A high-temperature-resistant dual-axis fiber grating vibration sensor

A vibration sensor, fiber grating technology, applied in instruments, measuring devices, using wave/particle radiation and other directions, can solve the problems of low sensitivity, inconsistent vibration directions of the main beam, and difficult to distinguish the direction of the main beam, so as to improve accuracy, improve Efficiency, Effect of Solving Temperature Drift

Active Publication Date: 2020-08-11
山东双测安全信息技术产业研究院有限公司
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  • Claims
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AI Technical Summary

Problems solved by technology

Because the vibration of this fiber grating sensor only causes the central wavelength of one grating to drift, it can only detect vibration signals in one direction and has low sensitivity; its structure is cylindrical, and the direction of the main beam is difficult to distinguish when used, which may easily cause the main beam to be distorted. The vibration is inconsistent with the vibration direction of the actual object; the patent does not explain the arrangement of the beams, and these factors are likely to cause the grating to chirp and cause the sensor to fail to work normally; the patent does not explain the applicable temperature range of the sensor

Method used

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  • A high-temperature-resistant dual-axis fiber grating vibration sensor
  • A high-temperature-resistant dual-axis fiber grating vibration sensor

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Experimental program
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Effect test

Embodiment 1

[0020] from figure 1 It can be seen that the high-temperature-resistant dual-axis fiber grating vibration sensor of this embodiment includes a sealing cover nut 1, a sealing cover 2, a mass block 3, a sensing fiber grating pigtail 4, a sensing fiber grating grating area 5, and an equal-strength cantilever Beam 6, cantilever beam fixing nut 7 with equal longitudinal strength, connecting optical fiber 8, housing 9, fiber protection sleeve fixing nut 10, fiber protection sleeve 11, sensor fixing nut 12, base 13, cantilever beam fixing nut 14 with transverse equal strength.

[0021] like figure 1 As shown, a base 13 is provided at the inner center of the housing 9 of the sensor, and the housing 9 and the base 13 are integrally stamped or welded to the center of the housing 9 . There are four equal-strength cantilever beams 6 with the same material and structural parameters on the four sides of the base 13. The spatial positions of the equal-strength cantilever beams 6 are biaxial...

Embodiment 2

[0023] In this embodiment, the central wavelength of the transverse sensing fiber grating is the same, and the central wavelength of the longitudinal sensing fiber grating is the same. The sensing fiber grating grid area 5 is written point by point using a fiber femtosecond laser, the central wavelength is 1519.99nm, and the length of the grid area is 4.7 mm, the reflectivity is 78.6%, the 3dB bandwidth is 0.375nm, and the coating layer of the sensing fiber grating is coated with polyimide.

Embodiment 3

[0025] In this embodiment, the equal-strength cantilever beam 6 is made of high-elastic alloy. The thickness of the equal-strength cantilever beam 6 is 0.5 mm, the width of the free end is 2 mm, the width of the fixed end is 15 mm, and the length is 20 mm. The radius of mass block 3 is 5mm, and the thickness is 3mm.

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Abstract

The invention provides a high-temperature resistant biaxial optical fiber grating vibration sensor, and belongs to the field of the sensor. A sealing cover is arranged at an opening at an upper side of a shell of the sensor, an optical fiber metal protective sleeve is arranged at each side of the shell, and the optical fiber metal protective sleeve is clamped and fixed by using a nut; a base is arranged in the shell, four cantilever beams with same strength are arranged on the base; two cantilever beams with same strength are arranged at two sides of each axial direction by taking the base center as the original point, the cantilever beams with same strength are mutually and symmetrically arranged on two directions of the horizontal axis and the longitudinal axis of the base in pair, a mass block is arranged at the tail end of each equal-strength cantilever beam; an optical fiber Bragg grating is arranged on each equal-strength cantilever beam, high-temperature resistant ceramic adhesive or high-temperature resistant resin mixed adhesive is used for fixing the optical fiber grating on the equal-strength cantilever beam, the optical fiber at the tail end of the optical fiber Bragg grating goes through the optical fiber metal protective sleeve. The vibration sensor provided by the invention is simple in structure and can be serially used in large amount, and the biaxial measurement has good reliability and stability.

Description

technical field [0001] The invention belongs to the technical field of optical fiber grating sensing, and in particular relates to a high-temperature-resistant dual-axis optical fiber grating vibration sensor. Background technique [0002] Optical fiber vibration sensing technology is a kind of when the optical fiber sensor is affected by external interference, some characteristics of the transmitted light in the optical fiber will change. Through special sensing equipment, the signal is collected and analyzed to detect the change in the characteristics of the light, thereby detecting The vibration of the object. With the continuous development of sensing technology, people's technical requirements for sensors are also increasing. It is rare to find a vibration sensor that satisfies the conditions of high sensitivity, low cost, simple preparation process, and good stability at the same time. In the sensing and detection process, sensitivity and stability are the main techn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 魏鹏赵一鸣刘清波
Owner 山东双测安全信息技术产业研究院有限公司
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