公开(公告)号：EP1247080A2

公开(公告)日：2002-10-09

申请号：EP00993185.8

申请日：2000-11-20

申请人： CiDra Corporation

发明人： DAVIS, Michael, A. ,  FOURNIER, David, R. ,  JONES, Richard, T.

IPC分类号： G01K1/20 ,  G01K11/32

CPC分类号： G01K1/20 ,  G01K11/32

摘要： A fiber Bragg grating reference module provides a precise temperature reference for a temperature probe, including a thermistor, located in close proximity thereto, and includes an optical fiber having a fiber Bragg grating therein, a glass element and a reference housing. The fiber Bragg grating has two ends and with a coefficient of thermal expansion. The glass element anchors the two ends of the fiber Bragg grating, and has a substantially similar coefficient of thermal expansion as the coefficient of thermal expansion of the fiber Bragg grating to ensure that the glass element does not substantially induce strain on the fiber Bragg grating as the ambient temperature changes. The reference housing has a cavity and also has a means for receiving and affixing one end of the fiber Bragg grating and for suspending the fiber Bragg grating in the cavity leaving the other end of the fiber Bragg grating free to move as the ambient temperature changes without inducing strain in the fiber Bragg grating. The glass element includes a glass tube collapsed over the entire length of the fiber Bragg grating.

公开(公告)号：EP1137919A1

公开(公告)日：2001-10-04

申请号：EP99961938.0

申请日：1999-12-04

申请人： CiDra Corporation

发明人： FERNALD, Mark, R. ,  BAILEY, Timothy, J. ,  MILLER, Matthew, B. ,  SULLIVAN, James, M. ,  DUNPHY, James, R. ,  WRIGHT, Christopher, J. ,  KERSEY, Alan, D. ,  PUTNAM, Martin, A. ,  JONES, Richard, T. ,  MARON, Robert, J. ,  DAIGLE, Guy, A. ,  GRUNBECK, John, J.

IPC分类号： G01L9/00 ,  G01L11/02 ,  G01L1/24 ,  G01L19/04

CPC分类号： G01L1/242 ,  G01L11/025

摘要： A fused tension-based fiber grating pressure sensor (8) includes an optical fiber (10) having a Bragg grating (12) impressed therein. The fiber (10) is fused to tubes (20) on opposite sides of the grating (12) and an outer tube (30) is fused to the tubes (20) to form a chamber (34). The tubes (20, 30) and fiber (10) may be made of glass. Light (14) is incident on the grating (12) and light (16) is reflected from the grating (12) at a reflection wavelength (μ1). The grating (12) is placed in tension pre-strain and as the pressure (P) increases, the tension on the grating (12) is reduced and the reflection wavelength shifts accordingly. A temperature grating (50) may be used to measure temperature and allow for a temperature-corrected pressure measurement. The shape of the outer tube (20) may have geometries other than a straight cylinder. Also, the axial ends of tubes (20) where the fiber (10) exits the tubes (20) may have an inner region (22) and/or a protruding tapered (or fluted) axial section (27), to provide strain relief or improved pull strength of the fiber (10). More than one grating or pair of gratings may be used and more than one fiber (10) may be used. The fiber (10) may be doped at least between a pair of gratings (150, 152) to form a tunable fiber laser or the grating (12) or gratings (150, 152) may be constructed as a tunable DFB fiber laser.

公开(公告)号：EP1051629A1

公开(公告)日：2000-11-15

申请号：EP99905545.2

申请日：1999-01-29

申请人： CiDra Corporation

发明人： JONES, Richard, T. ,  MARON, Robert, J. ,  DAIGLE, Guy, A.

IPC分类号： G01P15/08 ,  G01P15/00

CPC分类号： G01P15/18 ,  G01P15/093

摘要： An accelerometer has a main body in combination with one or more Bragg grating sensors respectively arranged along one or more axes. The main body has a mass that responds to an acceleration in one or more axes. The compression or stretching of a Bragg grating sensor causes a wavelength shift in the optical signal that contains information about the acceleration and that is sensed by a detector.