Signal demodulation method of portable multifunctional optical fiber hydrophone

A fiber-optic hydrophone and signal demodulation technology, which is applied in angle demodulation through phase difference detection, instruments, measuring devices, etc., can solve problems such as difficult research, large footprint, and inconvenient movement

Inactive Publication Date: 2009-12-30
THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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Problems solved by technology

At present, when conducting research on fiber optic hydrophones and fiber optic hydrophone arrays, general-purpose signal acquisition cards, signal sources, and PCs are usually used to build test...

Method used

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  • Signal demodulation method of portable multifunctional optical fiber hydrophone
  • Signal demodulation method of portable multifunctional optical fiber hydrophone
  • Signal demodulation method of portable multifunctional optical fiber hydrophone

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Embodiment Construction

[0049] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0050] The system block diagram of the portable multifunctional optical fiber hydrophone signal demodulation method of the present invention is as follows figure 1 shown. The three-way analog input is connected to the A / D conversion module after the signal conditioning circuit, the A / D conversion module is connected to the FPGA, the four-way D / A conversion module is connected to the FPGA, and the output of the D / A conversion module is connected to the signal conditioning circuit to output analog The voltage signal, the FPGA chip and the DSP chip are connected through the external bus interface, the FPGA performs handshaking with the DSP through the IRQ, DMAR, FLAG signals, and the FPGA controls the reset, startup and program loading of the DSP.

[0051] FPGA internal modules such as figure 2As shown, including Nios II embedded soft...

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Abstract

The invention relates to a signal demodulation method of a portable multifunctional optical fiber hydrophone, comprising the following steps: three-path analog input is accessed into an A/D conversion module after passing through a signal conditioning circuit, the A/D conversion module is connected with an FPGA, four-path D/A conversion module is connected with the FPGA, an output end of the D/A conversion module is connected with an output analog voltage signal of the signal conditioning circuit, an FPGA chip is connected with a DSP chip by an external bus interface, and the FPGA is used for controlling the DSP to reset, start and load program; a flash memory is internally stored with 3*3 coupler digital demodulation algorithm DSP program and PGC quadrature complex demodulation algorithm DSP program which are uploaded into the DSP by the FPGA according to the selection of the user, so that one-path 3*3 coupler digital demodulation or three-path PGC digital demodulation can be realized. The signal demodulation method has the advantages of low energy consumption and cost as well as being portable and multifunctional, so as to provides a reliable, fast and convenient tool for the study of the optical fiber hydrophone and array thereof.

Description

technical field [0001] The invention relates to the field of optical fiber hydrophone signal phase demodulation, and mainly relates to a portable multifunctional optical fiber hydrophone signal demodulation method. Background technique [0002] Interferometric fiber optic hydrophones are a new type of hydrophone developed in the late 1970s. Compared with piezoelectric ceramic hydrophones, fiber optic hydrophones have the advantages of easy adjustment of sensitivity, easy array multiplexing, and array resistance. Due to the advantages of strong electromagnetic interference capability and fewer components to form large-scale arrays, fiber optic hydrophones and array technologies have developed rapidly in recent years. [0003] Signal demodulation is a key technology in the development and application of fiber optic hydrophones and arrays. Since the acoustic signal is modulated in the output signal of the interferometric hydrophone in the form of phase modulation, the output s...

Claims

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Application Information

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IPC IPC(8): H03D3/06G01H9/00
Inventor 谢勇葛辉良张自丽
Owner THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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