FPGA-based high-speed demodulation apparatus and method of weak fiber grating

A technology of weak fiber gratings and demodulation devices, which is applied in the direction of using optical devices to transmit sensing components, can solve the problems of large data volume, long detection distance, and high spatial resolution, and solve the bottleneck and long-term problems of data storage and transmission. The effect of distance demodulation

Active Publication Date: 2018-04-20
WUHAN WUTOS
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Problems solved by technology

The weak fiber grating sensor network has a long detection distance and high spatial resolution, and the amount of data that needs to be stored and processed is very large. The traditional sequential processing method is to collect data through the data acquisition unit, store the collected data and then transmit it

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  • FPGA-based high-speed demodulation apparatus and method of weak fiber grating
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  • FPGA-based high-speed demodulation apparatus and method of weak fiber grating

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Embodiment Construction

[0042] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0043]The embodiment of the present invention is based on the FPGA-based weak fiber grating high-speed demodulation method, comprising the following steps:

[0044] Use FPGA to process multi-channel data in parallel, and perform parallel pipeline processing on each channel, including:

[0045] S1. Receive the sampling data of the current cycle of the ADC device through the FPGA device, and the rising edge of the pulse triggers the collection of n data, each data corresponds to the reflected signal of a different spatial position, there are m pulses in each cycle, and each pulse corresponds to a dif...

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Abstract

The invention discloses an FPGA-based high-speed demodulation apparatus and method of a weak fiber grating. An FPGA is used for carrying out parallel processing on multi-channel data and carrying outparallel pipeline processing on each channel. The demodulation apparatus is composed of an ADC device and an FPGA device. Each channel of the FPGA device consists of an ADC sampling module, a data accumulation module, a grating positioning module, a spectrum splicing module, and a wavelength demodulation and sending module. The ADC sampling module is used for receiving data of the ADC device, carrying out triggering and collection of n data along a rising edge of a pulse, wherein each cycle has m pulses and each channel collects m*n data within one cycle. The data accumulation module is used for accumulating the collected data according to columns. The grating positioning module is used for carrying out peak searching on the accumulation and sequence. The spectrum splicing module is used for extracting respective spectrums from each grating space position based on grating spatial position information. The wavelength demodulation and sending module is used for carrying out peak searching on grating spectrums to obtain wavelengths of all gratings and sending out demodulation results.

Description

technical field [0001] The invention relates to the field of fiber grating sensing, in particular to an FPGA-based high-speed demodulation device and method for weak fiber gratings. Background technique [0002] Due to the advantages of strong multiplexing capability, low crosstalk, and high cost performance, weak fiber gratings are widely used in the fields of fire alarm, safety fence and other sensing and monitoring. The weak fiber grating sensor network has a long detection distance and high spatial resolution, and the amount of data that needs to be stored and processed is very large. Now the traditional sequential processing method is to collect data through the data acquisition unit, store the collected data and then transmit it to the data processing unit The demodulation process is carried out, but the storage of collected data and the data transmission between the data acquisition unit and the data processing unit become bottlenecks for further improving the sensing...

Claims

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Application Information

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IPC IPC(8): G01D5/353
CPCG01D5/353
Inventor 钱磊董雷李凯
Owner WUHAN WUTOS
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