公开(公告)号：WO0033048A3

公开(公告)日：2000-11-16

申请号：PCT/US9928812

申请日：1999-12-04

Applicant: CIDRA CORP

Inventor： HAY ARTHUR ,  BAILEY TIMOTHY J ,  MARON ROBERT J ,  FERNALD MARK R ,  PRUETT PHILLIP EDMUND ,  KERSEY ALAN D ,  DAIGLE GUY ,  DIDDEN F KEVIN ,  DAVIS ALLEN R ,  DAVIS MICHAEL A

IPC: G01L11/02 ,  G01L1/24 ,  G01L9/00

CPC classification number: G01L11/025

Abstract: A fiber optic Bragg grating pressure sensor particularly suited for measuring ambient pressure of a fluid includes a pressuring detecting device (12) such as a glass element whose elastic deformation is proportional to applied pressure. An optical fiber (28) with an integral first grating (33) is attached to the device (12) such that elastic deformation of the device (12) generates a corresponding deformation in the grating (33) and thus a corresponding change of the characteristic reflectance wavelength of the grating (33). A second grating (35) may be formed near the pressure detecting device (12) so as to sense ambient temperature but not be affected by deformation of the device (12). The second grating (35) has a second characteristic reflectance wavelength whose variation as a function of temperature is known. As a result, device (12) deformation or changes in the reflection wavelength of the grating (33) due to temperature can be cancelled from the shift in reflection wavelength of the first grating (33) so that the sensed pressure can be determined. Also, the fiber (28) may have more than one grating or be doped at least between a pair of gratings (160, 162), to form a fiber laser or a DFB fiber laser which lasing wavelength changes with changing pressure.

Abstract translation: 特别适用于测量流体环境压力的光纤布拉格光栅压力传感器包括加压检测装置（12），例如玻璃元件，其弹性变形与所施加的压力成比例。 具有集成的第一光栅（33）的光纤（28）附接到装置（12），使得装置（12）的弹性变形在光栅（33）中产生相应的变形，因此特性的相应变化 光栅（33）的反射波长。 可以在压力检测装置（12）附近形成第二光栅（35），以便感测环境温度，但不受设备（12）的变形的影响。 第二光栅（35）具有第二特征反射波长，其变化作为温度的函数是已知的。 结果，可以从第一光栅（33）的反射波长的偏移中抵消装置（12）由于温度而导致的光栅（33）的反射波长的变形或变化，从而可以确定感测的压力。 此外，光纤（28）可以具有多于一个光栅或者至少在一对光栅（160,162）之间被掺杂，以形成激光波长随着变化的压力而变化的光纤激光器或DFB光纤激光器。