WO2016052974A1 - Optical fiber bragg grating-based sensor and measurement device using same - Google Patents

Abstract

The present invention comprises: an optical fiber (2); an optical fiber Bragg grating (2a) formed on a part of the optical fiber; a tension application unit (9) arranged so as to apply a tension to the optical fiber Bragg grating; and a magnet unit (1) for driving the tension application unit, wherein the tension application unit is driven, when the distance to the magnet unit is equal to or less than a predetermined distance, and applies a tension to the optical fiber Bragg grating, thereby deforming the corresponding optical fiber Bragg grating and changing the wavelength of light that passes through the optical fiber.

Description

Fiber Bragg Grating Based Sensor and Measuring Device Using the Same

The present invention forms a plurality of optical fiber Bragg grating (Fiber Bragg Grating) on a single fiber according to a certain length, for example, the characteristics of the wavelength of the light reflected from each grating is changed according to external conditions such as tensile strength The present invention relates to an optical fiber Bragg grating based sensor and a measuring device using the same.

In recent years, due to global warming, extreme weather events such as heavy rains, storms, and heavy snows occur frequently, and in order to observe such local weather abnormalities, the necessity of installing meteorological observation facilities in remote areas of the mountains or in the distant seas is increasing. have.

In order to meet such a request, an increasing number of measuring devices are installed in remote areas such as mountainous regions, distant oceans, and uninhabited islands to measure weather conditions such as heavy rain, storms and heavy snow in real time.

However, since the current meteorological measuring device currently used uses an electronic sensor device that needs to be supplied from outside, it is difficult to install in an area where power supply is difficult, such as in remote mountains or in the distant ocean.

SUMMARY OF THE INVENTION The present invention has been made in view of the problems of the prior art, and an object thereof is to provide an optical fiber Bragg grating based sensor capable of observing the weather without a power supply and an observation apparatus using the same.

The optical fiber Bragg grating-based sensor of the present invention for solving the above problems, an optical fiber, an optical fiber Bragg grating formed on a portion of the optical fiber, tension applying means arranged to apply tension to the optical fiber Bragg grating, and the tension applying means And a magnet portion for driving the light source, wherein the tension applying means drives the distance when the distance from the magnet portion is within a predetermined distance to apply tension to the optical fiber Bragg grating to deform the optical fiber Bragg grating to pass through the optical fiber. To change.

Preferably, the magnet portion includes a rotating shaft, a rotating body rotating about the rotating shaft, and a magnet disposed at an opposite end of the rotating shaft of the rotating body, wherein the rotating body rotates about the rotating shaft. The distance between the tension applying means and the magnet portion is closer or farther within a predetermined distance.

Preferably, the tension applying means includes a moving axis moving in the rotational axis direction when the distance between the tension applying means and the magnet portion approaches within a predetermined distance, and the optical fiber Bragg grating while interlocking with the moving axis. And a tensile strength changing member for applying the tension, and an elastic member for regulating the moving distance of the moving shaft in the rotational axis direction to be within a predetermined distance.

In addition, the precipitation measurement apparatus of the present invention includes a tipping bucket and a fiber Bragg grating based sensor for detecting the seesaw operation of the tipping bucket in response to the rainfall falling per unit time, the fiber Bragg grating based sensor The one of the optical fiber Bragg grating-based sensor, the distance between the tension applying means and the magnet portion is changed by rotating the magnet portion in conjunction with the seesaw operation of the tipping bucket.

In addition, the wind direction measuring apparatus of the present invention includes a wind vane rotating in the wind blowing direction, and a fiber Bragg grating-based sensor for detecting the rotation of the wind vane, the optical fiber Bragg grating-based sensor is any one of the The optical fiber Bragg grating-based sensor, the distance between the tension applying means and the magnet portion is changed by the magnet portion rotates in conjunction with the rotation of the wind vane.

In addition, the wind speed measuring apparatus of the present invention includes a wind distribution member that rotates according to the wind speed, and an optical fiber Bragg grating-based sensor for detecting the rotation of the wind distribution member, wherein the optical fiber Bragg grating-based sensor is the one of the optical fibers Bragg grating-based sensor, the distance between the tension applying means and the magnet portion is changed by the magnet portion rotates in conjunction with the rotation of the wind distribution member.

