Time-resolved fibre optic distributed temperature sensing with CMOS SPAD arrays

Caitlin Tye, Katjana Ehrlich, Andrew Green, Michael G. Tanner

Research output: Contribution to conferencePosterpeer-review

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Time-resolved fibre optic distributed temperature sensing maps out the temperature profile along the length of an optical fibre, using time of photon travel to determine location. One of the main benefits of using an optical fibre as a temperature sensor is that the optical fibre can replace multiple individual sensors [1]. Additionally, the flexibility and size of the optical fibre enable access to otherwise inaccessible environments such as mountain snowpacks or under lakes [2].
Here we present temperature measurements along an optical fibre using a 512 pixels complementary-metal-oxide semiconductor (CMOS) single-pixel avalanche diode (SPAD) line sensor array. In time correlated single photon counting (TCSPC) mode this obtains the intensity of the backscattered Raman light from the fibre as a function of time and wavelength. The arrival time of the backscattered photons is used to determine the position of the Raman scattering in the fibre. At the different scattering positions, the temperature of the fibre is obtained by taking the ratio of the temperature dependent Raman Stokes (red-shifted) and Raman anti-Stokes (blue-shifted) scattering. In contrast to previous work based on individual detectors [1], the use of a SPAD array with integrated (on-chip) timing electronics allows multiplexed single photon counting where numerous detectors measure the Stokes / anti-Stokes signals simultaneously. This increases count rate, and therefore decreases measurement time for practical application.


[1]M. Tanner, S. Dyer, B. Baek, R. Hadfield and S. Woo Nam, "High-resolution single-mode fiber-optic distributed Raman sensor for absolute temperature measurement using superconducting nanowire single-photon detectors", Applied Physics Letters, vol. 99, no. 20, p. 201110, 2011. Available: 10.1063/1.3656702.

[2]M. Hausner, F. Suárez, K. Glander, N. Giesen, J. Selker and S. Tyler, "Calibrating Single-Ended Fiber-Optic Raman Spectra Distributed Temperature Sensing Data", Sensors, vol. 11, no. 11, pp. 10859-10879, 2011. Available: 10.3390/s111110859.
Original languageEnglish
Publication statusPublished - 1 Sept 2022
EventPhoton 2022 - Nottingham
Duration: 30 Aug 20222 Sept 2022
Conference number: 11


ConferencePhoton 2022
Internet address


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