CN210154576U - A Self-Temperature Compensation Fiber Bragg Grating Leveling Inclinometer - Google Patents

Abstract

The utility model relates to a self-temperature compensation fiber grating level inclinometer and an inclination calculation method; belongs to the field of automatic detection technical equipment. The first leveling and inclination measuring device and the second leveling and inclination measuring device are respectively provided with a buoyancy displacement leveling device; the first leveling and inclination measuring device and the second leveling and inclination measuring device are arranged on the measured piece; after the measured piece inclines, buoyancy displacement leveling devices in the first leveling and inclination measuring device and the second leveling and inclination measuring device send the measured inclination deviation value to an external terminal; the measurement of the inclination and the levelness among multiple points in the area range is realized by increasing the number of the leveling elements. The utility model provides a self-temperature compensation fiber grating level inclinometer which can be placed on any tested piece for testing and realizes the simultaneous measurement of level and a direction-recognizable inclination angle; the design of the modularized leveling inclination measurement element is convenient for realizing the measurement of the inclination and the levelness among multiple points in the area.

Description

A Self-Temperature Compensation Fiber Bragg Grating Leveling Inclinometer

technical field

The utility model relates to a self-temperature-compensating fiber grating level inclinometer, which belongs to the field of automatic detection technology and equipment.

Background technique

Leveling measurement, also known as "geometric leveling", is a method of measuring the height difference between two points on the ground with a level and a leveling rod. By placing a leveling instrument between two points on the ground, observing the leveling rod erected on the two points, and reading according to the ruler. Calculate the height difference between two points. However, in the process of leveling, the verticality of the leveling rod is the guarantee of the leveling accuracy. At present, the existing patents (CN201711101080, CN201721497643) have not made corresponding research on the measurement of inclination in the leveling process.

Utility model content

The utility model provides a self-temperature compensating fiber grating leveling inclinometer and an inclination calculation method aiming at the existing technical vacancy.

The utility model adopts the following technical solutions:

The self-temperature-compensated fiber grating leveling inclinometer provided by the utility model comprises a first leveling inclinometer device, a second leveling inclinometer device, and a communication device; the first leveling inclinometer device and the second leveling inclinometer device are communicated with each other;

The first leveling inclinometer device and the second leveling inclinometer device are respectively provided with buoyancy displacement calibrating devices;

The first leveling inclinometer device and the second leveling inclinometer device are arranged on the measured object; when the measured object is inclined, the buoyancy displacement calibration device in the first leveling inclinometer device and the second leveling inclinometer device will measure the deviation. The tilt value is sent to an external terminal. By increasing the number of leveling inclinometers, the measurement of inclination and leveling between multiple points in the area can be realized.

The self-temperature-compensating fiber grating leveling inclinometer according to the utility model, the leveling inclinometer device includes a communication liquid input port, a support fixture, a casing, a communication liquid, an optical fiber signal output port, a buoy, and a fiber grating. FBG II, FBG III, FBG IV;

A buoy is arranged in the center of the casing, and one end of the first fiber grating, the second fiber grating, and the third fiber grating are connected to the buoy; connected;

The fourth fiber grating is perpendicular to the first fiber grating, the second fiber grating and the third fiber grating, and one end is connected to the buoy, and the other end of the fourth fiber grating is connected to the inner top wall of the housing; the first fiber grating, the fiber grating 2. Fiber Bragg Grating 3 and Fiber Bragg Grating 4 The included angle between the adjacent fiber gratings is 120°.

The outer casing is provided with an optical fiber signal output port, and the first fiber grating, the second fiber grating, the third fiber grating, and the fourth fiber grating transmit signals through the fiber signal output port;

The outer wall of the outer casing is provided with a communication liquid input port, the communication liquid input port is communicated with the inner casing, and the outer casing is filled with the communication liquid;

In the self-temperature-compensating fiber grating level inclinometer of the utility model, the first fiber grating, the second fiber grating, the third fiber grating, and the fourth fiber grating are connected with the buoy through elastic elements; the first fiber grating or the fiber grating 2 or fiber grating 3 or fiber grating 4 and the elastic element are arranged coaxially;

The first fiber grating, the second fiber grating, and the third fiber grating are placed horizontally.

