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    DIAGNOSTIC SYSTEM FOR FIBER GRATING SENSORS
    11.
    发明专利
    DIAGNOSTIC SYSTEM FOR FIBER GRATING SENSORS 未知

    公开(公告)号：CA2203537C

    公开(公告)日：2005-07-26

    申请号：CA2203537

    申请日：1994-11-28

    Applicant: UNITED TECHNOLOGIES CORP

    Inventor： FALKOWICH KENNETH P ,  DUNPHY JAMES R

    IPC: G01D5/353 ,  G01H9/00 ,  G01L1/24 ,  G01M11/00 ,  H01J5/16

    Abstract: An optical sensor diagnostic system includes a tunable narrow wavelength-ban d source (9) which provides a variable wavelength light (44) into an optical fiber (32, 52). Reflective sensors (54, 58), such as Bragg gratings, are disposed along the fiber (52) in the path of tile variable light (44). The sensors (54, 58) transmit light (56, 60) having a minimum transmission wavelength which varies due to a perturbation, such as strain, imposed thereon. A tuner control circuit (42 ) drives the tunable light source (9) to cause the source light (44) to scan across a predetermined wavelength range to illuminate each sens or at its minimum transmission wavelength. The power of the transmitted light is converted to an electrical signal by a detector (64 ) and monitored by a signal processor (68) which detects drops in transmitted power level and provides output signals on lines (71) indicative of the perturbation for each sensor. The system may be configured in open loop mode to measure static strains, or closed loop mode to track static strains and measure dynamic strains. Also, the system may be used in a Fabry-Perot configuration to provide a very sensitive strain detection system. Further, the system may be configured in reflection or transmission mode.

    12.
    发明专利
    未知

    公开(公告)号：DK0862729T3

    公开(公告)日：2002-05-13

    申请号：DK96940596

    申请日：1996-11-21

    Applicant: UNITED TECHNOLOGIES CORP

    Inventor： DUNPHY JAMES R ,  RUKUS ROBERT M ,  HA JONG-MIN

    IPC: B29C35/02 ,  B29C70/54 ,  G01B11/16 ,  G01C19/56 ,  G01D5/353 ,  G01H11/06 ,  G01M11/08 ,  G01N11/00 ,  G01N33/44 ,  G01P15/125 ,  G01K11/32 ,  G01L1/24

    Abstract: Resin curing of a composite laminated structure is monitored using an optical fiber 20 having a grating sensor 28 embedded therein. The fiber 20 is surrounded by upper and lower buffer regions 12,14 having a predetermined minimum number of layers 30 (or thickness) with uni-directional reinforcing filaments 32 and resin 34 therebetween. When the filaments 32 are oriented perpendicular to the longitudinal axis of the fiber 20, the buffer regions 12,14 allow the sensor 28 to exhibit maximum sensitivity to detection of the minimum resin viscosity and the gelation point (i.e., the onset of a rapid crosslinking rate) of the resin 34. The buffer regions 12,14 also have a minimum thickness which serve to isolate the sensor 28 from interfering stresses from arbitrarily angled filaments 32 in layers 30 of outer regions 10,16 which surround the buffer regions 12,14.

