Brillouin scattering spectrum real-time spectrum analyzing device and data processing method thereof

Abstract

The invention relates to a brillouin scattering spectrum real-time spectrum analyzing device and a data processing method thereof. The device comprises a low-pass filter, a low-noise amplifier, an analog-to-digital converter, an FPGA, a DSP and at least three memories, wherein the input end of the low-pass filter is connected with a brillouin scattering spectrum signal, the low-pass filter, the low-noise amplifier, the analog-to-digital converter and the FPGA are sequentially connected, all the memories and the FPGA are connected into a ping-pong structure, each memory circularly works according to the processes of storing time domain data->carrying out FFT processing-> outputting frequency domain data, which are sequentially and continuously carried out under the control of an FPFA, and the processed spectrum data is output in real time. The invention provides a high-speed data processing device for rapidly surveying and mapping BOTDR spectrograms in real time and a data processing method thereof; compared with the traditional method, the invention can greatly reduce the required time of surveying and mapping and provides the brillouin spectrum of an optical fiber to be measured in real time to capture the dynamic change information of strain or temperature.

Description

technical field [0001] The invention belongs to the field of high-speed data processing, relates to optical fiber sensing technology, and relates to a Brillouin scattering spectrum real-time spectrum analysis device and a data processing method of an optical time domain reflectometer (BOTDR) based on the Brillouin scattering effect. Background technique [0002] Brillouin scattering is a nonlinear effect that occurs during the transmission of light in an optical fiber. Brillouin scattering is produced by the interaction of photons and phonons, resulting in a frequency shift of the scattered light relative to the incident light. The magnitude of the frequency shift is proportional to the sound velocity of the material, and the sound velocity is related to the strain or temperature of the fiber. Typical The frequency shift is about tens of gigahertz. Because of its existence, the optical signal produces transmission loss, which is not good for signal transmission, but this ef...

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Problems solved by technology

[0006] The problem to be solved by the present invention is: the current BOTDR data processing method takes a long time, does not have real-time performance, relies on the processing capability of the host computer for data analysis and processing, and cannot provide the Brillouin spectrum in real time. A fast and real-time method is needed. Real-time spectrum analysis device for surveying and mapping BOTDR spectrum diagram and its data processing method

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