In the self-temperature compensating fiber grating leveling inclinometer according to the utility model, the second leveling inclinometer device comprises a liquid input port, a support fixture, a casing, a communication liquid, an optical fiber signal output port, and a buoy. , fiber grating five, fiber grating six, fiber grating seven, fiber grating eight;

A buoy is arranged in the center of the casing 1, one end of the fiber grating 5, the fiber grating 6, and the fiber grating 7 are respectively connected with the buoy 1, and the other ends of the fiber grating 5, the fiber grating 6, and the fiber grating 7 are respectively shells. The inner walls of one are connected;

The fiber grating eight is perpendicular to the fiber grating five, the fiber grating six, and the fiber grating seven, and one end is connected with the buoy one, and the other end of the fiber grating eight is connected with the inner top wall of the housing one; the fiber grating five, The angle between the adjacent fiber gratings of fiber grating VI, fiber grating seven, and fiber grating eight is all 120°.

The outer casing 1 is provided with a fiber signal output port 1, and fiber grating 5, fiber grating 6, fiber grating 7, and fiber grating 8 transmit signals through the fiber signal output port 1;

The bottom end of the first shell is provided with a supporting and fixing piece 1, and the first shell is filled with a communication liquid;

In the self-temperature-compensated fiber grating leveling inclinometer according to the utility model, the fiber grating five, the fiber grating six, the fiber grating seven, the fiber grating eight and the buoy one are connected through the elastic element one; Fiber grating six or fiber grating seven or fiber grating eight and element one are arranged coaxially;

The fifth fiber grating, the sixth fiber grating, and the seventh fiber grating are placed horizontally.

In the self-temperature compensating fiber grating leveling inclinometer of the utility model, the leveling inclinometer device is connected with a plurality of calibrating mechanisms.

The tilt calculation method of the self-temperature-compensated fiber grating level inclinometer according to the utility model; the calculation method is as follows:

Step 1. Arrange the leveling inclinometer on the measured part;

Step 2. When the leveling inclinometer is in a vertical state, under the action of the buoy, the axial strain values generated between the elastic element and the horizontal fiber gratings connected to it are respectively recorded as ε ₁₀ (f) and ε ₂₀ (f ) and ε ₃₀ (f), resulting in a change in the center wavelength of the fiber grating, which is recorded as Δλ ₁₀ (f), Δλ ₂₀ (f) and Δλ ₃₀ (f); it is calculated by the following formula:

△λ ₁₀ (f)=K _ε ε ₁₀ (f)+(ξ+a)△T (1)

△λ ₂₀ (f)=K _ε ε ₂₀ (f)+(ξ+a)△T (2)

△λ ₃₀ (f)=K _ε ε ₃₀ (f)+(ξ+a)△T (3)

In the formula, ΔT is the variation of the measured ambient temperature, K _ε is the strain sensitivity of the grating under the elastic diaphragm, ξ is the thermo-optic coefficient of the fiber grating, and α is the thermal expansion coefficient of the fiber;

Step 3. When the leveling inclinometer is in an inclined state, under the action of the buoy, the elastic element and the horizontal fiber gratings connected to it generate axial strain values of ε ₁ (f), ε ₂ (f) and ε ₃ ( f), resulting in a change in the center wavelength of each fiber grating, and the amount of change is recorded as Δλ ₁ (f), Δλ ₂ (f) and Δλ ₃ (f); it is calculated by the following formula:

△λ ₁ (f)=K _ε ε ₁ (f)+(ξ+a)△T (4)

△λ ₂ (f)=K _ε ε ₂ (f)+(ξ+a)△T (5)

△λ ₃ (f)=K _ε ε ₃ (f)+(ξ+a)△T (6)

In the formula, ΔT is the change of the measured ambient temperature, K _ε is the strain sensitivity of the grating under the elastic diaphragm, ξ is the thermo-optic coefficient of the fiber grating, and α is the thermal expansion coefficient of the fiber.

Step 5. The axial strain ε ₁₁ (f), ε ₂₁ (f) and ε ₃₁ (f) obtained by the above formula are brought into the strain vector diagram, and the leveling inclinometer element can be obtained by calculating the vector strain combination. The inclination angle and its azimuth information, so as to realize the measurement of discernible inclination angle.

