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Abstract

Apparatus for the measurement of unsteady gas temperatures comprises (a) a temperature probe having a sensing element. The sensing element has an optical interferometer optically coupled to one end of a first, addressing optical fibre. The interferometer has a first partially reflective surface defined at the end of the addressing fibre and a second partially reflective surface spaced from the first partially reflective surface by an optical path length I. The apparatus further comprises (b) a light source optically coupled to a second end of the addressing fibre, (c) an interrogating optical path optically coupled to the addressing fibre by a beam splitter whereby a portion of an optical phase signal from the sensing element is directed to a first end of the interrogating path and a portion of the input light from the light source is directed to a second end of the interrogating path, (d) first photodetector coupled to the first end of the interrogating path; and (e) data acquisition and processing means connected to the photodetector means, the data acquisition and processing means being adapted to derive the temperature of the sensing element from the phase signal.

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