Fiber type vibration sensing and measuring system

A vibration sensing and measurement system technology, applied in measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the problems of inability to measure strain, poor stability, and low sensitivity, and achieve high sensitivity, stable performance, and testing effect accurate effect

Active Publication Date: 2017-06-20
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

The disadvantages of the existing measuring devices are low sensitivity, high cost, poor stability and inability to measure the strain caused by the bending moment

Method used

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  • Fiber type vibration sensing and measuring system
  • Fiber type vibration sensing and measuring system
  • Fiber type vibration sensing and measuring system

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Embodiment Construction

[0029] The technical solutions in the embodiments of the present invention will be described clearly and in detail below with reference to the drawings in the embodiments of the present invention. The described embodiments are only some of the embodiments of the invention.

[0030] The technical scheme that the present invention solves the above-mentioned technical problem is,

[0031] Such as figure 1Shown is the working principle of the fiber optic vibration sensor measurement system of the present invention. The pulse light source signal generates a certain optical signal, which is transmitted along the direction of the transmission fiber. The signal light is transmitted from the fiber end to the interface end, and the interface end transmits the optical signal to the fiber segment respectively, which is connected to the power supply end through the fiber segment; the optical fiber segment The signal will be transmitted to the variable optical attenuator, and the optical ...

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Abstract

The invention relates to a fiber type vibration sensing and measuring system, especially to a notch type fiber vibration sensing system based on a cantilever structure. The system mainly comprises a support structure, an elastic cantilever beam, a test mass block, a fixed fiber beam, a connecting fiber, a notch type grating, a variable optical attenuator, a balancing photo detector, an electronic spectrum analyzer and a polarization controller. The test mass block is applied to the tail end of the cantilever beam, and can detect the vibration amplitude and acceleration signals. A test module is driven in an optical driving manner, an acceleration generates relative displacement change of the cantilever beam, and the relative displacement change is converted to change of optical signals. According to the intention, the optical signal change is detected and converted to the acceleration and vibration amplitude of a measuring carrier, the structure is simple, the technical cost is low, and the system is not limited by a vibration direction of an object, and has practical application values.

Description

technical field [0001] The invention relates to the field of optical fiber type vibration sensor measurement, in particular to an optical fiber type vibration sensor measurement system. Background technique [0002] As a wavelength-modulated photonic device, fiber-optic sensors not only have the advantages of light weight, small size, high precision, reusability, corrosion resistance, and immunity to electromagnetic interference, but also have commercial applications. Vibration is a common phenomenon, and a reasonable solution to vibration problems in engineering practice has important engineering application value. In structural strain monitoring or sensor design, it is usually necessary to paste the fiber grating on the surface of the measured object or elastic body or embed it in it, so as to sense the corresponding vibration strain value of the measured object in real time. Therefore, the effect of the adhesive layer directly determines the accuracy of the strain measur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 刘宇李云梅周帆路永乐郭俊启邸克钟懿向磊
Owner CHONGQING UNIV OF POSTS & TELECOMM
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