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General calibration system and method of phase shift sensitivity based on optical phase demodulator

A technology of calibration system and demodulation system, which is applied in the field of underwater acoustic sensor parameter measurement, can solve problems such as poor calibration accuracy, and achieve the effects of simple operation, wide calibration frequency band, and low measurement uncertainty

Active Publication Date: 2011-05-25
THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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Problems solved by technology

The Bessel function ratio method uses the Bessel function ratio to obtain the optical phase shift of the phase interference fiber optic hydrophone, thereby obtaining the phase shift sensitivity of the fiber optic hydrophone. The calibration accuracy is poor when the signal-to-noise ratio is not high

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  • General calibration system and method of phase shift sensitivity based on optical phase demodulator

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Embodiment Construction

[0016] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0017] The invention relates to a general calibration system for phase shift sensitivity of an optical phase demodulator. The calibration system can accurately calibrate the phase shift sensitivity of a phase interference optical fiber hydrophone. The system is used for phase shift sensitivity calibration of phase interference fiber optic hydrophone. The calibration system consists of four subsystems: control and management system, underwater acoustic signal transmitting system, optical phase demodulation system and electrical signal receiving system. The optical phase demodulation subsystem in the present invention uses the OPD4000 demodulator for optical signal processing, and the internal signal processing principle process of OPD4000 is as follows figure 1 As shown, it is possible to demodulate the phase of the interference light in real time and use the ...

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Abstract

The invention relates to a general calibration system and method of phase shift sensitivity based on an optical phase demodulator. The calibration system is established based on an OPD4000 optical phase demodulator for the calibration of phase shift sensitivity of an interference type optical fiber hydrophone. The calibration system is consisted of four sub-systems, namely a control and management system, an underwater sound signal emitting system, an optical phase demodulating system and an electrical signal receiving system. The optical phase demodulating sub-system is formed based on the principle of outer modulation demodulating technology of phase generation carrier, and can demodulate the interference optical phase in real time and output the result using a simulation signal. The system has the following beneficial effects that the frequency response for phase shift sensitivity of phase interference type optical fiber hydrophone is acquired accurately in real time, and the output in two data forms of simulation and digit is provided. The system is suitable for the calibration of phase shift sensitivity of phase interference type optical fiber hydrophone of each type with different arm length differences, and has the characteristics of wide calibration frequency band, wide dynamic range, low measurement uncertainty and the like, and is simple in operation.

Description

technical field [0001] The invention belongs to the field of underwater acoustic sensor parameter measurement, and mainly relates to a general calibration system and method for phase shift sensitivity based on an optical phase demodulator. Background technique [0002] Due to the unique advantages of fiber optic sensors, it is widely used in the field of national defense, mainly for navigation and security defense. Among them, the fiber optic sensors used in the field of underwater acoustics are mainly fiber optic hydrophones and their arrays. Fiber optic hydrophone is a new type of acoustic sensor. Compared with traditional piezoelectric hydrophone, fiber optic hydrophone has high detection sensitivity, wide response frequency range, resistance to harsh environments, light structure, anti-electromagnetic interference and easy large-scale production. Array and other characteristics are an important development direction of modern sonar. Therefore, after Bucaro et al. of th...

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Application Information

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IPC IPC(8): G01H9/00
Inventor 陈毅张军费腾罗马奇徐平王世全
Owner THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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