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Method for realizing multi-channel optical fibre raster sensor high-sensitivity measurement

A high-sensitivity measurement and fiber grating technology, applied in the direction of transmitting sensing components with optical devices, to achieve high Bragg wavelength demodulation sensitivity and good frequency response

Inactive Publication Date: 2005-05-11
TIANJIN UNIV
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Problems solved by technology

For example, in a fiber optic hydrophone array, vibration signals from dozens of sensors need to be detected with extremely high sensitivity and frequency response, and none of the above wavelength demodulation techniques can meet the requirements of this application

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  • Method for realizing multi-channel optical fibre raster sensor high-sensitivity measurement
  • Method for realizing multi-channel optical fibre raster sensor high-sensitivity measurement
  • Method for realizing multi-channel optical fibre raster sensor high-sensitivity measurement

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Embodiment Construction

[0014] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings. as attached figure 1 As shown, the wide-spectrum light emitted by the broadband light source 101 first passes through the circulator 102 and the transmission fiber to multiple FBG sensors 103 , 104 , 105 connected in series. These FBG sensors have different Bragg wavelengths, they feel the vibration when they touch the measured object, and convert the vibration into the change of Bragg wavelength. The FBG sensors 103 , 104 , and 105 reflect the light of the corresponding Bragg wavelength, return it to the circulator 102 along the transmission fiber, and the circulator 102 transmits the reflected light signal to the tunable filter 106 . The output optical signal of the tunable filter 106 is connected to the photodetector 107 , and the output electrical signal is connected to the data acquisition unit 108 . The controller 109 cont...

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Abstract

A high sensitive measuring method of sensing device with multichannel fibre optics grating includes converting displacement, pressure and vibration signal measured by FBG transducer to be Bragg wavelength; carrying out scanning on designed spectrum with tunable filter and recording photoelectric detector output; confirming midpoint of waveform rising or falling edge according to spectrum waveform and using it as working point; carrying out real time measurement by tuning tunable filter center wavelength to working point of each FBG transducer in sequence correspondingly.

Description

technical field [0001] The invention relates to a method for realizing high-sensitivity measurement of a multi-channel optical fiber grating sensing device, which belongs to the optical fiber sensing measurement technology. Background technique [0002] Fiber Bragg grating (FBG for short) is an all-fiber device formed by periodically modulating the refractive index in the core of a single-mode fiber. FBG has been more and more widely used in fields such as optical fiber communication and optical fiber sensing. FBG sensor has significant advantages such as anti-electromagnetic interference, corrosion resistance, long service life, small size, and can realize multi-point distribution measurement by optical wavelength multiplexing, so it plays a huge role in occasions where traditional sensors cannot be used. In recent years, with the continuous development of FBG sensing technology, its application range is also expanding, and it has begun to repla...

Claims

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Application Information

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IPC IPC(8): G01D5/26G01D5/353
Inventor 李恩邦姚建铨郁道银习江涛奇卡罗
Owner TIANJIN UNIV
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