Device and method for simultaneously improving demodulation speed and measuring range of fiber bragg grating
A technology of fiber grating demodulation and speed, which is applied in the direction of measuring devices, using optical devices, and using optical devices to transmit sensing components, etc., can solve the problems of increasing the cost of range and speed frequency-sweeping lasers, and achieve wavelength repeatability and repeatability. Improvement of precision and improvement of cost control
Active Publication Date: 2022-04-29
武汉奇测科技有限公司
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[0005] Aiming at the defect that the optical fiber demodulation is contradictory between the range and the speed in the prior art and the technical problem that the cost of the frequency-swept laser with a large scanning range will increase significantly, the present invention provides a fiber grating demodulation speed and range simultaneously improved Device and method
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[0031] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further elaborated below in conjunction with specific embodiments and accompanying drawings, but the following embodiments are only preferred embodiments of the present invention, not all . Based on the examples in the implementation manners, other examples obtained by those skilled in the art without making creative efforts all belong to the protection scope of the present invention.
[0032] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.
[0033] refer to figure 1 In this embodiment, the device for simultaneously improving the demodulation speed and range of the fiber grating includes a frequency-sweeping laser 1, a fiber isolator 2, a fiber coupler 3, a fiber circulator 4, FBG5, a photodetector 6, and an HCN gas absorption cavity 7 , a wave...
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The invention discloses a device and a method for simultaneously improving the demodulation speed and the measuring range of a fiber bragg grating. The device comprises a sweep frequency laser, an optical fiber coupler, an optical fiber circulator, an FBG, a photoelectric detector, an HCN gas absorption cavity, a wavelength synchronous triggering unit, a data acquisition card and a computer. According to the device provided by the invention, high-speed and wide-range demodulation of the FBG can be realized in an extremely short frequency sweeping range of the frequency sweeping laser. According to the method provided by the invention, the limitation of the drifting of the traditional FBG demodulation reflection peak is broken through, and the traditional FBG demodulation effect can be achieved only through a certain section of reflection spectrum of the FBG. The invention further provides a wavelength synchronous triggering unit, the FBG spectrum after wavelength calibration can be acquired by using a data acquisition card, and the wavelength repeatability of FBG demodulation is ensured. According to the invention, three key parameters in FBG demodulation, namely demodulation speed, measurement range and repetition precision, are improved, meanwhile, the cost control is also obviously improved, and the method is suitable for the field of temperature, high-speed strain and impact collision measurement.
Description
technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a device and method for simultaneously improving the demodulation speed and range of an optical fiber grating. Background technique [0002] FBG (Fiber Bragg Grating, Fiber Bragg Grating) demodulation based on tunable laser light source in fiber Bragg grating sensing demodulation technology is developing rapidly due to its unique technical advantages. The principle of FBG demodulation based on tunable laser light source is that the frequency-sweeping laser can scan the reflection spectrum peak of FBG. When the external temperature or strain acts on the FBG, the reflection spectrum will drift. It is only necessary to find out the drift of the peak value. The temperature or strain of the measured object can be obtained. [0003] The demodulation speed of this type of FBG fiber Bragg grating demodulation technology mainly depends on the scanning repetition frequency o...
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IPC IPC(8): G01K11/3206G01B11/16G01D5/26
CPCG01K11/3206G01B11/165G01D5/268
Inventor 刘凤云
Owner 武汉奇测科技有限公司