Fiber-optic hydrophone system based on distributed optical fiber sound sensing technology
An optical fiber hydrophone and sensing technology technology, which is applied to vibration measurement in instruments and fluids, and measurement of ultrasonic/sonic/infrasonic waves, etc. The effect of strong network capability, simple structure and low cost
Inactive Publication Date: 2016-06-01
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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The distributed optical fiber acoustic sensing system based on phase generation carrier technology (application number CN201410032610) can detect vibration or acoustic signals at any position of the transmission fiber, but it is difficult to detect weak underwater acoustic signals due to the poor sensitivity of the transmission fiber
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[0022] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.
[0023] Please refer to figure 1 , the present invention provides a fiber optic hydrophone system based on distributed fiber optic acoustic sensing technology, including:
[0024] A distributed optical fiber acoustic sensor demodulator 1, the distributed optical fiber acoustic sensor demodulator is used to emit light pulses and perform phase demodulation on reflected Rayleigh scattered light.
[0025] A transmission optical cable 2, used to transmit light pulses and generate Rayleigh scattered light.
[0026] A fiber optic hydrophone array 3, the fiber optic hydrophone array is composed of several fiber optic hydrophone units (30), and each fiber optic hydrophone unit 30 is fixed on the transmission cable 2 according to a...
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The invention discloses a fiber-optic hydrophone system based on a distributed optical fiber sound sensing technology. The fiber-optic hydrophone system includes a distributed optical fiber sound sensing demodulation instrument (1) which is used for emitting optical pulses and performing phase demodulation on reflected rayleigh scattering light; a transmission optical cable (2) which is used for transmitting the optical pulses and generating the rayleigh scattering light; and an optical fiber geophone array (3) which includes a plurality of fiber-optic hydrophone units (30), each fiber-optic hydrophone unit being fixed on the transmission optical cable (2) according to a certain interval and used for detecting weak underwater acoustic signals. According to the invention, large-scale sensing unit networking is realized through the distributed optical fiber sound sensing technology, and the detection of the weak underwater acoustic signals is realized through sound pressure sensitization. The fiber-optic hydrophone system has simple structure, strong networking capacity, and low cost.
Description
technical field [0001] The invention relates to the field of underwater acoustic sensing, in particular to the application of passive optical fiber hydrophones for measuring underwater acoustic signals. Background technique [0002] The fiber optic hydrophone is a passive passive acoustic detection device that can measure underwater acoustic signals for underwater target detection. Compared with traditional electrical sensors, optical fiber hydrophones have the characteristics of simple structure, small size, light weight, corrosion resistance, anti-electromagnetic interference, and long sensing distance through all-optical transmission, and are suitable for working in underwater environments for a long time. Optical fiber hydrophones have great application value in marine resource exploration, underwater intrusion monitoring and other fields. [0003] There are many ways to realize the fiber optic hydrophone system: one is the fiber optic hydrophone system based on the fib...
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IPC IPC(8): G01H3/00G01H9/00
CPCG01H3/00G01H9/004
Inventor 徐团伟方高升蒋越李芳
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI