Dual-wavelength optical frequency domain reflection device and method for Doppler frequency shift suppression

Abstract

The invention belongs to the technical field of optical fiber sensing, and particularly relates to a Doppler frequency shift suppression dual-wavelength optical frequency domain reflection device and method, and the device comprises a frequency sweeping laser emission unit, a light splitting interference unit, a to-be-measured optical fiber and a data acquisition and processing unit which are connected. The sweep frequency laser emission unit is used for emitting upper sweep frequency laser and lower sweep frequency laser with different initial wavelengths; the light splitting interference unit is used for splitting a combined light path of the upper sweep-frequency laser and the lower sweep-frequency laser into a detection path and a local oscillation path, a to-be-detected optical fiber is arranged on the detection path, the sweep-frequency laser is injected into the to-be-detected optical fiber, and a generated backward scattered light or reflected light signal enters the detection path to form a detection path echo signal; the output end of the light splitting interference unit is connected with the data acquisition and processing unit, and the light splitting interference unit is used for performing interference processing on the echo signal of the detection path and the optical signal of the local oscillation path, combining and outputting to the data acquisition and processing unit for analysis and processing; the invention also provides a Doppler frequency shift suppressed dual-wavelength optical frequency domain reflection method using the device.

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