The tilt calculation method of the self-temperature compensating fiber grating leveling inclinometer according to the present utility model comprises four levels _h1 of the fiber grating and eight levels h2 of the fiber grating in the first leveling inclinometer and the _second leveling inclinometer; The differential axial strain forces under the applied force are respectively denoted as ε ₄ (f) and ε ₈ (f), and the change in the center wavelength of the fiber grating four and the eighth fiber grating are respectively denoted as: Δλ ₄ (f) , Δλ ₈ (f); expressed as the following formula:

△λ ₄ (f)=K _ε ε ₄ (f)+(ξ+a)△T=K _ε ·F(h ₁ )+(ξ+a)△T (10)

△λ ₈ (f)=K _ε ε ₈ (f)+(ξ+a)△T=K _ε ·F(h ₂ )+(ξ+a)ΔT (11)

According to the above two formulas, it is

Δh=h ₂ -h ₁ =F ^-1 ((Δλ ₈ (f)-Δλ ₄ (f))/K _ε )

In the formula, F is the conversion function between the leveling height and the axial strain of the fiber grating, ΔT is the change of the measured ambient temperature, Kε is the strain sensitivity of the grating under the elastic diaphragm, ξ is the thermo-optic coefficient of the fiber grating, α is the fiber Δh is the height difference between the leveling inclinometer element 1 and the leveling inclinometer element 2, that is, the relative level between the two leveling inclinometer elements; obtain the relative level between the leveling inclinometer device 1 and the leveling inclinometer device 2 level.

beneficial effect

The self-temperature-compensating fiber grating leveling inclinometer provided by the utility model can be placed on any measured piece for testing, and realizes simultaneous measurement of level and discernible inclination angle; Realize the measurement of inclination and leveling between multiple points in the area.

The self-temperature-compensating fiber grating leveling inclinometer tilt calculation method provided by the utility model can calculate the measurement of the inclination angle of the discernible direction and the leveling measurement, and fill up the vacancy if the measurement is insufficient.

Description of drawings

Fig. 1 is the structural representation of the self-temperature compensating fiber grating level inclinometer of the present invention;

Fig. 2 is the strain vector diagram of the measuring method adopted by the self-temperature compensating fiber grating level inclinometer of the utility model;

3 is a schematic structural diagram of the buoy and the fiber grating in the self-temperature compensating fiber grating leveling inclinometer of the present invention.

In the figure, 101-connecting fluid input port, 102-supporting and fixing member, 103-shell, 104-connecting fluid, 105-fiber signal output port, 106-buoy, 107-fiber grating one, 108-fiber grating two, 109- Fiber grating three, 110- elastic element, 111- fiber grating four;

201-connecting fluid input port one, 202-supporting fixture one, 203-shell one, 204-connecting fluid, 205-fiber signal output port one, 206-buoy one, 207-fiber grating five, 208-fiber grating six, 209-fiber grating seven, 210- elastic element one, 211-fiber grating eight, 3-connected element.

Detailed ways

In order to make the purposes and technical solutions of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some, but not all, embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

As shown in Figure 1: The self-temperature compensating fiber grating leveling inclinometer includes a leveling inclinometer component 1, a leveling inclinometer component 2 and a connecting component 3. The first leveling inclinometer and the second leveling inclinometer have the same structure and are communicated with each other through the connecting element 3; by increasing the number of leveling inclinometers, the measurement of inclination and leveling between multiple points in the area can be realized. The purpose of the multiple communication ports is to provide an interface for building a regional measurement network for inclination and leveling.

The first leveling inclination measuring element in the present invention consists of a communication liquid input port 101, a support fixture 102, a casing 103, a communication liquid 104, an optical fiber signal output port 105, a buoy 106, a fiber grating one 107, a fiber grating two 108, and a fiber grating Three 109, four fiber gratings 111 and elastic elements 110 are composed.

The communication liquid input port 101 is mainly used to realize the input and output of the communication liquid between multiple leveling and inclinometer elements; the element support fixture 102 is used to realize the fixed connection between the first leveling inclinometer element and the measured part; the optical fiber signal output port 105 is used to realize the input and output of the first, second, third, and fourth signals of the fiber grating; the fiber signal output port 105 is used to provide a connection channel for the fiber pigtail outside the sensor and the fiber pigtail inside the sensor, and the fiber pigtail realizes the fiber grating signal. transmission.

The buoy 106 can change with the change of the liquid level of the communication liquid 104, and can also realize the pre-stretching effect on the elastic element 110 to reduce the zero point measurement error of the present invention; 109 is used to measure the inclination angle of distinguishable directions; FBG four 111 interacts with FBG eight 211 to measure leveling; FBG one 107, FBG two 108, FBG three 109 and FBG four 111 and elasticity The axes of the elements 110 are on the same line.

