公开(公告)号：EP0098303A4

公开(公告)日：1986-04-02

申请号：EP83901031

申请日：1983-02-14

申请人： UNITED TECHNOLOGIES CORP

发明人： CHENAUSKY PETER P ,  NEWMAN LEON A ,  DRINKWATER ERROLL H

IPC分类号： H01S3/03 ,  H01S3/07 ,  H01S3/081 ,  H01S3/1055 ,  H01S3/23

CPC分类号： H01S3/0315 ,  H01S3/076 ,  H01S3/081 ,  H01S3/1055 ,  H01S3/2383

公开(公告)号：EP0108799A4

公开(公告)日：1984-09-14

申请号：EP83902028

申请日：1983-05-10

申请人： UNITED TECHNOLOGIES CORP

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

IPC分类号： G01N21/49 ,  G01N21/53

CPC分类号： G01N21/85 ,  G01N21/53 ,  G01N2021/151

摘要： 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.