| 摘要 |
<p>A method for use in determining pressure comprises configuring first and second strain sensors to sense respective strain signals along a common direction in a carrier member, the first and second strain sensors having a different response to pressure exerted on the carrier member. The sensors comprise a central optical fibre 34 and four peripheral optical fibres 36,38,40,42. Each optical fibre is coupled to a strain interrogation system (60 to 68, figure 1) and each system includes a pulsed laser source (70) coupled via an optical coupler (72) to the appropriate optical fibre and an optical detector (74) for monitoring power transmitted by the pulsed laser source (70). The method further comprises determining a pressure from the respective strain signals sensed using the first and second strain sensors. Such a method may permit the effects of pressure exerted on the carrier member to be distinguished from the effects of mechanically-induced strain exerted on the carrier member thus allowing a pressure to be determined. Such a method may be particularly useful for providing a distributed pressure profile in a remote or hostile environment such as a subterranean or subsea oil or gas well.</p> |