The optical fiber Bragg grating-based sensor of the present invention and the observation system using the same include a magnet portion for varying the degree of tension of the optical fiber Bragg grating, so that the wavelength of light passing through the optical fiber according to the degree of tension of the optical fiber Bragg grating which varies with the magnetic force change of the magnet part. Since it senses the change and observes weather such as precipitation, wind direction, and wind speed, it is easy to install at the site where power supply is difficult because power supply equipment is not required at the observation site, and economic efficiency can be improved due to large power consumption reduction effect.

1 is a schematic diagram schematically showing a schematic configuration of an optical fiber Bragg grating based sensor of a preferred embodiment of the present invention;

2 is a graph showing a wavelength change of light passing through an optical fiber according to the position of the magnet of FIG.

3 is a schematic diagram showing an apparatus for measuring precipitation using an optical fiber Bragg grating based sensor according to an embodiment;

4 is a schematic view showing a wind direction / wind speed measuring apparatus using an optical fiber Bragg grating-based sensor according to the embodiment,

5 is a plan view showing a circular ring counterweight included in the wind direction / wind velocity measurement apparatus using the optical fiber Bragg grating-based sensor according to the embodiment,

FIG. 6 is a plan view illustrating an optical fiber Bragg grating based sensor according to an exemplary embodiment in which the wind direction of FIG. 4 is sensed;

FIG. 7 is a plan view illustrating an optical fiber Bragg grating based sensor according to an exemplary embodiment of sensing wind speed of FIG. 4; FIG.

FIG. 8 is a graph illustrating a change in wavelength of light passing through an optical fiber according to the magnet position of FIG. 6.

EMBODIMENT OF THE INVENTION Hereinafter, preferred embodiment of this invention is described in detail, referring an accompanying drawing.

<Example 1>

This embodiment relates to an optical fiber Bragg grating based sensor. 1 is a schematic diagram schematically showing a configuration of an optical fiber Bragg grating based sensor of a preferred embodiment of the present invention.

As shown in FIG. 1, the optical fiber Bragg grating-based sensor 10 of the first embodiment has a tension outside the optical fiber 2 and the magnet part 1 and the optical fiber Bragg grating 2a in which the optical fiber Bragg grating 2a is formed. It includes a tension applying unit 9 for applying.

The optical fiber 2 is an optical fiber of a known configuration, and the optical fiber Bragg grating 2a is a known optical fiber Bragg grating formed along a predetermined length in a part of this known optical fiber.

The magnet part 1 provides a driving force to the tension applying part 9 which applies or releases tension to the outside of the optical fiber Bragg grating 2a, and is coupled to the rotating shaft 3 so as to be movable rotationally. A rotating body 5 and a magnet 7 disposed at an end opposite to the rotating shaft 3 of the rotating body 5 and made of, for example, a permanent magnet, and the like. For example, as shown in (a) and (b) of FIG. 1, when the rotating body 5 rotates about the rotating shaft 3, the magnet 7 and the tension applying portion 9 disposed at the end thereof are rotated. The distance between the magnet detection unit 93 is farther away than the predetermined distance or closer to within the predetermined distance.

The tension applying unit 9 includes a moving shaft 91, a magnet detecting unit 93, a slide guide 95, an elastic member 97, and a tensile strength changing member 99.

The movement shaft 91 is disposed in a direction perpendicular to the optical fiber 2 at a position extending from the rotation shaft 3 of the magnet portion 1, and can linearly reciprocate in a direction approaching or away from the rotation shaft 3. Axis is arranged.

The magnet detecting unit 93 is disposed at the end of the moving shaft 91 close to the rotation shaft 3, and is preferably formed of a magnetic material that can be attracted by the magnetic force of the magnet 7.

The slide guide 95 is disposed on at least one side of the moving shaft 91, and guides the moving shaft 91 to linearly reciprocate along the direction of the rotating shaft 3 of the rotating body 5.

The elastic member 97 is disposed at an end opposite to the rotational axis 3 of the movement shaft 91 so that one end is connected to the end opposite to the rotational shaft 3 and the other end is fixed to a case or the like, not shown, The moving distance in the direction of the rotation axis 3 of the 91 is regulated to be within a certain distance, for example, it can be composed of an elastic body such as a coil spring.

