公开(公告)号：WO99044026A1

公开(公告)日：1999-09-02

申请号：PCT/CH1999/000065

申请日：1999-02-12

IPC: G01L9/00 ,  G01L11/02

CPC classification number: G01L9/0007 ,  G01L9/0032 ,  G01L11/025

Abstract: The invention relates to a wavelength-coded pressure sensor (1) with fibre-integrated Bragg grating, which is especially suitable for use at high pressures and temperatures in oil wells. The sensor principle provided for in the invention is based on the fact that the hydrostatic pressure of a liquid or gaseous medium (11) is converted by means of a transducer (1) into a longitudinal lengthening or compression of the fibre. The transducer (1) comprises a measurement or pressure cylinder (7a) which exchanges pressure with the medium (11), and a reference cylinder (7b) which is shielded from the medium (11) or subjected to a counter pressure. Temperature-compensated transducers (1) with a temperature-independent Bragg wavelength lambda B can be obtained because a suitable temperature-dependence of the mechanical prestressing of the pressure sensor fibre (3) is achieved through the selection of the materials, lengths and arrangements of the fibre holder support (5a, 5b). A fibre-integrated Bragg grating temperature sensor (19, 20) can also be provided. The invention further relates to transducers (1) with different cylinder arrangements (7a, 7b) and a wavelength multiplex configuration comprising several transducers (1).

Abstract translation: 本发明具有波长编码的光纤布拉格光栅压力传感器（1），其特别适合于在高温和在油井压力使用的对象。 本发明的传感器的原理是基于一个液体或气体介质（11）的静水压力被转换成纵向纤维膨胀或压缩纤维由换能器（1）的装置。 所述换能器（1）包括测量或压力缸（图7a），这是在与所述介质（11）的压力连通，并从所述介质（11）屏蔽或相对的压力加载的基准气缸（图7b）。 一种温度补偿的换能器（1）与温度无关的布拉格波长为λB的从而认识到，通过的材料，长度和光纤夹持器支持的安排的选择压力传感器纤维（3）的机械预拉伸的适当温度依赖性（5A，5B）被引入。 另外，也可以设置光纤布拉格光栅温度传感器（19，20）。 也有换能器（1）与其他汽缸装置（7A，7B）和（1）中指定的多个换能器的波分复用配置。