Abstract
- II -
Abstract
The Distributed optical fiber Temperature measurement System(DTS) can detcect the
optical fiber temperature change over time in different location information continuously
that using an ordinary optical fiber as a sensing element and signal transmision medium.
Optical frequency domain after reflection technique (OFDR) is based on the analysis to the
characteristics of the reflected light in frequency domain to obtain the temperature
information , its improvement of spatial resolution is not dependent on the bandwidth of
the light source and the receiver. so compared with technology of OTDR, OFDR is
becoming a research hotspot at present as an emerging technology because of its low noise,
low power, the advantages of shorter testing time .
This article first carries on the comparison to different DTS model, and points out that
the advantages and characteristics of OFDR . It carries out the formula derivation on the
model of distributed optical fiber temperature measurement based on ROFDR.Secondly
this thesis designed the light source drive and modulation circuit, APD bias and sampling
circuit, and analyzed the subsequent amplification circuit parameters, these circuits can be
used for the follow-up test platform building work reference. Finally, the paper puts
forward the model of single-channel collection; we can demodulate the information of
temperature only through the antistokes single information from sampling circuit of the
system; meanwhile,this paper analyses the selection of optical fiber mode and the system
resolution, simulates the temperature distribution in the single-mode fiber, and analyzes the
discretization error.
Through simulation analysis, when using single channel model, single mode fiber is
more suitable for use in long range; resolution is associated with modulation frequency
Settings, single-channel model discretization error is greater than dual model’s. so the
single channel model has a certain practicality in the small cost request ,long distances and
low error environment .
Key words: Raman scattering; DTS;ROFDR; The spatial resolution; Single-channel
collection
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