The tensile strength changing member 99 is arranged to be movable in connection with a linear reciprocating motion of the moving shaft 91 in contact with the optical fiber Bragg grating 2a, and as shown in FIG. When the moving shaft 91 moves in the direction of arrow A, no tension is applied to the optical fiber Bragg grating 2a, and the moving shaft 91 of the tension applying unit 9 moves in the direction of arrow B as shown in FIG. When moved, tension is applied to the optical fiber Bragg grating 2a to deform the optical fiber Bragg grating 2a. In Fig. 1, the tensile strength changing member 99 has a semicircular shape, but it is not necessarily a semicircular shape, and may be any shape as long as it can change the tension applied to the optical fiber Bragg grating 2a.

Next, the operation of the optical fiber Bragg grating-based sensor 10 of the first embodiment will be described with reference to FIG. 2. FIG. 2 is a graph illustrating a wavelength change of light passing through an optical fiber according to the position of the magnet of FIG. 1.

First, the magnetic body 1 is rotated around the rotating shaft 3 in a state as shown in Fig. 1 (a) by a force applied from the outside (specific examples will be described in Examples 2 and 3). When the magnet (5) is rotated counterclockwise and the magnet (7) is rotated to a position away from the magnet sensing unit (93) of the tension applying unit (9), the magnetic force of the magnet (7) of the magnet unit (1) The suction force is weaker than the force by which the elastic member 97 of the tension applying section 9 pulls the moving shaft 91 in a direction away from the rotation shaft 3, so that the moving shaft 91 of the tension applying section 9 is shown in FIG. It becomes the state moved to the arrow A direction of 1 (a), and in this state, the tension by the tensile strength change member 99 is not applied to the optical fiber Bragg grating 2a.

Next, when the position of the magnet part 1 is changed from (a) to (b) in FIG. 1, the rotating body 5 rotates clockwise about the rotating shaft 3 so that the rotating shaft 3 and the magnet are rotated. The sensing unit 93 and the moving shaft 91 are in a state of being in a straight line, whereby the magnetic force (suction force) of the magnet 7 of the magnet unit 1 is the elastic member 97 of the tension applying unit 9. Is stronger than the pulling force of the moving shaft 91 in the direction away from the rotation shaft 3, so that the moving shaft 91 of the tension applying section 9 is moved in the direction of the arrow B in FIG. 1 (b), In this state, the optical fiber Bragg grating 2a is in a state in which its shape is deformed by the tension applied by the tensile strength changing member 99.

Therefore, in this embodiment, the magnet 7 pulls the magnet sensing unit 93 in the rotational axis 3 direction, and the elastic member 97 moves the movement axis 91 in the direction opposite to the rotational axis 3 direction. The relation with the pulling force is that when the magnet 7 of the magnet part 1 is located away from the magnet sensing part 93 of the tension applying part 9 as shown in FIG. The elastic member 97 pulls the magnet detecting part 93 in the direction opposite to the rotation axis 3 via the moving shaft 91 rather than the force that pulls the magnet detecting part 93 in the rotation axis 3 direction. When the pulling force is greater and, conversely, the magnet 7 of the magnet part 1 is in a position close to the magnet sensing part 93 of the tension applying part 9 as shown in FIG. The force that pulls the magnet sensing portion 93 in the direction of the rotational axis 3 causes the elastic member 97 to pull the magnet sensing portion 93 in the direction opposite to the direction of the rotational axis 3 through the movement axis 91. Greater than the pulling force You can set it to be a relationship.

As shown in FIG. 1A, the wavelength of light passing through the optical fiber 2 in a state in which tension is not applied to the optical fiber Bragg grating 2a by the tension applying unit 9 is referred to as λ ₃ , and the tension applying unit ( 9) the tension is applied to the optical fiber Bragg grating 2a so that the wavelength of the light passing through the optical fiber 2 in the state where the optical fiber Bragg grating 2a is deformed as shown in FIG. 1 (b) is λ ₃ + Δλ. In this case, for example, the change in the physical quantity can be sensed by counting the number of times the wavelength of the light passing through the optical fiber 2 changes between λ ₃ and λ ₃ + Δλ.

In addition, the optical fiber Bragg grating-based sensor 10 of the present embodiment is installed at a plurality of remote locations, and the wavelength of light of the optical fiber 2 of each of the plurality of optical fiber Bragg grating-based sensors 10 is set to different wavelengths. May be identified.

In addition, in the above description, the rotating body 5 of the magnet 1 moves only as a pendulum about the rotating shaft 3, but the rotating body 5 is formed around the rotating shaft 3. You can also configure to exercise.