    14.
    发明专利
    未知

    公开(公告)号：DK0803049T3

    公开(公告)日：1999-06-23

    申请号：DK95903162

    申请日：1994-11-28

    Applicant: UNITED TECHNOLOGIES CORP

    Inventor： DUNPHY JAMES R ,  FALKOWICH KENNETH P

    IPC: G01D5/353 ,  G01H9/00 ,  G01L1/24 ,  G01M11/00 ,  H01J5/16

    Abstract: An optical sensor diagnostic system includes a tunable narrow wavelength-band source 9 which provides a variable wavelength light 44 into an optical fiber 32,52. Reflective sensors 54,58, such as Bragg gratings, are disposed along the fiber 52 in the path of the variable light 44. The sensors 54,58 transmit light 56,60 having a minimum transmission wavelength which varies due to a perturbation, such as strain, imposed thereon. A tuner control circuit 42 drives the tunable light source 9 to cause the source light 44 to scan across a predetermined wavelength range to illuminate each sensor at its minimum transmission wavelength. The power of the transmitted light is converted to an electrical signal by a detector 64 and monitored by a signal processor 68 which detects drops in transmitted power level and provides output signals on lines 71 indicative of the perturbation for each sensor. The system may be configured in open loop mode to measure static strains, or closed loop mode to track static strains and measure dynamic strains. Also, the system may be used in a Fabry-Perot configuration to provide a very sensitive strain detection system. Further, the system may be configured in reflection or transmission mode.

    DIAGNOSTIC SYSTEM FOR FIBER GRATING SENSORS
    15.
    发明专利
    DIAGNOSTIC SYSTEM FOR FIBER GRATING SENSORS 未知

    公开(公告)号：CA2203537A1

    公开(公告)日：1996-06-06

    申请号：CA2203537

    申请日：1994-11-28

    Applicant: UNITED TECHNOLOGIES CORP

    Inventor： FALKOWICH KENNETH P ,  DUNPHY JAMES R

    IPC: G01D5/353 ,  G01H9/00 ,  G01L1/24 ,  G01M11/00 ,  H01J5/16

    Abstract: An optical sensor diagnostic system includes a tunable narrow wavelength-band source (9) which provides a variable wavelength light (44) into an optical fiber (32, 52). Reflective sensors (54, 58), such as Bragg gratings, are disposed along the fiber (52) in the path of the variable light (44). The sensors (54, 58) transmit light (56, 60) having a minimum transmission wavelength which varies due to a perturbation, such as strain, imposed thereon. A tuner control circuit (42) drives the tunable light source (9) to cause the source light (44) to scan across a predetermined wavelength range to illuminate each sensor at its minimum transmission wavelength. The power of the transmitted light is converted to an electrical signal by a detector (64) and monitored by a signal processor (68) which detects drops in transmitted power level and provides output signals on lines (71) indicative of the perturbation for each sensor. The system may be configured in open loop mode to measure static strains, or closed loop mode to track static strains and measure dynamic strains. Also, the system may be used in a Fabry-Perot configuration to provide a very sensitive strain detection system. Further, the system may be configured in reflection or transmission mode.

    20.
    发明专利
    未知

    公开(公告)号：DK0753130T3

    公开(公告)日：2000-04-25

    申请号：DK95913985

    申请日：1995-03-08

    Applicant: UNITED TECHNOLOGIES CORP

    Inventor： MELTZ GERALD ,  VARASI MAURO ,  VANNUCCI ANTONELLO ,  SIGNORAZZI MARIO ,  FERRARO PIETRO ,  IMPARATO SABATO INSERRA ,  VOTO CLAUDIO ,  DUNPHY JAMES R

    IPC: G01L1/24 ,  G01B11/16 ,  G01D21/02 ,  G01K5/72 ,  G01K11/12 ,  G01K11/32 ,  G01M11/08 ,  G01D5/353 ,  G01D5/26 ,  G01D5/34

    Abstract: An embedded optical sensor has a plurality of layers 10-20 and an optical fiber 21 with a fiber grating 28, disposed between the layers 14,16. The layers 10-20 comprise filaments 22 and resin 24 which have different thermal expansion coefficients and the filaments 22 are oriented so as to create unequal transverse residual stresses that act through the geometry of a resin-rich region that surrounds on the grating 28 in the fiber 21. The unequal transverse residual stresses cause birefringence in the grating 28, thereby causing the grating 28 to reflect light 32 having two wavelengths with a predetermined separation, each along a different polarization axis. The wavelength separation and average wavelength between such separation have different sensitivities to temperature and strain, thereby allowing independent temperature and strain measurements using only a single grating. The birefringence is maximized when the filaments 22 of the adjacent layers 10,12 are oriented at 90 degrees with respect to the longitudinal (Z-axis) of the fiber 21.

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