Article
Version 1
Preserved in Portico This version is not peer-reviewed
Distributed Temperature Sensing through Network Analysis Frequency-Domain Reflectometry
Version 1
: Received: 24 February 2024 / Approved: 26 February 2024 / Online: 26 February 2024 (12:57:59 CET)
A peer-reviewed article of this Preprint also exists.
Zahoor, R.; Vallifuoco, R.; Zeni, L.; Minardo, A. Distributed Temperature Sensing through Network Analysis Frequency-Domain Reflectometry. Sensors 2024, 24, 2378. Zahoor, R.; Vallifuoco, R.; Zeni, L.; Minardo, A. Distributed Temperature Sensing through Network Analysis Frequency-Domain Reflectometry. Sensors 2024, 24, 2378.
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 obtained by coherently mixing the Rayleigh backscattered light with a local oscillator. The system is capable of high measurand resolution (50 mK at 3-cm spatial resolution), thanks to the high sensitivity of coherent Rayleigh scattering to temperature. Furthermore, compared to the conventional optical-frequency domain reflectometry (OFDR), the proposed system does not rely on the use of a tunable laser, therefore it 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.
Keywords
Distributed temperature sensing; Rayleigh scattering; Optical Frequency-Domain Reflectometry.
Subject
Engineering, Electrical and Electronic Engineering
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Comments (0)
We encourage comments and feedback from a broad range of readers. See criteria for comments and our Diversity statement.
Leave a public commentSend a private comment to the author(s)
* All users must log in before leaving a comment