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.

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.

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.