Heterodyne-interference-type optical fiber hydrophone time division multiplexing array and demodulation method

A technology of heterodyne interference and fiber-optic delay, which is applied in the direction of instruments, wave/particle radiation, and measuring devices, and can solve fiber-optic hydrophone fiber-optic hydrophone probe consistency fiber-optic hydrophone time-division multiplexing array crosstalk, etc. problem, to achieve the effect of reducing phase noise

Active Publication Date: 2016-10-26
BEIJING INST OF AEROSPACE CONTROL DEVICES
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Problems solved by technology

[0006] In order to solve the problems of high-frequency detection of optical fiber hydrophones, "wet end" all-opticalization, consistency of optical fiber hydrophone probes, and time-division mu

Method used

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  • Heterodyne-interference-type optical fiber hydrophone time division multiplexing array and demodulation method
  • Heterodyne-interference-type optical fiber hydrophone time division multiplexing array and demodulation method
  • Heterodyne-interference-type optical fiber hydrophone time division multiplexing array and demodulation method

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[0092] The sensing optical signal and reference optical signal enter the digital demodulation module after passing through the first photodetector and the second photodetector. The digital demodulation module is composed of a high-speed digital processor. Taking FPGA and DSP as an example, the FPGA performs sensing signal and The preprocessing of the reference signal includes signal selection, band-pass filtering, multiplication and low-pass filtering; the signal selection is triggered by a 60kHz pulse signal. Obtain a reference signal y with a frequency of 60kHz through a band-pass filter r And the sensing signal y of each channel sn , using a 500-order FIR filter with a passband of 50kHz to 70kHz; the quadrature reference signal y sr It is obtained by performing Hilbert transform on the reference signal; the sensing signal is multiplied by the reference signal and the quadrature reference signal respectively, and the low-pass filter is used to remove the high-frequency amou...

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Abstract

A heterodyne-interference-type optical fiber hydrophone time division multiplexing array and a demodulation method are disclosed. The optical fiber hydrophone time division multiplexing array comprises a narrow linewidth laser, a first coupler, a first acoustic-optical modulator, a second acoustic-optical modulator, a first optical fiber delay ring, a second coupler, a first circulator, a second circulator, a first photoelectric detector, a second photoelectric detector, a reference probe and a hydrophone sensing array. The sensing array adopts a parallel structure. Pulse light enters into each probe of the array through the delay ring in a time sharing mode so as to generate a sensing light signal. The reference probe is used for generating a reference light signal. The sensing light signal and the reference light signal are collected by the photoelectric detectors and then are converted into analog electronic signals. A signal demodulation module is used to carry out analog-to-digital conversion on the signals respectively. An arc tangent algorithm is used to resolve a submarine sound signal perceived by the sensing array.

Description

technical field [0001] The invention relates to the field of optical fiber hydrophones, in particular to a time-division multiplexing array and a demodulation method for a heterodyne interference optical fiber hydrophone. 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. According to the demodulation scheme, it is divided into active homodyne method, 3×3 coupler method, PGC method and heterodyne method. The selection and implementation method of the signal demodulation scheme is not only related to the detection sensitivity, dynamic range and other important index factors for fiber optic hydrophones, but also determines the optical path structure adopted by the array. [00...

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Application Information

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IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 张磊郝良彬张海岩李振郑百超王海亮侯振兴于文鹏
Owner BEIJING INST OF AEROSPACE CONTROL DEVICES
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