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Large dynamic range heterodyne interferometry type fiber optic hydrophone system

A fiber optic hydrophone and large dynamic range technology, applied in the field of sensors, can solve problems such as inability to locate and hydrophone clipping, and achieve the effects of increasing the upper limit of dynamic range, reducing phase noise, and improving signal-to-noise ratio

Active Publication Date: 2018-06-29
BEIJING INST OF AEROSPACE CONTROL DEVICES
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Problems solved by technology

[0003] When the air target falls into the sea and the water impact energy is relatively large, general hydrophones are prone to clipping, resulting in the inability to locate

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  • Large dynamic range heterodyne interferometry type fiber optic hydrophone system
  • Large dynamic range heterodyne interferometry type fiber optic hydrophone system
  • Large dynamic range heterodyne interferometry type fiber optic hydrophone system

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Embodiment Construction

[0044] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0045] figure 1 It is the optical path structure diagram of the present invention, and the heterodyne interferometric fiber optic hydrophone system with large dynamic range includes: a narrow linewidth laser 1, an isolator 2, a first coupler 3, a first acousto-optic modulator 4, a second acoustic Optical modulator 5, first fiber delay loop 6, acousto-optic modulator drive 7, second coupler 8, first circulator 9, second circulator 10, first photodetector 11, second photodetector 12. Reference probe 13, sensing probe 14 and signal demodulation module 15;

[0046]The continuous light output by the narrow-linewidth laser 1 passes through the isolator 2 and then passes through the first coupler 3 to be divided into two beams of light, and ...

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Abstract

The invention relates to a large dynamic range heterodyne interferometry type fiber optic hydrophone system which comprises a narrow linewidth laser, a first coupling, a first acoustic optical modulator, a second acoustic optical modulator, a first optical fiber delay ring, an acoustic optical modulator driver, a second coupling, a first circulator, a second circulator, a first photoelectric detector, a second photoelectric detector, a reference probe, a sensing probe and a signal demodulating module, wherein an optic signal output by the narrow linewidth laser is converted into two pieces ofpulse light with different frequencies through the first and second acoustic optical modulators, the pulse light intervenes through the probe of the fiber optic hydrophone to beat frequency to obtaina heterodyne signal of a certain frequency, and the system expands the dynamic range of the heterodyne interferometry type fiber optic hydrophone by improving the frequency of the heterodyne signal ofbeat frequency, so that the demand on measurement of large-range signals is met.

Description

technical field [0001] The invention belongs to the field of sensors and relates to a heterodyne interference optical fiber hydrophone system with a large dynamic range. Background technique [0002] At present, the measurement methods for air targets falling into the sea mainly include water column radar, aerial survey, aeroacoustic measurement, underwater acoustic measurement, etc. Compared with other measurement methods, the underwater acoustic measurement method has strong environmental adaptability, and can (heavy fog, heavy precipitation, etc.), severe sea conditions and various sea areas to perform measurement tasks. Aiming at the measurement requirements of aerial targets falling into the sea, the sonar buoy hydroacoustic measurement scheme based on the optical fiber hydrophone system is adopted. Within the scope of the target area at sea, with the target position as the center of the circle, multiple sensors are evenly placed on a circle with a specified radius. Se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 郑百超张海岩郝良彬李振
Owner BEIJING INST OF AEROSPACE CONTROL DEVICES
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