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    Photo-acoustic leak detector with multiple beams
    2.
    发明专利
    Photo-acoustic leak detector with multiple beams 未知

    公开(公告)号：AU6581498A

    公开(公告)日：1998-10-22

    申请号：AU6581498

    申请日：1998-03-25

    Applicant: UNITED TECHNOLOGIES CORP

    Inventor： OLENDER FREDERICK T ,  WOODY BERNARD A ,  NEWMAN LEON A

    IPC: G01H9/00 ,  G01M3/24 ,  G01M3/38

    Abstract: A photo-acoustic leak detection system for detecting a gas leaking from a component includes a beam, having a wavelength, incident on the component and producing an acoustic signal. A second acoustic signal is also produced when an air source dilutes the gas leaking from the component. A signal processor receives sensor signals indicative of both acoustic signals and uses the second sensor signal as a non-leak baseline measurement and provides an output signal indicative of whether a leak exists.

    FORWARD SCATTERING LASER PARTICULATE SENSOR
    7.
    发明专利
    FORWARD SCATTERING LASER PARTICULATE SENSOR 未知

    公开(公告)号：CA1240758A

    公开(公告)日：1988-08-16

    申请号：CA430556

    申请日：1983-06-16

    Applicant: UNITED TECHNOLOGIES CORP

    Inventor： MELTZ GERALD ,  NEWMAN LEON A ,  DUNPHY JAMES R ,  FOSTER MARTIN C

    IPC: G01N21/85

    Abstract: Forward Scattering Laser Particulate Sensor A sensor employs a laser to obtain a collimated light beam for transmission across the gas effluent of a catalytic cracking process. Particulate matter entrained in the gas flow forward scatters light energy to a collecting aperture which, in turn focuses the scattered light on a first photodetector. A second photodetector receives directly transmitted light energy. A ratio between the output signals of the two photodetectors is derived and presented to a threshold level detector. If the magnitude of the scatter exceeds a predetermined level it is concluded that a catalyst load dump has occurred. The optical system is carefully selected to ensure that only light energy scattered from a sample volume within the entrained gas flow reaches the first photodetector. This is important because it prevents particulate matter on the surfaces of the transparent windows from affecting the operating of the sensor.

    Forward scattering laser particulate sensor
    8.
    发明专利
    Forward scattering laser particulate sensor 未知

    公开(公告)号：IT1163786B

    公开(公告)日：1987-04-08

    申请号：IT2207783

    申请日：1983-07-14

    Applicant: UNITED TECHNOLOGIES CORP

    Inventor： MELTZ GERALD ,  DUNPHY JAMES R ,  NEWMAN LEON A ,  FOSTER MARTIN C

    IPC: H01S20060101 ,  H01S

    Abstract: The sensor employs a laser to obtain a collimated light beam for transmission across the gas effluent of a catalytic cracking process. Particulate matter entrained in the gas flow forward scatters light energy to a collecting aperture which, in turn focuses the light scattered on a first photodetector. A second photodetector receives directly transmitted light energy. A ratio between the output signals of the two photodetectors is derived and presented to a threshold level detector. If the magnitude of the scatter exceeds a predetermined level it is concluded that a catalyst load dump has occured. The optical system is selected to ensure that only light energy scattered from a sample volume within the entrained gas flow reaches the first photodetector. This prevents particular matter on the surfaces of the transparent windows from affecting the operating of the sensor.

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