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- Title
Distributed Temperature Sensing through Network Analysis Frequency-Domain Reflectometry.
- Authors
Zahoor, Rizwan; Vallifuoco, Raffaele; Zeni, Luigi; Minardo, Aldo
- Abstract
In this paper, we propose and demonstrate a network analysis optical frequency domain reflectometer (NA-OFDR) for distributed temperature measurements at high spatial (down 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 formed by coherently mixing the Rayleigh backscattered light with a local oscillator. The system is capable of attaining high measurand resolution (≈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 therefore 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.
- Subjects
REFLECTOMETRY; FREQUENCY-domain analysis; RAYLEIGH scattering; TUNABLE lasers; PYROMETRY; X-ray reflectometry; SPATIAL resolution; RAYLEIGH waves
- Publication
Sensors (14248220), 2024, Vol 24, Issue 7, p2378
- ISSN
1424-8220
- Publication type
Article
- DOI
10.3390/s24072378