We present distributed temperature measurement in fiber to 850C.

We present the use of swept wavelength interferometry for distributed fiber-optic, temperature measurements of up to 850 0C over a 1m fiber segment in commercially available, single mode, gold coated fiber. The interrogation technique is based on measuring the spectral shift of the intrinsic Rayleigh backscatter signal along the optical fiber and converting the spectral shift to temperature.

A. K. Sang et al., "One Centimeter Resolution Temperature Measurements from 25 to 850° C Using Rayleigh Scatter in Gold Coated Fiber," Quantum Electronics and Laser Science Conf., Baltimore, MD, 2007.