Synchronous multi-channel fiber grating sensing and demodulating system
A fiber grating and sensing solution technology, which is applied in the direction of using optical devices to transmit sensing components, optical waveguide coupling, etc., can solve the problems of unreliable mechanism, high cost, and insufficient speed, and achieve high demodulation accuracy and cost. The effect of low and high speed demodulation
Inactive Publication Date: 2015-07-15
李儒峰
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Currently commonly used demodulation methods include tunable filter method, Mach-Zehnder interferometer method, fiber grating matching method and edge filter method, etc. These methods can only be used for the measurement of static or slowly changing signals, or the cost is relatively high , and are not conducive to the quasi-distributed measurement of multi-point vibration sensing signals
[0003] At present, there are only a few foreign companies with high and low speed FBG (Fiber Bragg Grating, Fiber Bragg Grating) analyzers in the market, but the cost is high, it is not really synchronous, and the price is high, and the speed is not fast enough. There are also a few domestic companies in the market. Research on the FBG demodulator based on MEMS (Micro-Electro-Mechanical Systems, Micro-Electro-Mechanical Systems), but it is not mature, the mechanism is not reliable, and the practical value is low
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[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0021] figure 1 It is a schematic diagram of a synchronous multi-channel fiber grating sensing demodulation system according to an embodiment of the present invention. As shown in the figure, the system includes: a broadband light source (such as ASE or SLED) 101, multiple arrayed waveguide gratings (the channel spacing of which is 50GHz, 100GHz or 200GHz) 104, optical fibers (not shown in the figure), 1*N( N>1) multi-channel optical coupler 102, multiple opt...
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The invention discloses a synchronous multi-channel fiber grating sensing and demodulating system. In the system, an output end of a wideband light source is connected with an input end of a multi-path optical coupler; a first end of each optical circulator is connected with the output end of the multi-path optical coupler; the output end of the multi-path optical coupler corresponds to a channel fiber Bragg grating to be tested; a second end of each optical circulator is connected with the fiber Bragg grating to be tested; a third end of each optical circulator is connected with an input end of an arrayed wave guide grating; the optical fiber is connected between an output end of the arrayed wave guide grating and an input end of a PIN photodiode array; an output end of the PIN photodiode array is connected with a signal processing module; the PIN photodiode array converts a received optical signal into an electric signal and transmits the electric signal to the signal processing module; the signal processing module is connected with a computer; and the signal processing module preprocesses the received electric signal and transmits the fitting result to the computer.
Description
technical field [0001] The invention relates to the fields of petroleum, chemical industry, coal bed gas, weapon system structure analysis, high-speed vibration analysis, etc., and specifically relates to a synchronous multi-channel fiber grating sensing demodulation system. Background technique [0002] Fiber Bragg grating sensing is to measure the change of the measured parameters such as strain, temperature, pressure, ultrasonic wave, acceleration, etc. by detecting the drift of the signal wavelength. It realizes an absolute measurement method. Therefore, how to solve the sensing signal Tuning is the key technology for its practical application. Currently commonly used demodulation methods include tunable filter method, Mach-Zehnder interferometer method, fiber grating matching method and edge filter method, etc. These methods can only be used for the measurement of static or slowly changing signals, or the cost is relatively high , and are not conducive to the quasi-dis...
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IPC IPC(8): G01D5/26G02B6/34G02B6/42
Inventor 李儒峰赵彦华何海
Owner 李儒峰