of second helical annular optical fiber 2 penetrate in the second protective sheath 25, respectively with the 9th light
Fine 19 and the 13rd optical fiber 26 connection；
The input terminal and output end of third helical annular optical fiber 3 penetrate in third protective sheath 12, respectively with the 6th light
Fibre 11 and the tenth optical fiber 18 connect；
The input terminal and output end of 4th helical annular optical fiber 4 penetrate in the 4th protective sheath 15, respectively with the 8th light
Fine 17 and the 12nd optical fiber 29 connection.
Specifically, the first optical fiber 6, the second optical fiber 8, third optical fiber 9, the 4th optical fiber 30, the 5th optical fiber 28, six fibers
11, the 7th optical fiber 13, the 8th optical fiber 17, the 9th optical fiber 19, the tenth optical fiber 18, the 11st optical fiber 21, the 12nd optical fiber the 29, the tenth
Three optical fiber 26, the first helical annular optical fiber 1, the second helical annular optical fiber 2, third helical annular optical fiber 3 and the 4th helical annular
Optical fiber 4 is single mode optical fiber.
Specifically, narrow linewidth laser 5 is used to issue the 40 milliwatt continuous lasers that wavelength is 1550nm.Specifically, second
The inside optical power of optical fiber 8 and third optical fiber 9 is 20 milliwatts.
The operation principle of the present invention is that:
Narrow linewidth laser 5 issues the 40 milliwatt continuous lasers that wavelength is 1550nm and enters the first optical fiber 6, the first optical fiber 6
Internal continuous laser generates beam splitting, the laser of power-take-off each 50%, into the second light after entering the first three-dB coupler 7
Fibre 8 and third optical fiber 9, the second optical fiber 8 and 9 inside optical power of third optical fiber are 20 milliwatts.
Second optical fiber 8 is connect with the second three-dB coupler 10, and laser is input to the second three-dB coupler 10, the 2nd 3dB coupling
Device 10 and the 4th three-dB coupler 20 constitute a pair of of Mach-Zehnder interferometer, for perceiving the seismic wave of X-axis, one of interferometer
Light arm is by six fibers 11, and third helical annular optical fiber 3 and the tenth optical fiber 18 are constituted；Another light arm of interferometer be by
7th optical fiber 13, the first helical annular optical fiber 1 and the 11st optical fiber 21 are constituted；First helical annular optical fiber 1 and third spiral
Optical fibre ring 3 constitutes differential interference light arm, i.e., when the first helical annular 1 Tensile of optical fiber, third helical annular optical fiber 3 is pressurized
Contracting, vice versa.Continuous narrow-linewidth laser is entered by 10 beam splitting of the second three-dB coupler by reference light arm and sense light arm
4th three-dB coupler 20, slight earthquake signal make the first helical annular optical fiber 1 and third helical annular optical fiber 3 generate deformation, swash
Light, which converges the 4th three-dB coupler 20, can generate interference, and interference light is transferred to X-axis photodetector 31 by the 4th optical fiber 30, will
Optical signal conversion is exported at electric signal.
Third optical fiber 9 is connect with third three-dB coupler 16, and laser is input to third three-dB coupler 16, the 3rd 3dB coupling
Device 16 and the 5th three-dB coupler 27 constitute a pair of of Mach-Zehnder interferometer, for perceiving the seismic wave of Y-axis, one of interferometer
Light arm is by the 8th optical fiber 17, and the 4th helical annular optical fiber 4 and the 12nd optical fiber 29 are constituted；Another light arm of interferometer is
By the 9th optical fiber 19, the second helical annular optical fiber 2 and the 13rd optical fiber 26 are constituted；Second helical annular optical fiber 2 and the 4th spiral shell
Revolve optical fibre ring 4 constitute differential interference light arm, i.e., when the second helical annular 2 Tensile of optical fiber, the 4th helical annular optical fiber 4 by
Compression, vice versa.Continuous narrow-linewidth laser by 16 beam splitting of third three-dB coupler, by reference light arm and sense light arm into
Entering the 5th three-dB coupler 27, slight earthquake signal makes the second helical annular optical fiber 2 and the 4th helical annular optical fiber 4 generate deformation,
Laser, which converges the 5th three-dB coupler 27, can generate interference, and interference light is transferred to Y-axis photodetector 32 by the 5th optical fiber 28,
Convert optical signals into electric signal output.
There are when angle, X-axis photodetector 31 and Y-axis photodetector 32 all can have voltage defeated for seismic wave and XY axis
Out.
In the description of specification, reference term " one embodiment ", " preferably ", " example ", " specific example " or " one
The description of a little examples " etc. means particular features, structures, materials, or characteristics described in conjunction with this embodiment or example, is contained in
In at least one embodiment of the present invention or example, the schematic representation of above-mentioned term is not necessarily referred in the present specification
It is identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can at any one or
It is combined in a suitable manner in multiple embodiments or example.
