Temperature and stress measuring device based on orthogonal dual-polarization fiber laser
A technology of fiber laser and fiber laser, which is applied to measuring devices, thermometers with physical/chemical changes, thermometers, etc., can solve the problems of reducing demodulation accuracy, increasing cost and complexity, and achieving mature, simple and stable manufacturing processes Good, high-sensitivity effect
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[0012] The present invention will be further described below in conjunction with the accompanying drawings.
[0013] The invention includes three parts: an optical fiber sensing unit, a signal processing unit and a signal demodulation unit. The optical fiber sensing unit is a single longitudinal mode dual polarization DBR fiber laser sensor; the signal processing unit includes a 980nm laser, a 980 / 1550 nm wavelength division multiplexer, an optical isolator, a polarization controller, a narrow linewidth laser, and 3dB A coupler, a polarizer and a photoelectric converter; the signal demodulation unit is a spectrum analyzer. The sensing unit is a DBR (Distributed Bragg Reflection) fiber laser, which is composed of a pair of FBG gratings and a resonant cavity. See figure 1 . Since the pair of FBG sub-gratings have the same temperature sensitivity and different stress sensitivity, the two groups of gratings have the same temperature sensitivity under the action of external tempe...
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