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Polyurethane resin encapsulation-based DBR fiber laser hydrophone

A technology of polyurethane resin and fiber laser, which is applied in the direction of instruments, measuring devices, and measuring ultrasonic/sonic/infrasonic waves, etc., to achieve the effect of convenient reuse and prolonging the service life

Inactive Publication Date: 2015-08-26
TIANJIN UNIV
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

The demodulation of this kind of hydrophone is simple, but it is only suitable for the frequency modulation measurement of MHz ultrasonic high-frequency signals, and it is inherently insensitive to the sound pressure measurement of KHz and below low-frequency signals

Method used

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  • Polyurethane resin encapsulation-based DBR fiber laser hydrophone
  • Polyurethane resin encapsulation-based DBR fiber laser hydrophone
  • Polyurethane resin encapsulation-based DBR fiber laser hydrophone

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with the accompanying drawings.

[0013] Such as figure 1 As shown, the high-sensitivity hydrophone given in the present invention is a single longitudinal mode polarization heterodyne sensor based on DBR fiber laser 1 encapsulated by polyurethane resin 2 . The test device for detecting low-frequency underwater acoustic signals of KHz and below by using the hydrophone as a sensing unit also includes a signal processing unit and a signal demodulation unit.

[0014] Such as figure 2 As shown, the signal processing unit includes a 980nm laser, a 980 / 1550nm wavelength division multiplexer, an optical isolator, a polarization controller, a polarizer, and a photodetector; the signal demodulation unit is a spectrum analyzer.

[0015] The working principle is roughly as follows: the 980nm laser is used as the pump light source, and the 980nm port of the wavelength division multiplexer enters the 980nm / 1550n...

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Abstract

The invention relates to a polyurethane resin encapsulation-based DBR fiber laser hydrophone. The polyurethane resin encapsulation-based DBR fiber laser hydrophone is used for underwater low-frequency signal detection. The hydrophone comprises a DBR fiber laser (1); and the outer surface of the DBR fiber laser (1) is coated with a polyurethane resin layer (2). The hydrophone of the invention has high sensitivity for low-frequency submarine sound signals.

Description

Technical field [0001] The invention relates to an optical fiber laser hydrophone, which is used for detecting low-frequency underwater acoustic signals of KHz and below. Background technique [0002] At present, the most practically used underwater acoustic sensor is the PZT hydrophone, and some of the electronic equipment will be immersed in water. Due to long-term corrosion, the performance of the hydrophone will degrade and cause failure. Compared with PZT hydrophones, optical fiber sensors have the advantages of small size, light weight, high sensitivity, and reusability, especially the anti-electromagnetic interference performance far exceeds that of PZT hydrophones, so they are very suitable for underwater acoustic detection. [0003] Literature "Overview of high performance fiber-optic sensing (Kirkendall, Clay K. (Naval Research Laboratory, Washington, DC 20375, United States); Dandridge, Anthony Source: Journal of Physics D: Applied Physics, v 37, n 18, p R197 -R2...

Claims

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Application Information

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IPC IPC(8): G01H9/00
Inventor 吕辰刚李本萍刘影郭玺任畅
Owner TIANJIN UNIV
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