CN106092157A

CN106092157A - Distributed optical fiber sensing system

Info

Publication number: CN106092157A
Application number: CN201610671276.1A
Authority: CN
Inventors: 姚峰
Original assignee: Guilin Tryin Technology Co Ltd
Current assignee: Guilin Tryin Technology Co Ltd
Priority date: 2016-08-15
Filing date: 2016-08-15
Publication date: 2016-11-09

Abstract

The present invention provides distributed optical fiber sensing system, is provided with analog-to-digital conversion module, FPGA module, DSP module and memory module, and each module all uses high accuracy chip, to ensure to improve computational accuracy, shorten the measurement time；It is respectively provided with clock signal for analog-to-digital conversion module, DSP module and FPGA module, to ensure that each modular high-performance runs, improves system accuracy further, shorten the measurement time further；Accurately power supply is set for each module, to ensure that each module stability runs, improves the stability of system.

Description

Distributed optical fiber sensing system

Technical field

The present invention relates to sensory field of optic fibre, particularly relate to distributed optical fiber sensing system.

Background technology

Sensor-based system is the key component of distributed fiberoptic sensor, directly influences the certainty of measurement of whole system, sky Between resolution, measurement time etc., there is the shortcoming that precision is the highest, the measurement time is longer in existing sensor-based system.

Summary of the invention

The present invention provides distributed optical fiber sensing system, solve existing sensor-based system exist precision low, measure the time long Problem.

Distributed optical fiber sensing system, including analog-to-digital conversion module, FPGA module and DSP module；Described analog digital conversion The input signal of module is Stokes signal and Anti-Stokes signal, and the output signal of analog-to-digital conversion module inputs extremely In FPGA module；One road signal output of FPGA module exports to DSP mould to memory module, another road signal of FPGA module Block；One road signal output of DSP module exports to exterior terminal to memory module, another road signal of DSP module.

Farther include power module；Described power module is analog-to-digital conversion module, FPGA module, DSP module and deposits Storage module for power supply.

Farther include clock module；The two paths of signals of described clock module exports respectively to FPGA portion and DSP part.

Described analog-to-digital conversion module is ADS62P25.

Described DSP module is TMS320VC5416.

Compared with prior art, have a characteristic that

1, being provided with analog-to-digital conversion module, FPGA module, DSP module and memory module, each module all uses high accuracy chip, To ensure to improve computational accuracy, shorten the measurement time；

2, it is respectively provided with clock signal for analog-to-digital conversion module, DSP module and FPGA module, to ensure that each modular high-performance is transported OK, improve system accuracy further, shorten the measurement time further；

3, accurately power supply is set for each module, to ensure that each module stability runs, improves the stability of system.

Accompanying drawing explanation

Fig. 1 is present configuration theory diagram.

Detailed description of the invention

Below in conjunction with embodiment, the invention will be further described, but the invention is not limited in these embodiments.

Reliability, stability, maintainability and autgmentability need to be possessed, tool when distributed optical fiber sensing system carries out data acquisition Body relates to the factors such as modulus sample frequency, modulus sampling precision, cache size, DSP processing speed, system power dissipation, system cost. The distributed optical fiber sensing system that the present invention provides, including analog-to-digital conversion module, FPGA module and DSP module；Analog digital conversion The input signal of module is Stokes signal and Anti-Stokes signal, and the output signal of analog-to-digital conversion module inputs extremely In FPGA module；One road signal output of FPGA module exports to DSP mould to memory module, another road signal of FPGA module Block；One road signal output of DSP module exports to exterior terminal to memory module, another road signal of DSP module.Bag further Include power module；Described power module is that analog-to-digital conversion module, FPGA module, DSP module and memory module are powered.Further Including clock module；The two paths of signals of clock module exports respectively to FPGA portion and DSP part.DSP module is TMS320VC5416。

The present invention is active structure, and DSP module is main frame, and FPGA module is from machine, DSP module be used for carrying out a large amount of, Complicated signal processing computing, FPGA module is used for carrying out logic control.Stokes signal and Anti-Stokes signal are defeated Enter and carry out analog digital conversion to analog-to-digital conversion module, obtain 12 position digital signals, input to FPGA module parallel, FPGA module enter Row reads, and two ways of digital signals is simultaneously entered to memory module, and memory module is multiple SRAM, FPGA mould The output signal of block inputs well to DSP module, signal adds up by DSP module, averagely, noise reduction and demodulation, be used for improving The signal to noise ratio of transducing signal, and to the temperature value of outside terminal transmission demodulation.Whole system, with DSP module as core, passes through DSP Module sends reception preparation instruction, starts the reception of FPGA module, judges initial data by the lock-out pulse of laser instrument and open Begin to receive.

