Optical fiber raster vibration sensor of tunable matching filtering demodulation

A vibration sensor, filtering and demodulation technology, applied in vibration testing, instruments, using wave/particle radiation, etc., can solve the problems of narrow sensor frequency response bandwidth, small sensor signal-to-noise ratio, poor measurement accuracy, etc., to improve the response sensitivity. , the effect of improved sensitivity and precision, simple structure

Active Publication Date: 2006-03-29
WUHAN WUTOS
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Problems solved by technology

This kind of sensor has a narrow frequency response bandwidth and can only achieve vibration measurement of a specific resonant frequency
At the same time, this sensor structure only uses a fiber grating, which uses the principle of microbending loss instead of the wavelength demodulation principle of fiber grating. This sensor has a small signal-to-noise ratio, poor measurement accuracy, and low sensitivity.

Method used

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  • Optical fiber raster vibration sensor of tunable matching filtering demodulation
  • Optical fiber raster vibration sensor of tunable matching filtering demodulation

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Embodiment Construction

[0021] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0022] The structural diagram of the fiber grating vibration sensor with tunable matched filter demodulation of the present invention is as follows figure 1 As shown, it includes a demodulation grating 1, a sensing grating 2, an auxiliary beam 3, a main beam 4, a cylinder 5, a damping fluid 6, a mass 7, a sealing cover 8, an adjustment frame 9, a screw 10, and a nut 11. The connection method of the present invention is as follows: the demodulation grating 1 and the sensing grating 2 are connected in series, and the demodulation optical fiber 1 and the sensing optical fiber 2 are respectively rigidly pasted on the auxiliary beam 3 and the main beam 4, and the auxiliary beam 3 and the main beam One end of the beam 4 is fixed on the sealing cover 8, the plane directions of the two beams are perpendicular to each other, the auxiliary beam 3 and th...

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Abstract

The invented optical-fibre grating vibration sensor is characterized by that it utilizes a demodutation grating and a sensing grating and makes them be series-connected together, and respectively makes them be stuck on a main beam and an auxiliary beam, two beams are made of identical material and have identical heat expansion coefficient, so that their central wavelengths can be synchronously shifted with temperature, therefore they have automatic temperature compensation function so as to implement matching filter demodutation. Said invention utilizes the detection of light intensity change of sensing grating reflecting light to monitor the parameters of vibration frequency and vibration amplitude of monitored body, finally utilizes computer or single-chip computer to make analysis and processing of body vibration frequency spectrum.

Description

technical field [0001] The invention relates to a fiber grating vibration sensor capable of tunable matching filter demodulation, which is mainly used for measuring the vibration frequency and amplitude of an object and belongs to the field of optoelectronic testing. technical background [0002] Vibration sensors have important applications in many fields, for example, real-time monitoring of large electromechanical equipment, bridge structures, etc. The vibration sensor can judge the working state of the object by monitoring the vibration state of the object, and troubleshoot in time to avoid major accidents. [0003] Traditional electrical vibration sensors output weak electrical signals, which cannot be transmitted over long distances. Moreover, such sensors have poor reliability in outdoor harsh environments and are not suitable for use in long-term remote safety monitoring systems such as bridges. In addition, electrical sensors are susceptible to electromagnetic inte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M7/02G01H9/00
Inventor 姜德生张东生高翩罗裴
Owner WUHAN WUTOS
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