A gated optical multichannel analyzer was used to detect the Rayleigh and Raman shifted backscatter in a UV grade silica fiber using a pump laser at 337 nm. The temperature dependence of the anti-Stokes to Rayleigh ratio, at 337 nm, was demonstrated and used as the basis for a distributed temperature sensor. Temperatures from 293 K to 483 K were measured with a spatial resolution of 0.5 m.
Andrew T. Paton,
J. Chris Scott,
"UV optical fiber distributed temperature sensor", Proc. SPIE 1367, Fiber Optic and Laser Sensors VIII, (1 February 1991); doi: 10.1117/12.24754; https://doi.org/10.1117/12.24754