The fiber grating four 111 interacts with the fiber grating eight 211 to realize the leveling measurement. When the leveling degree of the leveling inclinometer element 1 and the leveling inclinometer element 2 are different, the change of the center wavelength of the fiber grating 4 111 and the fiber grating 8 211 under the action of the buoy 106 is different, and then the leveling degree can be realized through joint calculation. Measurement.

One end of the fiber grating 107 , the second fiber grating 108 , the third fiber grating 109 , and the fourth fiber grating 111 are connected to the inner surface of the housing 103 of the inclination measuring element, and the other end is connected to the buoy 106 ;

Fiber grating four is perpendicular to fiber grating one 107, fiber grating two 108 and fiber grating three 109, and one end is connected to the buoy, and the other end of fiber grating four 111 is connected to the inner top wall of the housing; the fiber grating one 107, Fiber grating two 108, fiber grating three 109, fiber grating four 111 and the included angle between their adjacent fiber gratings are all 120°;

The connection points of FBG 1 107 , FBG 2 108 , FBG 3 109 , and FBG 4 111 and the inner surface of the housing 103 form a regular tetrahedron, and the buoy 106 is located at the center point of the regular tetrahedral housing.

The middle level inclination measuring element of the utility model is composed of a communication liquid input port 1 201, a support fixing member 1 202, a housing 1 203, a communication liquid, an optical fiber signal output port 1 205, a buoy 1 206, a fiber grating five 207, and a fiber grating six 208 , fiber grating seven 209, elastic element one 210 and fiber grating eight 211.

Among them: the communication liquid input port 1 201 is mainly used to realize the input and output of the communication liquid between multiple leveling and inclinometer elements; the element supporting and fixing member 1 202 is used to realize the fixed connection between the second leveling inclinometer element and the measured part; the optical fiber The signal output port 1 205 is used to realize the input and output of the fifth, sixth, seventh and eighth signals of the fiber grating; the buoy 1 206 can change with the change of the connected liquid level, and can also realize the pre-stretching effect on the elastic element 1 210 Thereby, the zero point measurement error of the present invention is reduced; the fiber grating five 207, the fiber grating six 208 and the fiber grating seven 209 are used to realize the measurement of the inclination angle of the discernible direction; Measurement.

One end of fiber grating five 207, fiber grating six 208, fiber grating seven 209, and fiber grating eight 211 is connected with the inner surface of shell one 203, and the other end is connected with buoy one 206;

The fiber grating eight is perpendicular to the fiber grating five 207, the fiber grating six 208, and the fiber grating seven 209, and one end is connected with the buoy one 206, and the other end of the fiber grating eight 211 is connected with the inner top wall of the housing one 203; The fiber grating five 207, the fiber grating six 208, the fiber grating seven 209, and the fiber grating eight 211 are all 120° in included angle between their adjacent fiber gratings.

Fiber grating five 207, fiber grating six 208, fiber grating seven 209, fiber grating eight 211 and the inner surface of shell one 203 form a regular tetrahedron, and buoy one 206 is located at the center point of the regular tetrahedron shell.

The communication element 3 of the present invention is mainly used to realize the mutual circulation of the communication liquid among a plurality of leveling inclination measuring elements, so as to realize the measurement of the level.

2) Measurement of discernible inclination angle

Taking the leveling inclinometer element 1 as an example, when it is in a vertical state, under the action of the buoy 106, the elastic element 110 generates strain values in the axial direction of the fiber grating one 107, the fiber grating two 108 and the fiber grating three 109, respectively: ε ₁₀ (f), ε ₂₀ (f) and ε ₃₀ (f), resulting in fiber grating one 107, fiber grating two 108 and fiber grating three 109 center wavelength changes are Δλ ₁₀ (f), Δλ ₂₀ (f) and Δλ ₃₀ (f) can be expressed as:

△λ ₁₀ (f)=K _ε ε ₁₀ (f)+(ξ+a)△T (1)

△λ ₂₀ (f)=K _ε ε ₂₀ (f)+(ξ+a)ΔT (2)

Δλ ₃₀ (f)=K _ε ε ₃₀ (f)+(ξ+a)ΔT (3)

In the formula, ΔT is the change of the measured ambient temperature, K _ε is the strain sensitivity of the grating under the elastic diaphragm, ξ is the thermo-optic coefficient of the fiber grating, and α is the thermal expansion coefficient of the fiber.

