公开(公告)号：BR8307322A

公开(公告)日：1984-04-17

申请号：BR8307322

申请日：1983-05-10

Applicant: UNITED TECHNOLOGIES CORP

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

IPC: G01N21/49

公开(公告)号：MX154995A

公开(公告)日：1988-01-18

申请号：MX19802583

申请日：1983-07-14

Applicant: UNITED TECHNOLOGIES CORP

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

IPC: H01J47/12

公开(公告)号：IT8322077D0

公开(公告)日：1983-07-14

申请号：IT2207783

申请日：1983-07-14

Applicant: UNITED TECHNOLOGIES CORP

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

IPC: H01S20060101 ,  H01S

公开(公告)号：DE3381053D1

公开(公告)日：1990-02-08

申请号：DE3381053

申请日：1983-05-10

Applicant: UNITED TECHNOLOGIES CORP

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

IPC: G01N21/49 ,  G01N21/53

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.

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.

公开(公告)号：EP0108799A4

公开(公告)日：1984-09-14

申请号：EP83902028

申请日：1983-05-10

Applicant: UNITED TECHNOLOGIES CORP

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

IPC: G01N21/49 ,  G01N21/53

CPC classification number: G01N21/85 ,  G01N21/53 ,  G01N2021/151

Abstract: A sensor employs a laser (12) 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 (18) which, in turn focuses the scattered light on a first photodetector (22). A second photodetector (30) receives directly transmitted light energy. A ratio (64) between the output signals of the two photodetectors is derived and presented to a threshold level detector (70). 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 (16) within the entrained gas flow reaches the first photodetector (22). This is important because it prevents particulate matter on the surfaces of the transparent windows (36 and 50) from affecting the operation of the sensor.