A Distributed Optical Fiber Sensing System Based on Heterodyne Detection Technology
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A distributed optical fiber, heterodyne detection technology, applied in measurement devices, ultrasonic/sonic/infrasonic waves, instruments, etc. Application potential, effect of long monitoring distance
Active Publication Date: 2021-07-02
JILIN UNIV
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[0005] In view of this, the present invention provides a distributed optical fiber sensing system based on heterodyne detection technology to solve the technical problems of the influence of the frequency drift of the acousto-optic frequency shifter on subsequent signal demodulation and the real-time acquisition and processing of large signals
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[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0035]Embodiment 1 of the present invention discloses a distributed optical fiber sensing system based on heterodyne detection technology, including: a laser light source (1), a first coupler (2), an acousto-optic frequency shifter (3), a second coupler device (4), electro-optic modulator (5), optical isolator (6), fiber amplifier (7), circulator (8), fiber grating (9), sensing fiber (10), third coupler (11 ), 90° optical mixer (12), fourth coupler (13), fifth...
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Abstract
The invention discloses a distributed optical fiber sensing system based on heterodyne detection technology, which belongs to the field of optical fiber sensing. Including: laser light source (1), first coupler (2), acousto-optic frequency shifter (3), second coupler (4), electro-optic modulator (5), optical isolator (6), fiber amplifier ( 7), circulator (8), fiber grating (9), sensing fiber (10), third coupler (11), 90° optical mixer (12), fourth coupler (13), fifth Coupler (14), sixth coupler (15), first balanced photodetector (16), second balanced photodetector (17), first low-pass filter (18), second low-pass filter (19), data acquisition card (20), signal processor (21), pulse generator (22). The advantages are: low cost, high reliability, strong real-time monitoring capability, long monitoring distance, can realize the restoration and positioning of vibration and acoustic signals, and has broad application prospects.
Description
technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a distributed optical fiber sound sensing and positioning system, in particular to a distributed optical fiber sensing system based on heterodyne detection technology. Background technique [0002] At present, distributed optical fiber vibration sensors mainly include interferometric sensors and backscattering sensors. Interferometric sensors mainly include Sagnac interferometers, Mach-Zehnder interferometers (MZI), and Michelson interferometers (MI), which have made great contributions to the wide-range monitoring of fiber optic vibration sensors. Backscattering sensors use changes in the polarization, light intensity, frequency shift, and phase of backscattered light to measure external physical quantities. It mainly includes phase-sensitive optical time domain reflectometer (Φ-OTDR), polarized optical time domain reflectometer (P-OTDR) and phase-sensitive optica...
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