<Example 2>

Next, Example 2 is demonstrated. The second embodiment relates to an example of using the optical fiber Bragg grating-based sensor 10 of the first embodiment for the precipitation measurement, Figure 3 is a schematic diagram showing a precipitation measurement apparatus using the optical fiber Bragg grating-based sensor according to the second embodiment.

As shown in FIG. 3, the precipitation measuring apparatus using the optical fiber Bragg grating-based sensor according to Embodiment 2 performs seesawing from side to side according to the amount of rainwater and stores or stores rainwater in a space formed in the tipping bucket 11. Tipping bucket 11, which is operated to throw away the outside, a pivot shaft 13 serving as a central axis of the seesaw, a support 15 fixed to a lower portion of the pivot shaft 13 of the tipping bucket 11, The magnet 17 fixed to the end of the support 15, and applied in conjunction with the linear reciprocating motion of the tension applying unit 19 and the tension applying unit 19 to perform a linear reciprocating motion in accordance with the change in the magnetic force of the magnet 17 The optical fiber Bragg grating 210 is installed so that the tension is changed to include the optical fiber 21 is formed.

Here, the rotating shaft 13, the support 15, and the magnet 17 correspond to the rotating shaft 3, the rotating body 5 and the magnet 7 of the first embodiment, respectively, and the tension applying unit 19 Corresponding to the tension applying unit 9 of the first embodiment, the optical fiber Bragg grating 210 and the optical fiber 21 correspond to the optical fiber Bragg grating 2a and the optical fiber 2, respectively.

In addition, the tension applying unit 19 includes a moving shaft 191, a magnet detecting unit 193, a slide guide 195, an elastic member 197, and a tensile strength changing member 199, wherein the moving shaft 191 is on the moving shaft 91 of the first embodiment, the magnet detecting unit 193 is the magnet detecting unit 93 of the first embodiment, the slide guide 195 is the slide guide 95 of the first embodiment The elastic member 197 corresponds to the elastic member 97 of the first embodiment, and the tensile strength changing member 199 corresponds to the tensile strength changing member 99 of the first embodiment, respectively.

In addition, the tipping bucket 11 collects rainwater in a space formed in the tipping bucket 11 itself when it rains, and when a predetermined amount of rainwater collects in the space of the tipping bucket 11, the tipping bucket ( 11) is rotated to be inclined by a predetermined angle as shown in Fig. 3 (a) to discard the rainwater filled in the space, if the water is discarded lightly rotates again to the position as shown in Fig. 3 (b) to fill the rain water is repeated Is configured to.

Next, the operation of the second embodiment will be described.

First, in the initial state, the tipping bucket 11 is in the state of FIG. 3 (b), that is, the rotation shaft 13 and the rotational body 15 and the movement shaft 191 are located in a straight line. 13 is a position in which the elastic force of the elastic member 197 is overcome and pulled toward the rotation axis 13, whereby the tensile strength changing member 199 also moves toward the rotation axis 3 to tension the optical fiber Bragg grating 210. This becomes the applied state.

In this state, when the rain falls, the rainwater is filled in the space of the tipping bucket 11, and when a certain amount of rainwater collects in the space of 11, the rotation shaft 13 is inclined at an angle as shown in FIG. 3 (a) by the weight of the rainwater. ) Rotates counterclockwise around, thereby discarding the rainwater filled in the tipping bucket 11 to the outside.

At this time, in FIG. 3A, the distance between the magnet 17 and the magnet sensing unit 193 of the tension applying unit 19 is farther than that in FIG. 3B, and the magnet ( The suction force of the magnet 17 and the elastic member 197 have a greater force for the elastic member 197 of the tension applying unit 19 to pull the moving shaft 191 than the suction force that the 17 attracts the magnet sensing unit 193. Since the tension of the is adjusted, the moving shaft 191 is moved away from the rotation axis 13 by the force of the elastic member 197, and the tensile strength changing member 199 is attached to the optical fiber Bragg grating 210. The tension by is not applied.

In addition, when the tipping bucket 11 is in the state of FIG. 3 (a) and all the rainwater collected in the tipping bucket 11 is discharged to the outside, the tipping bucket 11 returns to the position of FIG. 3 (b) again. Go ahead and repeat the previous operation, the number of repetitions of the operation per unit time is determined in proportion to the amount of rainwater filling tipping bucket 11 per unit time, that is, rainfall per unit time.

