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Distributed Temperature Sensing through Network Analysis Frequency-Domain Reflectometry
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DOI：10.3390/s24072378.png)
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摘要
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In this paper, we propose and demonstrate a network analysis optical frequency domain reflectometer (NA-OFDR);
distributed temperature measurements at high spatial (down to approximate to 3 cm) and temperature resolution. The system makes use of a frequency-stepped, continuous-wave (cw) laser whose output light is modulated using a vector network analyzer. The latter is also used to demodulate the amplitude of the beat signal;
med by coherently mixing the Rayleigh backscattered light with a local oscillator. The system is capable of attaining high measurand resolution (approximate to 50 mK at 3-cm spatial resolution) thanks to the high sensitivity of coherent Rayleigh scattering to temperature. Furthermore, unlike the conventional optical-frequency domain reflectometry (OFDR), the proposed system does not rely on the use of a tunable laser and there;
e is less prone to limitations related to the laser coherence or sweep nonlinearity. Two configurations are analyzed, both numerically and experimentally, based on either a double-sideband or single-sideband modulated probe light. The results confirm the validity of the proposed approach.
Keyword:
distributed temperature sensing
rayleigh scattering
optical frequency-domain reflectometry
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IF:
3.5
论文数:
7.2W
被引数:
20.9W
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