A High Stability Interferometric Optical Fiber Hydrophone Signal Demodulation Method
A technology for optical fiber hydrophones and interference signals, which is applied in the direction of instruments, measuring devices, and using wave/particle radiation, etc., can solve the problem of array gain level decline, affecting the consistency of multi-channel optical fiber hydrophone element amplitudes, and affecting array application performance issues
Active Publication Date: 2021-02-26
NAT UNIV OF DEFENSE TECH
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Problems solved by technology
For example, in the application of vector optical fiber hydrophone, the estimation of the target azimuth can be realized by comparing the signal amplitude of the orthogonal hydrophone channel, and the instability of the demodulated signal will directly lead to the estimation error of the target azimuth; In the application of the earphone array, the signal instability will affect the amplitude consistency between the multi-channel fiber optic hydrophone elements, which will directly lead to the decrease of the array gain level and seriously affect the performance of the array application.
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[0043] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0044] see figure 1 , figure 1 It is a flow chart of a signal demodulation method for a high-stability interferometric fiber optic hydrophone provided in the first embodiment.
[0045] The interference type optical fiber hydrophone signal demodulation method provided by the invention comprises the following steps:
[0046] Step S100: The laser applies sinusoidal frequency modulation, and the laser inputs the output light wave into the unbalanced interference type fiber optic hydrophone, the fiber optic hydrophone applies a large-amplitude test sound signal, and the fiber optic hydrophone inputs the output test interference signal into the signal demodulation system , and obtain the estimated value of the demodulation system parameters after tes...
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The present invention disclosed a method of interfering -type optical fiber water hearing device signal, including the following steps: Step S100: Laser applies sinusoidal frequency modulation, laser inputs the output of the output of the non -balanced interference optical fiber water hearing, and the fiber water hearing device is applied toSignificantly testing the sound signal. The optical fiber water hearing device will output the test interference signal input signal demodulation system, and test the interference signal processing to obtain the demodulation system parameter estimation value; step S200: put the fiber water hearing device in the measurement environment measurement measurement measurement measurement measurement measurementA vocalist signal, the actual interference signal input signal demodulation system output by the optical fiber water hearing device, after the actual interference signal is processed and the demodulation system parameter estimates is corrected, the sound measurement signal is obtained.A high -stable signal detection of interference optical fiber water hearing device is implemented.
Description
technical field [0001] The invention relates to the technical field of signal demodulation of an optical fiber hydrophone, in particular to a signal demodulation method of a high-stability interference type optical fiber hydrophone. Background technique [0002] Optical fiber hydrophone is a new type of underwater acoustic sensor, which has the characteristics of high sensitivity, smart structure, and easy reuse to form a large-scale array. It has important applications in underwater target detection, seismic wave detection and other fields. Among various types of fiber optic hydrophones, the interferometric fiber optic sensor is based on the fiber optic interferometer structure. Through high-sensitivity coherent detection technology, the measured signal is loaded in the output signal of the sensor in the form of phase, which has high sensitivity and low noise. Many excellent characteristics. However, due to the random phase fading phenomenon of the interferometric fiber op...
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IPC IPC(8): G01H9/00
Inventor 姚琼王付印夏利锋曹春燕侯庆凯梁迅陈虎熊水东罗洪
Owner NAT UNIV OF DEFENSE TECH