In addition, as in the first embodiment, a change in the intensity of light passing through the optical fiber 20 occurs in the state of (a) and (b) of FIG. Can be measured.

According to the inventors, the accuracy of the precipitation measurement by the optical fiber Bragg grating-based sensor has an error range accuracy within ± 3% at rainfall intensity of 20 mm / h to 50 mm / h, and the resolution is 0.4 mm to 0.6 mm. .

Example 3

Hereinafter, the wind direction / wind speed measuring apparatus using the optical fiber grating-based sensor according to the third embodiment will be described in detail.

Figure 4 is a schematic diagram showing the wind direction / wind speed measuring apparatus using the optical fiber Bragg grating based sensor according to the third embodiment, Figure 5 is a circular annular ring included in the wind direction / wind speed measuring apparatus using the optical fiber Bragg grating based sensor according to the third embodiment A plan view showing the counterweight. 6 is a plan view illustrating an optical fiber Bragg grating based sensor according to the third embodiment of the present invention for sensing the wind direction of FIG. 4, and FIG. 7 is a plan view illustrating an optical fiber Bragg grating based sensor according to the third embodiment for sensing the wind speed of FIG. 4. .

4 to 7, the wind direction / wind velocity measuring apparatus using the optical fiber Bragg grating-based sensor according to the third embodiment is provided with a wind vane 311 and a wind distribution member 313 to rotate by wind direction / wind speed. The wind velocity rotating part 31 and the wind direction blade 311 are disposed below the wind direction rotary pillar 33 and the wind direction rotating member 33 and rotated in conjunction with the wind direction member 311, The second support fixed vertically to the other side of the wind support rotary pillar (34), the first support (35) vertically fixed to one side of the wind direction rotary column (33), which rotates in the same way in conjunction with ( 35 ′), the third support 36 vertically fixed to one side of the wind turbine 34, the fourth support 36 ′ vertically fixed to the other side of the wind turbine 34, and the first support 35. And a counterweight (3) provided at each of the magnets 37, the second support 35 'and the fourth support 36' fixed to the ends of each of the third support 36 and 8), the optical fiber 41, the optical fiber Bragg grating 410 is formed is interlocked according to the linear reciprocating motion of the tension applying unit 39 and the linear linear reciprocating motion according to the change of the magnetic force of the magnet 37 Include.

Here, the optical fiber Bragg grating-based sensor according to the third embodiment includes the optical fiber 41 formed with the magnet 37, the tension applying unit 39 and the optical fiber Bragg grating 410, the linear reciprocating motion of the tension applying unit 39 Sensing a wavelength variation generated according to the degree of tension of the optical fiber Bragg grating 410 is changed in proportion to the. In addition, the magnet portion includes a magnet 37 and a tension applying portion 39.

The wind vane 311 rotates the wind direction rotary column 33 in the wind blowing direction by the wind.

The wind distribution member 313 has a plurality of wind distributions (wind) is integrally installed radially and irrespective of the direction of the wind when the wind is rotated by the wind, and is rotatable even in the fine wind. Here, each of the wind cups may be formed in a hemispherical shape whose belly is bulging to one side, and may be formed like a cup concave inside.

Since the magnet 37 is fixed to each end of each of the first support 35 and the second support 36, the magnet 37 rotates in accordance with the rotational operation of the first support 35 or the second support 36.動)). The magnet 37 may be a permanent magnet.

The counterweight 38 is installed so that the wind direction rotary column 33 and the wind speed rotation column 34 rotate in proportion to the wind speed and the wind speed even at a small wind and wind speed. That is, in the case of small wind and wind speed, since the magnet 37 is fixed to the tension applying unit 39 by the magnetic force, the wind direction rotary column 33 and the wind speed rotation column 34 have small size of the wind and wind speed. It may not rotate freely in proportion to. In order to prevent such adverse effects, the balance weight 38 is installed to generate an inertia moment using a torque. In addition, the counterweight 38 may be installed in a ring-shaped circular ring, as shown in FIG.

