Multi-phase data acquisition method and system for DTS, and storage medium

Abstract

The invention discloses a multi-phase data acquisition method and system for a DTS and a storage medium. The method comprises the following steps: emptying cache data in a cache region in an FPGA; using the FPGA to trigger a laser to start to emit an optical pulse signal, after T1 time is delayed, making the FPGA trigger an ADC sampling unit to start a first round of signal acquisition at a fixedsampling interval of 1 / Fs, and storing data in a first cache region of the FPGA; using the FPGA to trigger the laser to emit the pulse signal again, after T2 time is delayed, making the FPGA trigger the ADC sampling unit to start a second round of acquisition again with the fixed sampling interval of 1 / Fs, and storing the data in a second cache region of the FPGA; carrying out n rounds of acquisition in the same manner and carrying out M times of circulation; and combining each group of data in the first cache region to the nth cache region into a group of sampling data with a sampling interval of delta T according to a Stokes signal and an anti-Stokes signal, and writing the group of sampling data into DDR. On the premise of not changing a sampling frequency of a DTS system, acquisition density of sensing data of the DTS system is improved, and the accuracy of temperature measurement of the DTS system is increased.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a multi-phase data acquisition method, system and storage medium for DTS. Background technique [0002] DTS (Distributed Optical Fiber Temperature Measurement System) generally includes a laser, an optical coupler, an optical fiber, a receiver and a data processor, and the receiver is equipped with an ADC sampling unit. [0003] The pulse signal emitted by the laser produces backward Raman scattering during transmission, and the receiver collects the amplified Stokes signal and anti-Stokes signal at a fixed frequency through the ADC sampling unit. The Stokes signal and anti-Stokes signal are transmitted in the optical fiber at a fixed rate, and the working frequency of the ADC sampling unit determines the distance between two adjacent signals, thus determining the temperature measurement accuracy of the DTS system. In order to improve the measurement accuracy of th...

AI Technical Summary

Problems solved by technology

In order to improve the measurement accuracy of the system, you can choose to increase the working frequency of the ADC sampling unit of the receiver, but increasing the working frequency of the ADC sampling unit also has higher requirements on the working frequency of the trigger signal source of the ADC sampling unit, and the design difficulty and cost of the entire DTS system will greatly improve

Images