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    2.
    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.

    3.
    发明专利
    未知

    公开(公告)号：DE69513281T2

    公开(公告)日：2000-02-17

    申请号：DE69513281

    申请日：1995-03-08

    Applicant: UNITED TECHNOLOGIES CORP ,  FINMECCANICA SPA

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

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

    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.

    5.
    发明专利
    未知

    公开(公告)号：DE69513281D1

    公开(公告)日：1999-12-16

    申请号：DE69513281

    申请日：1995-03-08

    Applicant: UNITED TECHNOLOGIES CORP ,  FINMECCANICA SPA

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

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

    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.

    6.
    发明专利
    未知

    公开(公告)号：IT1262407B

    公开(公告)日：1996-06-19

    申请号：ITRM930597

    申请日：1993-09-06

    Applicant: FINMECCANICA SPA ,  UNITED TECHNOLOGIES CORP

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

    IPC: G01D5/353 ,  G01M

    Abstract: A system based on integrated optical technologies for the measurement and diagnostics of physical parameters on whatever structure, by the use of optical sensors, made by the fiber embedded Bragg grating method and by the use of a planar integrated optics device for the analysis of the optical signal. The sensors may be embedded or bonded to the structure, allowing the measurement of parameters like strain and temperature, in either a static or dynamic regime. The system pertains to the technical field of the diagnostics and measurements of mechanical or thermal parameters and to the application field of ground, water and aerospace transportation and also to the application field of construction.

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