The tension applying unit 39 includes a moving shaft 391, a magnet sensing unit 393, a slide guide 395, an elastic member 397, and a tensile strength changing member 399. For example, the tension applying unit 39 includes eight tension applying units disposed in each of east (E), west (W), south (S), north (N) and northeast, southeast, northwest, and southwest directions. 39. In addition, as shown in FIG. 6, the tension applying unit 39 includes four tension applying units 39 disposed in directions of copper (E), west (W), south (S), and north (N), respectively. It can be composed of).

The moving shaft 391 is spaced apart from the magnet 37. For example, as shown in Fig. 5, the moving shaft 391 is a magnet (37) rotation (rotation) of the middle east (E), west (W), south (S) and north ( It is located at a position opposite to the magnet 37 when it is located at any one of N) and spaced apart.

The magnet detecting unit 393 is fixed to the upper end of the moving shaft 391 and detects the magnetic force of the magnet 37. Here, the magnet detecting unit 393 may be a metal bar.

In addition, the moving shaft 391 and the magnet detecting unit 393 may include a magnet (a magnet) when the magnet 37 reaches a position opposite to the moving shaft 391 during the rotation (rotation) of the magnet 37. It is lifted up by the influence of 37) magnetic force. Here, the magnetic force generated by the magnet 37 may vary depending on the design features of the system, but may be strong enough to move the moving shaft 391 and the magnet sensing portion 393 upward. Accordingly, the moving shaft 391 is moved upward and attracted toward the magnet 37 through the magnetic force generated by the magnet 37.

The slide guide 395 is disposed at one lower portion of the moving shaft 391 to guide the movable shaft 391 to be movable.

The elastic member 397 is disposed under the moving shaft 391 and is configured to prevent the magnet 37 and the magnet sensing unit 393 from contacting each other. That is, the elastic member 397 is configured such that there is a gap between the magnet 37 and the magnet sensing unit 393 throughout the rotation (rotation) of the magnet 37. In addition, the elastic member 397 is rotated (rotated) to a position where the magnet 37 is not opposed to the moving shaft 391 so that the magnetic force applied to the magnet sensing unit 393 disappears. 391) can be pulled down and moved to its initial position. Here, the elastic member 397 may be a spring.

The tensile strength changing member 399 is a seating portion of the optical fiber Bragg grating 410, and is disposed on the side of the moving shaft 391. For example, the tensile strength changing member 399 is disposed at the upper side of the other side of the moving shaft 191 opposite to one side of the moving shaft 391. In addition, the tensile strength changing member 399 may be disposed on the upper portion of one side of the moving shaft (391). Here, the tensile strength changing member 199 may be connected to the optical fiber Bragg grating 210 by a connecting means such as an annular band. In addition, the tensile strength changing member 399 may be an arch bracket to increase the degree of tension of the optical fiber Bragg grating 410.

FIG. 8 is a graph illustrating a change in wavelength of light passing through an optical fiber according to the magnet position of FIG. 6.

The wind direction / wind speed measuring device configured as described above is the wind direction feather 311 is rotated in the direction of the wind blowing and the wind direction rotary column 33 is rotated in conjunction with the rotation, the wind breeze member 313 is rotated when the wind blows In conjunction with its rotation, the wind speed rotating column 34 is rotated. In this case, the optical fiber Bragg grating-based sensor according to the third embodiment senses the rotation of the wind direction rotating column 33 and the wind speed rotating column 34. Herein, the optical fiber Bragg grating-based sensor has a measurement range of 0 ° to 360 °, an accuracy of 5 ° or less, and a resolution of 4 ° to 6 °.

That is, the magnet 37 fixed to the end of the first support 35 is rotated (rotated) in conjunction with the rotational movement of the wind direction rotary column 33, the end of the third support 36 The magnet 37 fixed thereto is rotated (rotated) in conjunction with the rotational operation of the wind speed rotation column 34.

The tension applying portion 39 linearly reciprocates in accordance with the change in the magnetic force of the magnet 37 due to the rotation (rotation).

At this time, the optical fiber Bragg grating-based sensor according to the third embodiment senses the wavelength shift generated according to the tension degree of the optical fiber Bragg grating 410 that is changed in proportion to the linear reciprocating motion of the tension applying unit 39, the wind direction rotation The rotational movement of the pillar 33 and the wind speed rotating column 34 is sensed. For example, as shown in FIG. 8, in which λ ₄ and λ ₅ each have a wavelength shift with Δλ ₄ and Δλ ₅ , the wavelength shift is sensed, thereby sensing the rotational operation of the wind direction rotating column 33.

