Method for demodulating phase carrier in Fabry-Perot interference type optical fiber hydrophon
A technology of optical fiber hydrophone and phase carrier, applied in the direction of optical demodulation, optics, instruments, etc., can solve the problems of interference and inability to use F-P directly, achieve the problem of solving parasitic amplitude modulation, high phase sensitivity, and broaden the scope of application Effect
Inactive Publication Date: 2011-01-26
HARBIN ENG UNIV
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However, due to multi-beam interference, the mature PGC detection technology cannot be directly used for F-P interference
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The invention provides a method for demodulating a phase carrier in a Fabry-Perot (F-P) interference type optical fiber hydrophone, which is characterized by comprises the following steps: incident light is split into two beams according to a beam intensity ratio of 1:4, and one path of the beam has the light intensity of I0 through direct photoelectric detection, while the other path is shot into an optical fiber F-P cavity through a cascaded 3dB coupler; after the multiple-beam interference is formed, the reflected light intensity IR is measured; the I0 and the IR achieve that the system output is 1 / T=I0 / (I0-IR) through a hardware or software algorithm of a subtractor and a divider; and then the PGC demodulation is performed so as to obtain phase output. A method for applying a PGC demodulation technique in an F-P multiple-beam interference system is provided by performing reciprocal operation on an F-P cavity transmissivity and adopting new optical path design. The application range of the PGC demodulation is widened. The method can achieve signal demodulations for all F-P interferometers requiring the use of phase detections.
Description
(1) Technical field The invention relates to a system output detection method of a Fabry-Perot interference type fiber optic hydrophone, specifically, the method of the present invention can be used in the Fabry-Perot interference type fiber optic hydrophone to realize phase carrier The use of demodulation technology. (2) Background technology Optical fiber hydrophones have high sensitivity, small size and light weight, and are not subject to electromagnetic interference; vector hydrophones have good low-frequency and infra-frequency performance, and do not produce obvious sound field distortion. They can be regarded as point receivers, so its Good directivity, stable performance parameters, can be used for precise measurement or long-term measurement. Combining the advantages of both will have an important impact on the future development of underwater acoustic detection technology. The current focus is to develop the fiber optic vector hydrophone unit in the towed line a...
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IPC IPC(8): G01H9/00G02F2/00
Inventor 康崇董云吉刘佳杰
Owner HARBIN ENG UNIV