When it is in the inclined state, under the action of the buoy 106, the elastic element 110 produces strain values in the axial direction of the fiber grating 1 107, the fiber grating 2 108 and the fiber grating 3 109, respectively ε ₁ (f) and ε ₂ (f) and ε ₃ (f), resulting in fiber grating one 107, fiber grating two 108 and fiber grating three 109 center wavelength changes as Δλ ₁ (f), Δλ ₂ (f) and Δλ ₃ (f) can be expressed as:

Δλ ₁ (f)=K _ε ε ₁ (f)+(ξ+a)ΔT (4)

Δλ ₂ (f)=K _ε ε ₂ (f)+(ξ+a)ΔT (5)

Δλ ₃ (f)=K _ε ε ₃ (f)+(ξ+a)ΔT (6)

In the formula, ΔT is the change of the measured ambient temperature, K _ε is the strain sensitivity of the grating under the elastic diaphragm, ξ is the thermo-optic coefficient of the fiber grating, and α is the thermal expansion coefficient of the fiber.

Therefore, according to equations (1) to (6), when the leveling inclinometer element 1 changes from the vertical state to the inclined state, the axial strain of the fiber grating 1 107 , the fiber grating 2 108 and the fiber grating 3 109 is caused by the buoy 106 . are ε ₁₁ (f), ε ₂₁ (f) and ε ₃₁ (f), which can be expressed as:

ε ₁₁ (f)=(△λ ₁ (f)-△λ ₁₀ (f))/K _ε (7)

ε ₂₁ (f)=(△λ ₂ (f)-△λ ₂₀ (f))/K _ε (8)

ε ₃₁ (f)=(Δλ ₃ (f)-Δλ ₃₀ (f))/K _ε (9)

From equations (6) to (9), it can be obtained that the axial strains ε ₁₁ (f), ε ₂₁ (f) and ε ₃₁ (f) of fiber grating one 107 , fiber grating two 108 and fiber grating three 109 are The difference between the inclined and vertical states is calculated, so it is not affected by the measured ambient temperature change ΔT, so as to achieve the effect of self-temperature.

Furthermore, the axial strains ε ₁₁ (f), ε ₂₁ (f) and ε ₃₁ (f) obtained from equations (6) to (9) are brought into the strain vector diagram as shown in Fig. 2. The method can obtain the inclination angle and azimuth information of the first leveling inclinometer element, so as to realize the measurement of the discernible inclination angle.

In the second leveling inclinometer element, the measurement and calculation method in the first leveling inclinometer element is used to measure and obtain corresponding information.

3) Leveling measurement

Assuming that the level height of the first leveling inclinometer element is h ₁ , and the level height of the leveling inclinometer element 2 is h ₂ , at this time, the buoy 106 and the buoy 1 206 are connected in the communication liquid 104 with the height h ₁ and the height h ₂ Under the force of the liquid, the axial direction of the fiber grating 4 111 and the fiber grating 8 211 produces strains as ε ₄ (f) and ε ₈ (f), and then the center wavelength change of the fiber grating 4 111 and the fiber grating 8 211 is Δλ ₄ (f), Δλ ₈ (f) can be expressed as:

△λ ₄ (f)=K _ε ε ₄ (f)+(ξ+a)△T=K _ε ·F(h ₁ )+(ξ+a)△T (10)

Δλ ₈ (f)=K _ε ε ₈ (f)+(ξ+a)ΔT=K _ε ·F(h ₂ )+(ξ+a)ΔT (11)

In the formula, F is the conversion function between the leveling height and the axial strain of the fiber grating, ΔT is the variation of the measured ambient temperature, K _ε is the strain sensitivity of the grating under the elastic diaphragm, ξ is the thermo-optic coefficient of the fiber grating, and α is The thermal expansion coefficient of the fiber.

Furthermore, from equations (10) and (11), we can get:

Δh=h ₂ -h ₁ =F ^-1 ((Δλ ₈ (f)-Δλ ₄ (f))/K _ε ) (12)

In the formula, Δh is the height difference between the first leveling inclinometer element and the second leveling inclinometer element, that is, the relative level between the two leveling inclinometer elements.