Here, in the optical fiber Bragg grating-based sensor according to the third embodiment, when the magnet 37 is located between different directions as shown in FIG. .

In addition, in the optical fiber Bragg grating based sensor according to the third embodiment, since the optical fiber Bragg grating closest to the magnet 37 changes the most, the wavelength shift size can be measured as a relative comparison value. For example, the wind direction may be measured even with the wavelength shift data.

As described above, the wind direction / wind speed measuring device measures the wind direction by the position of the magnet 37 fixed to the end of the first support 35, and measures the wind speed by counting the rotation of the wind speed rotation column 34.

As described above, the optical fiber Bragg grating-based sensor and the measuring device using the same according to the third embodiment includes a magnet portion for varying the degree of tension of the optical fiber Bragg grating, according to the tension degree of the optical fiber Bragg grating variable by the magnetic force change of the magnet portion It detects changes in the wavelength of light passing through the optical fiber and observes weather conditions such as precipitation, wind direction, and wind speed, so it is easy to install in the field where power supply is difficult because power supply equipment is not required at the observation site, and the power consumption reduction effect is large. Economics can be improved.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various changes, modifications, and substitutions can be made within the scope of the technical idea of the present invention.

  {Description of the sign}

1 magnet 2,21,41 optical fiber

2a Fiber Bragg Grating 3,13 Rotating Shaft

5 rotating body 7,17,37 magnet

9,19,39 Tension Applicator 11 Tipping Bucket

10 Fiber Bragg Grating Based Sensor

31 Wind direction / wind rotation part 33 Wind direction rotation pillar

34 Wind turbine 38 Counterweight

91,191,391 Moving shaft 93,193,393 Magnet detecting part

95,195,395 Slide Guide 97,197,397 Elastic Member

99,199,399 tensile strength changing member

Claims (6)

1. With optical fiber,

   An optical fiber Bragg grating formed in a part of the optical fiber,

   Tension applying means arranged to apply tension to the optical fiber Bragg grating;

   It includes a magnet unit for driving the tension applying means,

   The tension applying means is a fiber Bragg grating-based sensor to change the wavelength of the light passing through the optical fiber Bragg grating by modifying the optical fiber Bragg grating by driving when the distance to the magnet portion is within a predetermined distance to apply the tension to the fiber Bragg grating .
2. The method according to claim 1,

   The magnet unit,

   Pivot axis,

   A rotating body rotating around the rotating shaft,

   A magnet disposed at an opposite end of the pivot axis of the pivot,

   And the distance between the tension applying means and the magnet is closer or farther within a predetermined distance as the pivot rotates about the pivot axis.
3. The method according to claim 2,

   The tension applying means,

   A moving shaft moving in the rotational axis direction when the distance between the tension applying means and the magnet portion approaches within a predetermined distance;

   A tensile strength changing member for applying the tension to the optical fiber Bragg grating while interlocking with the moving shaft;

   And an elastic member for regulating the moving distance of the moving axis in the rotational axis direction to be within a predetermined distance.
4. With precipitation measuring device,

   In response to rainfall falling per unit time, the seesaw operation is carried out with a tipping bucket,

   An optical fiber Bragg grating based sensor for detecting the seesaw motion of the tipping bucket;

   The optical fiber Bragg grating based sensor is the optical fiber Bragg grating based sensor according to any one of claims 1 to 3,

   And a magnet unit pivoting in conjunction with the seesaw operation of the tipping bucket so that a distance between the tension application unit and the magnet unit is varied.
5. With wind direction measuring device,

   Wind vane that rotates in the direction of the wind blowing,

   An optical fiber Bragg grating based sensor for detecting the rotation of the wind vane,

   The optical fiber Bragg grating based sensor is the optical fiber Bragg grating based sensor according to any one of claims 1 to 3,

   And a distance between the tension applying means and the magnet part is varied by rotating the magnet part in conjunction with rotation of the wind vane.
6. With wind speed measuring device,

   Wind wave member which rotates according to wind speed,

   An optical fiber Bragg grating based sensor for detecting the rotation of the wind distribution member,

   The optical fiber Bragg grating based sensor is the optical fiber Bragg grating based sensor according to any one of claims 1 to 3,

   And a distance between the tension applying means and the magnet part is varied by rotating the magnet part in conjunction with rotation of the wind distribution member.

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