Interference type optical fiber vector hydrophone with reference interferometer

A technology of vector hydrophones and interferometers, applied in instruments, measuring devices, and measuring ultrasonic/sonic/infrasonic waves, etc., can solve the problem of low frequency drift and low correlation, and achieve the effect of eliminating phase noise

Pending Publication Date: 2020-08-25
CHINA ELECTRONICS TECH GRP NO 7 RES INST
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Problems solved by technology

[0021] In order to solve the problem that the low-frequency drift correlation caused by the external environment is low when the reference interferometer is independent of the optical fiber vector hydrophone, the present invention provides an interferometric opti

Method used

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  • Interference type optical fiber vector hydrophone with reference interferometer
  • Interference type optical fiber vector hydrophone with reference interferometer
  • Interference type optical fiber vector hydrophone with reference interferometer

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Embodiment 1

[0046] Such as Figure 5 Shown, a kind of interferometric optical fiber vector hydrophone with reference interferometer, comprises rigid spherical mass block 1, the elastic tube 2 that quantity is 6, the optical fiber interferometer that quantity is 4, shell;

[0047] There are six elastic tube mounting grooves 4 in the X, Y, and Z three-axis directions that are orthogonal to each other on the mass block 1, and two symmetrical reference interferometer mounting grooves 5 are arranged in the Z-axis direction;

[0048] The six elastic cylinders 2 are sequentially installed in the elastic cylinder installation groove 4 on the mass block 1 to form six axes of X+, X-, Y+, Y-, Z+, and Z-;

[0049] The end of the elastic cylinder 2 is provided with a gland 3, so that the corresponding elastic cylinder 2 is fixed between the gland 3 and the mass block 1;

[0050] Such as figure 1 As shown, the optical fiber interferometer includes input and output pigtails, optical fiber couplers, op...

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Abstract

The invention discloses an interference type optical fiber vector hydrophone with a reference interferometer. The interference type optical fiber vector hydrophone comprises a mass block, an elastic cylinder, an optical fiber interferometer and a shell used for placing the mass block, the elastic cylinder and the optical fiber interferometer. According to the invention, the reference interferometer and the sensing interferometer are packaged in the shell of the same hydrophone. When the hydrophone is influenced by temperature and other external environments, the hydrophone can be heated; low-frequency random drifts generated by phase signals of the reference interferometer and the sensing interferometer are highly similar. In practical application, the phase noise of the reference interferometer and the phase noise of the sensing interferometer caused by the laser are highly related, so that the phase noise of the signals of the sensing interferometer can be eliminated by performing signal processing on the signals of the reference interferometer and the sensing interferometer.

Description

technical field [0001] The invention relates to the technical field of underwater acoustic detection applications, and more specifically, relates to an interferometric optical fiber vector hydrophone with a reference interferometer. Background technique [0002] The optical fiber vector hydrophone is an underwater acoustic sensor based on optical fiber and optoelectronic technology. It uses the intensity, polarization state, phase and other parameters of the light wave in the light wave to obtain the frequency, intensity and other information of the sound wave. It has high sensitivity and response. It has the characteristics of wide frequency band, anti-electromagnetic interference, resistance to harsh environments, and smart structure. It is used in underwater acoustic warning sonar, towed line array sonar, broadside conformal array sonar, underwater mine acoustic fuze, torpedo detection sonar, multi-base sonar, navigation and positioning of underwater submersibles, distrib...

Claims

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Application Information

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IPC IPC(8): G01H9/00
CPCG01H9/004G01H9/006
Inventor 易朗宇腾潢龙徐红霞沈燕青高发仁陈含芳杨廷新
Owner CHINA ELECTRONICS TECH GRP NO 7 RES INST
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