| 摘要 |
A fibre optical system for pressure measurement has a pressure sensor (4) with at least two parallel partially reflecting surfaces (5, 7), one of which is arranged on a diaphragm (6) movable with respect to another fixed said surface as a consequence of pressure differences across said diaphragm. Said surfaces are arranged so as to cause interference phenomena of light inciding substantially perpendicularly onto and reflected by the two surfaces depending upon the actual distance between these surfaces. The pressure sensor is made of material being stable at a continuous temperature up to at least 800°C. At least said diaphragm (6) of the sensor is made of SiC, and at least a part (23) of the optical fibre (3) connecting to said sensor is made of a material able to withstand a continuous temperature of at least 800°C.
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