A modem and fiber optic laser hydrophone

A technology of modulation and demodulation and acousto-optic modulator, which is applied in the direction of instruments, measuring devices, using wave/particle radiation, etc., and can solve the problems affecting the application of fiber laser hydrophones, the difficulty of obtaining the output dynamic range, and the demodulation scheme. Sub-harmonic and other problems, to overcome the low stability of PZT modulation frequency, increase the modulation frequency, and simplify the mathematical form

Active Publication Date: 2021-03-26
BEIJING INST OF AEROSPACE CONTROL DEVICES
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Problems solved by technology

[0004] However, due to the characteristics of PZT itself, the modulation frequency ω 0 Low, according to the principle of PGC demodulation, the output dynamic range of the demodulated signal is related to the modulation frequency ω 0 It is directly related to the size of the hydrophone. When the sensitivity of the hydrophone is high, it is difficult to obtain a large output dynamic range by using the current PZT modulation method. When the signal is large, it is easy to cause saturation, which affects the application of the fiber laser hydrophone. ,at the same time figure 1 The demodulation scheme shown will generate a large second harmonic, which is not conducive to subsequent signal processing

Method used

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  • A modem and fiber optic laser hydrophone
  • A modem and fiber optic laser hydrophone
  • A modem and fiber optic laser hydrophone

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specific Embodiment

[0052] Such as figure 2 As shown, the present embodiment provides a fiber laser hydrophone, including a pump light source 1, a 980nm / 1550nm wavelength division multiplexer 2, a fiber laser hydrophone probe, an optical isolator 7 and a modulation and demodulation device; 980nm The pump light output by the pump light source 1 enters the fiber laser hydrophone probe through the 980nm / 1550nm wavelength division multiplexer 2, and the fiber optic hydrophone probe returns the 1550nm wavelength laser through the 980nm / 1550nm wavelength division under the action of the pump light. The multiplexer 2 passes through the optical isolator 7, and then splits the light into two paths through the coupler 6. One path of light passes through the first AOM5 and the fiber ring 4, and then returns to the coupler 6 according to the original optical path through the first Faraday rotating mirror 3, and the other One path of light passes through the second AOM22 and returns to the coupler 6 through ...

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Abstract

The invention relates to a modem and a fiber laser hydrophone, and belongs to the technical field of optical fiber sensing. A modem device comprises a modulating system and a demodulating system, themodulating system comprises a coupler 6, a first acoustic optical modulator 5, a fiber optic ring 4, a first Faraday rotating mirror 3, a second acoustic optical modulator 22, a second Faraday rotation mirror 23 and a photodetector 8. The modem avoids the saturation phenomenon of the fiber laser hydrophone when receiving large energy underwater acoustic signals and improves the application range of the hydrophone, the mathematical form of interference signals generated by the modulation is concise, and subsequent water acoustic signal processing is facilitated.

Description

technical field [0001] The invention relates to a modem and an optical fiber laser hydrophone, belonging to the technical field of optical fiber sensing. Background technique [0002] As a new type of hydrophone, the fiber laser hydrophone has received extensive attention in the field of hydrophones due to its advantages such as thin diameter, high sensitivity, and anti-electromagnetic interference. The fiber laser hydrophone uses the active grating as the sensitive unit. When the sound wave acts on the hydrophone, the reflection wavelength of the active grating moves proportional to the sound pressure. As long as the change of the wavelength is detected, the external sound can be reflected. Therefore, the wavelength demodulation technology directly affects the detection quality and accuracy of underwater acoustic signals. [0003] At present, the most commonly used wavelength detection method for fiber laser hydrophones is interferometry, which uses an unbalanced fiber int...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 李振郑百超张海岩王学锋赵晨赵俊鹏
Owner BEIJING INST OF AEROSPACE CONTROL DEVICES
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