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Optical fibre grating accelerometer based on cantilever beam deflection

A cantilever beam deflection, fiber grating technology, applied in the direction of velocity/acceleration/shock measurement, measurement acceleration, optics, etc., can solve the problem of limiting the sensitivity of the sensor, and achieve easy adjustment of sensitivity and natural frequency, simple manufacturing process, high sensitivity Effect

Inactive Publication Date: 2008-10-15
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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Problems solved by technology

In this technical solution, on the one hand, the gate area of ​​the fiber grating is directly encapsulated by glue, which is easy to cause chirp of the fiber grating; Sensitivity

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  • Optical fibre grating accelerometer based on cantilever beam deflection

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Embodiment Construction

[0029] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0030] Such as figure 1 as shown, figure 1 The top view of the structure of the fiber grating accelerometer based on the deflection of the cantilever provided for the present invention. The fiber grating accelerometer includes: a housing 1 as the supporting structure of the fiber grating accelerometer, with a first side wall m, a second side wall n, a third side wall p and a fourth side wall q; an optical fiber for measuring acceleration grating 2, one end of the fiber grating 2 is fixedly connected to the mass block 5, and the other end is parallel to the first side wall m and passes through the hole 6 on the second side wall n of the fiber grating accelerometer and extends to the fiber grating accelerometer the outsid...

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Abstract

The invention relates to the optical fiber sensor technical field, disclosing an optical fiber grating accelerometer based on cantilever beam deflection. The accelerometer comprises an outer casing 1 used as a support structure of the accelerometer, an optical fiber grating 2 used to measure acceleration, a cantilever beam 3 with one end horizontally fixed on the third sidewall p of the accelerometer and a mass block 5 fixed at the other end of the cantilever beam 3, wherein the outer casing 1 has a first sidewall m, a second sidewall n, a third sidewall p and a fourth sidewall q; one end of the optical fiber grating 2 is fixed with the mass block 5, while the other end is parallel to the first sidewall m and passes through the hole 6 on the second sidewall n of the accelerometer to extend outside the accelerometer; the cantilever beam 3 is used to send vibration signal to the optical fiber grating 2; and the mass block 5 is used to adjust the sensitivity and the natural vibration frequency of the accelerometer. The optical fiber grating accelerometer increases sensitivity and improves packaging technology.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensors, in particular to an optical fiber grating accelerometer based on the deflection of a cantilever beam. Background technique [0002] Compared with the corresponding conventional sensors, optical fiber sensors also have obvious advantages in terms of sensitivity, dynamic range, and reliability. They are particularly prominent in the fields of national defense and military applications, and are listed as key national defense technologies by many countries. [0003] Optical fiber accelerometer is an instrument that uses the light transmission characteristics of optical fiber and various modulation effects generated by its interaction with the surrounding environment to detect vibrations on the ground, in the air or on the seabed. Compared with the traditional piezoelectric accelerometer, it has the following main advantages: wide frequency range, high sound pressure sensitivity, no elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P15/00B81B7/02
Inventor 张文涛李芳刘育梁
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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