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

A technology of real-time spectrum analysis and spectrum analysis device, which is applied in the direction of spectrum investigation and the use of optical devices to transmit sensing components, etc., can solve the problems of long time consumption, inability to give Brillouin spectrum in real time, and lack of real-time performance, so as to improve The effect of time efficiency

Inactive Publication Date: 2010-08-25
NANJING FAAIBO OPTOELECTRONICS TECH
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  • Abstract
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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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  • Brillouin scattering spectrum real-time spectrum analyzing device and data processing method thereof
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  • Brillouin scattering spectrum real-time spectrum analyzing device and data processing method thereof

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[0022]As shown in Figure 1, the continuous light emitted by the narrowband continuous wave laser 1 in the BOTDR system is divided into two paths by the 95:5 coupler 2, the detection light path and the local reference light path. In the detection optical path, after the detection light is modulated into the detection pulse light by the electro-optic modulator 3, it is injected into the sensing fiber 5 through the circulator 4, and the detection pulse light is generated in the sensing fiber 5, and then emits Rieouin scattered light ( Including Stokes and anti-Stokes light) and Rayleigh scattered light to obtain backscattered light, this backscattered light is the signal light to be detected. The signal light passes through the circulator 4 and enters the 50:50 coupler 10 to be coherent with the reference light; in the local reference light path, the other continuous light from the 95:5 coupler 2 passes through the polarization controller 6 and enters the electro-optic modulator 7...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353G01D5/26G01J3/28
Inventor 张旭苹王顺张益昕朱帆
Owner NANJING FAAIBO OPTOELECTRONICS TECH
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