Interference-type optical fiber hydrophone optical path system and acoustic signal detection method thereof

Abstract

The invention discloses an interference-type optical fiber hydrophone optical path system and an acoustic signal detection method thereof. The interference-type optical fiber hydrophone optical path system comprises a light source modulation system, a circulator, an optical fiber hydrophone probe, a photoelectric detector, an analog-to-digital converter and a signal demodulation processor. A pulselight sequence output by the light source modulation system enters the optical fiber hydrophone probe through the circulator and divided into two ways in the optical fiber hydrophone probe, one way is used for sensing an external acoustic signal and is delayed, and the delayed light sequence interferes with the other way of light sequence to form a beat frequency optical signal; the photoelectricdetector converts the beat frequency optical signal into an analog beat frequency electrical signal, and the analog beat frequency electrical signal is converted into a digital beat frequency electrical signal through the analog-to-digital converter; and the signal demodulation processor stores the digital beat frequency electrical signal when the external acoustic signal does not exist, according to the stored digital beat frequency electrical signal when the external acoustic signal does not exist, a received digital beat frequency electrical signal when the external acoustic signal existsis subjected to signal demodulation processing, and the external acoustic signal is obtained.

Description

technical field [0001] The invention relates to a novel interference optical fiber hydrophone optical path system, which belongs to the field of optical fiber hydrophones. Background technique [0002] Optical fiber hydrophone is a new type of sensor based on optical fiber and optoelectronic technology. Its principle is to use sound waves to modulate the intensity, polarization, phase and other parameters of light waves to obtain information such as frequency and intensity of sound waves. Optical fiber hydrophones have high sensitivity, wide bandwidth, good frequency response characteristics, hydrostatic pressure resistance, "wet end" full light, high stability, lighter and smaller optical cables, high temperature resistance, corrosion resistance, long transmission distance, With the advantages of being reusable on a large scale, it has gradually replaced traditional piezoelectric hydrophones and has been applied in military, commercial, scientific research and other fields....

AI Technical Summary

Problems solved by technology

The above-mentioned optical path system including the reference end of the fiber optic hydrophone has certain limitations: it is difficult to realize the sound insulation, vibration isolation and heat insulation of the reference end of the fiber optic hydrophone; the reference end of the fiber optic hydrophone increases the complexity of the optical path system, and it is easy to introduce redundant noise ; The reference terminal of the optical fiber hydrophone increases the power consumption of the matched signal demodulation system and complicates the structure

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