| 摘要 |
A remote pressure sensor includes means for temperature compensation. The sensor (11) is coupled to a remote station (12) via an optical fibre link (13) and modulates incident light with a first signal corresponding to pressure and a second signal corresponding to temperature. The remote station recovers the two signals to provide a temperature compensated pressure measurement. In the embodiment the pressure sensor (11) is of the kind including a flexible element which vibrates at a frequency representing the pressure, and thereby amplitude- or frequency-modulates the incident radiation. The sensor may be provided with a temperature-dependent layer (16) of e.g. gallium arsenide, which returns frequency-shifted light, the amount of the frequency shift representing the temperature. <IMAGE> |