The measurement of the inclination angle of the distinguishable direction and the leveling measurement can show that the utility model has the characteristics of self-temperature compensation, and can realize the measurement of the inclination angle and the leveling degree of the distinguishable direction. The quantity can realize the simultaneous measurement of multi-point leveling and inclination angle in the area.

The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited to this. The changes or replacements should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (6)

1. a self-temperature compensating fiber grating leveling inclinometer, is characterized in that: comprise leveling inclinometer one, leveling inclinometer two, communication device; Between described leveling inclinometer one and leveling inclinometer two interconnected; The first leveling inclinometer device and the second leveling inclinometer device are respectively provided with buoyancy displacement calibrating devices; The first leveling inclinometer device and the second leveling inclinometer device are arranged on the measured object; when the measured object is inclined, the buoyancy displacement calibration device in the first leveling inclinometer device and the second leveling inclinometer device will measure the deviation. The inclination value is sent to the external terminal; by increasing the number of leveling inclinometers, the measurement of inclination and leveling between multiple points in the area can be realized. 2. The self-temperature-compensating fiber grating leveling inclinometer according to claim 1, wherein the leveling inclinometer one comprises a communication liquid input port, a support fixture, a casing, a communication liquid, and an optical fiber signal output port , buoy, fiber grating one, fiber grating two, fiber grating three, fiber grating four; A buoy is arranged in the center of the casing, and one end of the first fiber grating, the second fiber grating, and the third fiber grating are connected to the buoy; connected; The fourth fiber grating is perpendicular to the first fiber grating, the second fiber grating and the third fiber grating, and one end is connected to the buoy, and the other end of the fourth fiber grating is connected to the inner top wall of the housing; the first fiber grating, the fiber grating 2. The angle between the adjacent fiber gratings of fiber grating 3 and fiber grating 4 is 120°; The outer casing is provided with an optical fiber signal output port, and the first fiber grating, the second fiber grating, the third fiber grating, and the fourth fiber grating transmit signals through the fiber signal output port; The outer wall of the outer casing is provided with a communication liquid input port, the communication liquid input port is communicated with the inner casing, and the outer casing is filled with the communication liquid; 3. The self-temperature compensating fiber grating leveling inclinometer according to claim 2, characterized in that: the junctions of the first fiber grating, the second fiber grating, the third fiber grating, and the fourth fiber grating and the buoy are connected by elastic elements ; FBG 1 or FBG 2 or FBG 3 or FBG 4 are arranged coaxially with the elastic element; The first fiber grating, the second fiber grating, and the third fiber grating are placed horizontally. 4. The self-temperature compensating fiber grating leveling inclinometer according to claim 1, wherein the second leveling inclinometer comprises a liquid input port one, a support fixture, a housing one, a communication liquid, and an optical fiber. Signal output port one, buoy one, fiber grating five, fiber grating six, fiber grating seven, fiber grating eight; A buoy is arranged in the center of the casing 1, one end of the fiber grating 5, the fiber grating 6, and the fiber grating 7 are respectively connected with the buoy 1, and the other ends of the fiber grating 5, the fiber grating 6, and the fiber grating 7 are respectively shells. The inner walls of one are connected; The fiber grating eight is perpendicular to the fiber grating five, the fiber grating six, and the fiber grating seven, and one end is connected with the buoy one, and the other end of the fiber grating eight is connected with the inner top wall of the housing one; the fiber grating five, The angle between the adjacent fiber gratings of fiber grating six, fiber grating seven, and fiber grating eight is all 120°; The outer casing 1 is provided with a fiber signal output port 1, and fiber grating 5, fiber grating 6, fiber grating 7, and fiber grating 8 transmit signals through the fiber signal output port 1; The bottom end of the first shell is provided with a supporting and fixing piece 1, and the first shell is filled with a communication liquid; 5. The self-temperature compensating fiber grating leveling inclinometer according to claim 4, characterized in that: the connection between the fiber grating five, the fiber grating six, the fiber grating seven, the fiber grating eight and the buoy one passes through an elastic element One is connected; the fiber grating five or the fiber grating six or the fiber grating seven or the fiber grating eight is arranged in a coaxial manner; The fifth fiber grating, the sixth fiber grating, and the seventh fiber grating are placed horizontally. 6 . The self-temperature compensating fiber grating leveling inclinometer according to claim 1 , wherein the leveling inclinometer is assembled with a plurality of alignment mechanisms by connecting the device. 7 .

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