Heterodyne interference type optical fiber hydrophone synchronous electrical reference system and noise elimination method
A technology of optical fiber hydrophone and heterodyne interference, which is applied in the direction of instruments, measuring ultrasonic/sonic wave/infrasonic wave, measuring vibration, etc., can solve the problems of frequency accuracy of frequency shift noise reference signal of heterodyne interference optical fiber hydrophone, etc. Achieve the effects of improving performance, eliminating frequency shift noise, simplifying optical system and digital demodulation system
Active Publication Date: 2017-01-11
BEIJING INST OF AEROSPACE CONTROL DEVICES
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Problems solved by technology
[0005] The technical problem solved by the present invention is: in order to solve the technical problems of the frequency shift noise of the heterodyne interference fiber optic hydrophone and the frequency accuracy of the reference signal, the present invention provides a synchronous electronic device for the heterodyne interference fiber optic hydrophone. Reference System and Frequency-shifting Noise Elimination Method
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[0084] On the basis of the embodiment, an example is given to illustrate the implementation of the synchronous electrical reference.
[0085] For the heterodyne interferometric optical fiber hydrophone system, the length of the first optical fiber delay loop 5 is 30 meters; the sensing probe 18 adopts a bending-resistant thin-diameter optical fiber to be wound, and in the reference probe 18, the optical signal is transmitted by the third Coupler 12 is 15 meters to the distance of first Faraday rotating mirror 13 and optical signal by the third coupler 13 through the second fiber delay loop 15 to the distance difference of second Faraday rotating mirror 14; The length of the optical path experienced by the pulsed light output by the acousto-optic modulator 3 after being reflected by the first Faraday rotating mirror 13 is the same as that of the pulsed light output by the second acousto-optic modulator 4 after being reflected by the second Faraday rotating mirror 14, two The pu...
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The invention provides a heterodyne interference type optical fiber hydrophone synchronous electrical reference system and a noise elimination method. The synchronous electrical reference system comprises an acousto-optic modulator driver, a frequency mixing circuit, a filter circuit and a phase-shift circuit. During the operation of the synchronous electrical reference system, after the frequency-mixing and filtering process of frequency-shift reference signals driven by two acousto-optic modulators, a synchronous electrical reference signal and a quadrature reference signal thereof are obtained. The frequencies of the above two reference signals are the same with the frequency of the sensing signal of a heterodyne interference type optical fiber hydrophone, so that the frequency-shift noise introduced by the acousto-optic modulators can be eliminated. The performance of the optical fiber hydrophone is improved.
Description
technical field [0001] The invention relates to a synchronous electrical reference system of a heterodyne interference optical fiber hydrophone and a method for eliminating frequency shift noise of an acousto-optic modulator. Background technique [0002] Optical fiber hydrophone is an important direction of modern sonar development. It converts the acoustic signal in water into the phase signal of interference light through the method of phase carrier, and obtains the phase information of light through demodulation algorithm, so as to obtain underwater acoustic information. [0003] The heterodyne interferometric fiber optic hydrophone generates a heterodyne carrier signal through an acousto-optic modulator, modulates the acoustic signal to a high frequency, avoids low-frequency noise interference, and has a large dynamic range. Because the drive of the AOM has a certain frequency-shifting precision, the instability of the frequency-shifting frequency of the AOM will bring ...
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Login to View More IPC IPC(8): G01H9/00G01H3/00
CPCG01H3/00G01H9/004
Inventor 张磊王海亮张海岩王学锋李振郑百超郝良彬侯振兴于文鹏
Owner BEIJING INST OF AEROSPACE CONTROL DEVICES