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    TEMPERATURE COMPENSATED OPTICAL PRESSURE SENSOR
    42.
    发明专利
    TEMPERATURE COMPENSATED OPTICAL PRESSURE SENSOR 未知

    公开(公告)号：GB2147412B

    公开(公告)日：1987-06-03

    申请号：GB8422229

    申请日：1984-09-03

    Applicant: UNITED TECHNOLOGIES CORP

    Inventor： MELTZ GERALD ,  ALLEN LOUIS BENTON ,  FERRAR CARL MCALVAY

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

    Abstract: An integrated optical pressure transducer having a diaphragm fabricated from a low-loss glass is positioned at the location where pressure changes are to be measured. An optical waveguide loop formed on one surface of the diaphragm acts as a ring cavity in which the difference between the resonating frequencies varies with pressure but not with temperature. Light energy is coupled into the waveguide loop from an optical source through a tangentially located input waveguide. An output waveguide, also tangentially located, couples light energy from the waveguide loop to a broadband detector so that the changes in frequency spectrum of the resonating frequencies within the waveguide loop can be monitored.

    45.
    发明专利
    未知

    公开(公告)号：FI802733A

    公开(公告)日：1981-03-01

    申请号：FI802733

    申请日：1980-08-29

    Applicant: UNITED TECHNOLOGIES CORP

    Inventor： MELTZ GERALD ,  SNITZER ELIAS

    IPC: G01B11/16 ,  G01L1/24 ,  G01L11/00 ,  G01L11/02 ,  G08C23/00 ,  G01L

    Abstract: An optical fiber having at least two cores positioned in a common cladding can be fabricated to be responsive to strain or hydrostatic pressure but not to temperature through the selection of materials, spacing and shape of the cores and cladding in the fiber. Accordingly, the cross-talk between adjacent cores in the optical waveguide can be optimized to respond to a change in hydrostatic pressure or in unidirectional strain along the length of the fiber. The strain or pressure change, can be determined by measuring the relative intensity of light emerging from the different cores of the fiber. A larger unambiguous range for strain or hydrostatic pressure changes can be provided by a multi-core optical fiber embodiment.

    MICROWAVE AIR-PATH CLEARANCE SENSOR
    46.
    发明专利
    MICROWAVE AIR-PATH CLEARANCE SENSOR 未知

    公开(公告)号：CA2204693C

    公开(公告)日：2007-03-27

    申请号：CA2204693

    申请日：1997-05-07

    Applicant: UNITED TECHNOLOGIES CORP

    Inventor： MELTZ GERALD ,  GRZYBOWSKI RICHARD R

    IPC: G01B15/00 ,  F01D11/02 ,  F01D11/08 ,  F01D11/12 ,  F01D21/04 ,  F02C7/00 ,  G01S13/36 ,  G01S13/88

    Abstract: A machine having protruding elements 26 and an adjacent abradable seal 18, which move relative to each other, an air-path clearance G between the seal 18 and the elements 26 and an element distance D2 between the sensor 10 and the elements 26, is provided with a sensor 10 which is recessed within the seal 18 by a recess distance D. A clearance/ thickness circuit 14 provides transmitted and reflected microwave signals 30,32 along a coaxial cable 12 having a characteristic impedance, to the sensor 10, which has an impedance substantially matched to the characteristic impedance of the cable 12. The sensor 10 provides the reflected signal 32 which is indicative of the recess distance D when the elements 26 are not in front of the sensor 10 and is indicative of the blade distance D2 between the sensor 10 and the elements 26 when the elements 26 are in front of the sensor 10. The circuit 14 receives the reflected signal 32 and provides electrical signals indicative of the recess distance D and/or the air-path clearance G. Alternatively, the circuit 14 may provide only the recess distance D. The sensor 10 provides such measurements whether or not the machine is operating.

    47.
    发明专利
    未知

    公开(公告)号：DE69727169T2

    公开(公告)日：2004-09-02

    申请号：DE69727169

    申请日：1997-05-07

    Applicant: UNITED TECHNOLOGIES CORP

    Inventor： CRZYBOWSKI RICHARD R ,  MELTZ GERALD

    IPC: G01B15/00 ,  F01D11/02 ,  F01D11/08 ,  F01D11/12 ,  F01D21/04 ,  F02C7/00 ,  G01S13/36 ,  G01S13/88 ,  G01S13/08

    Abstract: A machine having protruding elements 26 and an adjacent abradable seal 18, which move relative to each other, an air-path clearance G between the seal 18 and the elements 26 and an element distance D2 between the sensor 10 and the elements 26, is provided with a sensor 10 which is recessed within the seal 18 by a recess distance D. A clearance/thickness circuit 14 provides transmitted and reflected microwave signals 30,32 along a coaxial cable 12 having a characteristic impedance, to the sensor 10, which has an impedance substantially matched to the characteristic impedance of the cable 12. The sensor 10 provides the reflected signal 32 which is indicative of the recess distance D when the elements 26 are not in front of the sensor 10 and is indicative of the blade distance D2 between the sensor 10 and the elements 26 when the elements 26 are in front of the sensor 10. The circuit 14 receives the reflected signal 32 and provides electrical signals indicative of the recess distance D and/or the air-path clearance G. Alternatively, the circuit 14 may provide only the recess distance D. The sensor 10 provides such measurements whether or not the machine is operating.

    48.
    发明专利
    未知

    公开(公告)号：DE69034102D1

    公开(公告)日：2003-10-30

    申请号：DE69034102

    申请日：1990-12-21

    Applicant: UNITED TECHNOLOGIES CORP

    Inventor： MOREY WILLIAM W ,  GLENN WILLIAM H ,  LEONBERGER FREDERICK J ,  MELTZ GERALD

    IPC: G02B26/00 ,  G02B6/34 ,  G02F1/01 ,  G02F1/125 ,  G02B6/16

    Abstract: A variable light filtering arrangement (10) includes at least one optical fiber section (11) including a waveguiding core (13), and at least one permanent Bragg grating region (12) in the optical fiber section. The grating region includes a plurality of grating elements constituted by periodic refractive index variations of a predetermined initial periodicity and cumulatively redirecting, of the light launched into the core for guided propagation therein, that having an axial wavelength within a narrow band around a central wavelength that is determined by the periodicity and refractive index variations of the grating elements. At least one of the periodicity and refractive index variations of the grating region is controlledly modified in such a manner as to temporarily change the central wavelength within a predetermined wavelength range.

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