The present invention is not limited to the above-described embodiments, for those skilled in the art, is not departing from
Under the premise of the principle of the invention, several improvements and modifications can also be made, these improvements and modifications are also considered as protection of the invention
Within the scope of.The content being not described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
Claims (7)
1. a kind of two axis Fibre Optical Sensor earthquake wave detectors, including narrow linewidth laser (5), X-axis photodetector (31), Y-axis
Photodetector (32), the first three-dB coupler (7), the second three-dB coupler (10), third three-dB coupler (16), the 4th 3dB coupling
Clutch (20), the 5th three-dB coupler (27), wherein the input terminal of the first three-dB coupler (7) passes through the first optical fiber (6) and narrow line
Wide laser (5) connection；The input terminal of second three-dB coupler (10) passes through the second optical fiber (8) and the first three-dB coupler (7)
The connection of one output end；The input terminal of third three-dB coupler (16) is another by third optical fiber (9) and the first three-dB coupler (7)
Output end connection；The output end of 4th three-dB coupler (20) is connect by the 4th optical fiber (30) with X-axis photodetector (31)；
The output end of 5th three-dB coupler (27) is connect by the 5th optical fiber (28) with Y-axis photodetector (32)；It is characterized by:
It further include mass body (23), the surrounding of the mass body (23) is connected separately with the first helical annular optical fiber (1), the second helical annular
Optical fiber (2), third helical annular optical fiber (3) and the 4th helical annular optical fiber (4), and the first helical annular optical fiber (1) and third
Helical annular optical fiber (3) is arranged along the x axis, and the second helical annular optical fiber (2) and the 4th helical annular optical fiber (4) are along Y-axis side
To setting；
One output end of second three-dB coupler (10) is defeated by six fibers (11) and third helical annular optical fiber (3)
Enter end connection, another output end of the second three-dB coupler (10) passes through the 7th optical fiber (13) and the first helical annular optical fiber (1)
Input terminal connection；
One output end of the third three-dB coupler (16) is defeated by the 8th optical fiber (17) and the 4th helical annular optical fiber (4)
Enter end connection, another output end of third three-dB coupler (16) passes through the 9th optical fiber (19) and the second helical annular optical fiber (2)
Input terminal connection；
One input terminal of the 4th three-dB coupler (20) is defeated by the tenth optical fiber (18) and third helical annular optical fiber (3)
Another input terminal of outlet connection, the 4th three-dB coupler (20) passes through the 11st optical fiber (21) and the first helical annular light
The output end connection of fine (1)；
One input terminal of the 5th three-dB coupler (27) passes through the 12nd optical fiber (29) and the 4th helical annular optical fiber (4)
Another input terminal of output end connection, the 5th three-dB coupler (27) passes through the 13rd optical fiber (26) and the second helical annular
The output end of optical fiber (2) connects.
2. two axis Fibre Optical Sensor earthquake wave detector as described in claim 1, it is characterised in that: further include that stainless steel is barrel-shaped outer
Shell (14), the inside of the barrel-shaped shell of the stainless steel (14) are vacuum, the mass body (23), the first helical annular optical fiber (1), the
It is barrel-shaped that two helical annular optical fiber (2), third helical annular optical fiber (3) and the 4th helical annular optical fiber (4) are packaged in stainless steel
In shell (14).
3. two axis Fibre Optical Sensor earthquake wave detector as claimed in claim 2, it is characterised in that: the barrel-shaped shell of stainless steel
(14) surrounding is respectively arranged with the first protective sheath (22), the second protective sheath (25), third protective sheath (12) and the 4th
Protective sheath (15)；
The input terminal and output end of the first helical annular optical fiber (1) penetrate in the first protective sheath (22), respectively with the
Seven optical fiber (13) and the connection of the 11st optical fiber (21)；
The input terminal and output end of the second helical annular optical fiber (2) penetrate in the second protective sheath (25), respectively with the
Nine optical fiber (19) and the connection of the 13rd optical fiber (26)；
The input terminal and output end of the third helical annular optical fiber (3) penetrate in third protective sheath (12), respectively with the
Six fibers (11) and the connection of the tenth optical fiber (18)；
The input terminal and output end of the 4th helical annular optical fiber (4) penetrate in the 4th protective sheath (15), respectively with the
Eight optical fiber (17) and the connection of the 12nd optical fiber (29).
4. two axis Fibre Optical Sensor earthquake wave detector as described in claim 1, it is characterised in that: the mass body (23) is tool
There is the sphere of center cavity.
5. two axis Fibre Optical Sensor earthquake wave detector as described in claim 1, it is characterised in that: first optical fiber (6),
Two optical fiber (8), third optical fiber (9), the 4th optical fiber (30), the 5th optical fiber (28), six fibers (11), the 7th optical fiber (13),
Eight optical fiber (17), the 9th optical fiber (19), the tenth optical fiber (18), the 11st optical fiber (21), the 12nd optical fiber (29) and the 13rd light
Fine (26) are single mode optical fiber.
6. two axis Fibre Optical Sensor earthquake wave detector as described in claim 1, it is characterised in that: the narrow linewidth laser
(5) for issuing the 40 milliwatt continuous lasers that wavelength is 1550nm.
7. two axis Fibre Optical Sensor earthquake wave detector as described in claim 1, it is characterised in that: second optical fiber (8) and
The inside optical power of third optical fiber (9) is 20 milliwatts.
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| CN201810749098.9A CN108931809A (en) | 2018-07-10 | 2018-07-10 | Two axis Fibre Optical Sensor earthquake wave detectors |
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| CN201810749098.9A CN108931809A (en) | 2018-07-10 | 2018-07-10 | Two axis Fibre Optical Sensor earthquake wave detectors |
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