Modulus sampling rate and precision can affect the quality of signal processing, and determine spatial resolution and the temperature of final result Degree degree of accuracy.Because Raman scattering luminous power changed power under unit temperature is the most small, analog digital conversion the most of the present invention Module uses high-precision two-way analog digital conversion, and sampling rate is 80-100MHz.The analog-to-digital conversion module of the present invention is ADS62P25.Stokes signal and Anti-Stokes signal are with in difference form input to analog-to-digital conversion module, to ensure High-quality, with high accuracy sample.In the analogue signal stage, differential signal can filter even-order harmonic component, common mode disturbances letter Number, be conducive to improving ADS62P25 performance.The generation of differential signal is realized by chip THS4509, and THS4509 has the poorest Divide the characteristics such as logical structure, signal amplifying function, bandwidth 1900MHz.

FPGA module is Programmadle logic device, has that capacity of resisting disturbance is strong, processing speed is fast, circuit cost is high, uses The advantage such as convenient, for receiving high speed, the high-precision data stream that analog-to-digital conversion module transmission comes, carries out the most slow to data stream Depositing and logic control, FPGA module is EP2C8F256C8.

DSP module is TMS320vC5416, and the high-volume sampled for storing and process analog-to-digital conversion module counts in real time According to, the highest arithmetic speed can reach 160MIPS, have three independent memory spaces: program, data and input and output are empty Between, its CPU fast operation, internal resource abundance, interface flexible, low in energy consumption, it is especially suitable for doing high-volume real time data computing.

The storage speed of memory module is related to stability and the degree of accuracy of the present invention, is used for storing data and program, deposits Storage module is CY7C1041, is used for caching continuous print data stream, including caching Stokes, Anti-Stokes signal, DSP program And pending data, prevent from losing data when transmission and storage operation.

Power module is for powering for analog-to-digital conversion module, FPGA module, DSP module and memory module.Power module The power supply provided is+5V ,+4V ,+3.3V ,+1.8V ,+1.5V ,+1.2V and-1V.The shake of power supply and rated power deficiency are all The differential signal output of chip will be affected.

Clock module is for providing high-precision clock signal, to ensure its steady operation for FPGA module and DSP module. Clock module is produced by external crystal oscillator.The clock signal of DSP module is realized by internal frequency multiplication of phase locked loop.FPGA module Clock signal is realized by internal frequency multiplication of phase locked loop.The clock signal of analog-to-digital conversion module is produced clock signal by FPGA module, real Existing single ended clock turns differential clocks.The clock signal of analog-to-digital conversion module requires high-quality, the sampling clock of low phase error, Asking clock jitter little, signal to noise ratio is little, to ensure sampling precision.

Spontaneous Raman scattering in optical fiber produces stokes light and anti-Stokes light, stokes light temperature influence Less, anti-Stokes light is then very sensitive to temperature.Short pulse rushes high power laser and produces pulsed light, after Wavelength division multiplexing module Send into sensor fibre, sensor fibre produces lentor signal and Anti-Stokes signal, wavelength division multiplexer distinguishes two-way Light, sends into photodetector, and this two-way light and short pulse rush the pulsed light of high power laser, and input is to analog-to-digital conversion module, warp After FPGA module and DSP module process, input is managed to exterior terminal and shows.

Claims

1. distributed optical fiber sensing system, it is characterised in that: include analog-to-digital conversion module, FPGA module and DSP module；Described The input signal of analog-to-digital conversion module is Stokes signal and Anti-Stokes signal, the output signal of analog-to-digital conversion module Input to FPGA module；One road signal output of FPGA module exports extremely to memory module, another road signal of FPGA module DSP module；One road signal output of DSP module exports to exterior terminal to memory module, another road signal of DSP module.

Distributed optical fiber sensing system the most according to claim 1, it is characterised in that: farther include power module；Institute Stating power module is that analog-to-digital conversion module, FPGA module, DSP module and memory module are powered.

Distributed optical fiber sensing system the most according to claim 1, it is characterised in that: farther include clock module；Institute The two paths of signals stating clock module exports respectively to FPGA portion and DSP part.

Distributed optical fiber sensing system the most according to claim 1, it is characterised in that: described analog-to-digital conversion module is ADS62P25。

Distributed optical fiber sensing system the most according to claim 1, it is characterised in that: described DSP module is TMS320VC5416。