Phase modulation and demodulation device based on fiber grating hydrophone array

A fiber grating and demodulation device technology, which is applied to measurement devices, instruments, and ultrasonic/acoustic/infrasonic waves, etc., can solve the problems of increasing the complexity of demodulation algorithms, complex structures, and increasing phase noise, and simplifies the complexity of the algorithm. , Simple structure, the effect of reducing phase noise

Active Publication Date: 2018-02-02
ZHEJIANG UNIV
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Problems solved by technology

However, the structure of the patented technical solution is relatively complicated, the reference signal is introduced, and the demodula

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  • Phase modulation and demodulation device based on fiber grating hydrophone array
  • Phase modulation and demodulation device based on fiber grating hydrophone array
  • Phase modulation and demodulation device based on fiber grating hydrophone array

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Embodiment Construction

[0020] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] Such as figure 1 As shown, the phase modulation and demodulation device based on the fiber grating hydrophone array of the present invention includes: a laser 1, an optical pulse modulator 2, a circulator 3, a signal controller 4, fiber Bragg gratings 51-53, and induction coils 61-62 , an optical coupler 7, an optical fiber 8, a reflective phase modulator 9 with a Faraday rotating mirror, a Faraday rotating mirror 10, a photodetector 11, and an analog-to-digital converter 12; wherein: the laser 1 emits continuous light through the optical pulse modulator 2 After the intensity modulation, a series of first period pulsed light is obtained, which is input into the hydrophone array composed of fiber Bragg gratings 51-53 through the circulator 3; Refle...

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Abstract

The invention discloses a phase modulation and demodulation device based on a fiber grating hydrophone array. A fiber grating is used as a component of a hydrophone, and a reflection phase modulator with a Faraday rotating mirror is adopted, which makes the structure simpler and reduces the cost. Meanwhile, a PI/2 phase modulation method is adopted, two orthogonal signals can be directly separatedby sampling, and there is no need for general reference signal mixing and filtering. Thus, the complexity of the algorithm is simplified, the phase noise is reduced, and the system is more applicable.

Description

technical field [0001] The invention belongs to the technical field of hydrophone signal demodulation, and in particular relates to a phase modulation and demodulation device based on a fiber grating hydrophone array. Background technique [0002] Sound waves are the only form of energy that can travel long distances in the ocean, and hydrophones are the basic devices for detecting sound waves in the ocean. Optical fiber hydrophones have the characteristics of high sensitivity, strong anti-electromagnetic interference, and resistance to harsh underwater environments. With the development of marine science, large-scale and miniaturization have become an important direction for the development of optical fiber hydrophone arrays. However, with the deepening of the application, the traditional optical fiber hydrophone array has shown its limitations, mainly in the complex structure of the traditional hydrophone array, the small detectable dynamic range, and the complicated demod...

Claims

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Application Information

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IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 程志威金晓峰章献民池灏郑史烈余显斌
Owner ZHEJIANG UNIV
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