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Tilt angle sensor based on optical fiber Bragg gratings and method for measuring tilt angle of tilt angle sensor

An optical fiber Bragg and inclination sensor technology, which is used in measuring devices, measuring inclinations, instruments, etc., can solve the problems of continuity, real-time performance and measurement sensitivity that cannot meet monitoring requirements, cannot expand the range of detection, and limit the practical application of sensors. , to achieve the effect of improving design flexibility, small residual strain, and easy replacement

Inactive Publication Date: 2013-03-13
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solid pendulum angle sensor has a definite pendulum length and pendulum center, and the practical product type is mostly electromagnetic pendulum type, which has a high measurement range, precision and anti-overload ability, and is widely used in engineering, but it is susceptible to Electromagnetic interference, and it is increasingly difficult to meet today's monitoring requirements in terms of continuity, real-time and measurement sensitivity
[0003] Research scholars of Huazhong University of Science and Technology [Wu Xianzhi, Ren Weixin, "Development of a new fiber grating inclination sensor", Journal of Huazhong University of Science and Technology, 25(4), 332-334(2008)] proposed a method for civil engineering Compared with traditional mechanical and electromagnetic measurement methods, the fiber grating inclination measurement method for monitoring has improved the design cost and structural complexity to a certain extent, but this method still has the following technical problems and defects: ① Since the pendulum directly It is sleeved on the shaft, and the inclination measurement is realized through the deflection around the shaft. However, in actual inclination measurement, especially in occasions where high measurement accuracy is required, the friction between the pendulum and the shaft and the fixing method of the pendulum and the strain beam are different. It will bring a large uncertainty error to the measurement, which limits the practical application of the sensor; ②Due to the limitation of measurement sensitivity, the sensor is only suitable for small angle measurement, and cannot expand the range detection range according to actual engineering needs

Method used

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  • Tilt angle sensor based on optical fiber Bragg gratings and method for measuring tilt angle of tilt angle sensor
  • Tilt angle sensor based on optical fiber Bragg gratings and method for measuring tilt angle of tilt angle sensor
  • Tilt angle sensor based on optical fiber Bragg gratings and method for measuring tilt angle of tilt angle sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The thin-walled equal-section metal beam 9 is made of beryllium bronze with good elasticity and toughness, and its modulus of elasticity is E=131GPa. The upper end of the beryllium bronze is fixed on the fixed bottom plate by the fixed briquetting block 6 and the first movable briquetting block 10 On 12, the lower end of the thin-walled equal-section metal beam 9 is closely connected with the mass block 17 through the second movable pressing block 16 and the sixth screw 15. The length of the beryllium bronze is L=52mm, the width is a=6mm, and the thickness is b= 1.5mm, mass block 17 adopts cylindrical brass with high density, and its mass m=0.1kg. When the structure deviates from the vertical plane to produce an inclination angle, the external force load produced by the mass block 17 makes the strain at the lower end L2=9mm of the thin-walled equal-section metal beam 9 change, and then the optical fiber Bragg grating stuck there Stretching causes the center wavelength t...

Embodiment 2

[0064] Similar to Embodiment 1, the difference is that the width of the thin-walled equal-section metal beam becomes b=8mm, and the sensor inclination response curve obtained from the experiment is as follows Figure four shown by Figure four It can be seen that after increasing the width of the thin-walled equal-section metal beam, the sensor has a linear range of 0-80°, that is, increasing the width of the thin-walled equal-section metal beam reduces the sensitivity of the sensor and expands the inclination detection of the sensor range, so that it can be effectively applied to the application requirements of different engineering environments.

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Abstract

The invention relates to a tilt angle sensor based on optical fiber Bragg gratings and a method for measuring a tilt angle of the tilt angle sensor and belongs to the technical field of measurement of a structural tilt angle. The tilt angle sensor comprises a fixed base plate (12), a fixed pressing block (6), a thin-wall type uniform-section metal beam (9) and a quality block (7), wherein the upper end of the thin-wall type uniform-section metal beam (9) is arranged on the fixed base plate (12) in a mode of fitting with the fixed pressing block through a first movable pressing block (10) and a fifth screw (11); the quality block (7) is fixed at the lower end of the thin-wall type uniform-section metal beam (9) through a sixth screw (15) and a second movable pressing block (16); and a first optical fiber Bragg grating (13) and a second optical fiber Bragg grating (14) are respectively adhered to opposite positions on two sides of the thin-wall type uniform-section metal beam (9). By the method, the size and direction of the tilt angle can be detected according to a correspondence relation between the change of central wavelengths of the two optical fiber Bragg gratings and the tiltangle. The invention is high in measurement accuracy and has a temperature self-compensation function.

Description

technical field [0001] The invention relates to an inclination sensor based on a fiber Bragg grating and an inclination measuring method thereof, belonging to the technical fields of structural inclination measurement and optical fiber sensing. Background technique [0002] At present, the inclination sensor can be divided into three types: gas pendulum type, liquid pendulum type and solid pendulum type in terms of working principle. The gas pendulum type has strong anti-vibration or impact ability, but the gas motion control is more complicated, and the measurement accuracy is not high. The liquid pendulum type inclination sensor system is stable and widely used in high-precision systems, but the measurement range is small and the requirements for the measurement environment are relatively high. The solid pendulum angle sensor has a definite pendulum length and pendulum center, and the practical product type is mostly electromagnetic pendulum type, which has a high measure...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C9/12
Inventor 曾捷孙玮梁大开叶婷张少华
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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