公开(公告)号：US3525476A

公开(公告)日：1970-08-25

申请号：US3525476D

申请日：1968-03-27

Applicant: INSTRUMENTATION LABOR INC

Inventor： BOLING ELDON A ,  SMITH STANLEY B JR ,  ZINDLER JERROLD

IPC: B05B7/04 ,  B05B7/30 ,  A61M11/06

CPC classification number: B05B7/30 ,  B05B7/04

公开(公告)号：US3590255A

公开(公告)日：1971-06-29

申请号：US3590255D

申请日：1969-02-28

Applicant: INSTRUMENTATION LABOR INC

Inventor： SMITH STANLEY B JR ,  BURNETT JAMES E

IPC: G01N21/31 ,  G01N21/26

CPC classification number: G01N21/3103

Abstract: An analysis system includes an analysis cell and a radiation source which generates a characteristic radiation. An optical system passes radiation from the source along a first path through the analysis cell for sensing by a sensor and passes radiation from the source along a second path outside of the analysis cell, for sensing by a second sensor. An optical modulator channels the radiation in each path alternately to the sensors so that each sensor alternately produces an output proportional to the radiation from the corresponding source in each path and means responsive to the optical modulator provides an accurately predetermined portion of the output signal from each sensor in each cycle of the optical modulator.

公开(公告)号：US3583844A

公开(公告)日：1971-06-08

申请号：US3583844D

申请日：1969-06-09

Applicant: INSTRUMENTATION LABOR INC

Inventor： SMITH STANLEY B JR

IPC: F23N5/08 ,  G01N21/72

CPC classification number: F23N5/082 ,  F23N2027/36 ,  G01N21/72

Abstract: A sensor responsive to hydroxyl ions is provided to monitor the flame at the burner in an atomic absorption spectroanalysis system. The sensor in the disclosed embodiment includes an S4 photodiode and a filter to provide a sensitivity over the wavelength band of 3000-3900 A. The output of the photodiode is applied via an FET amplifier stage and an emitter follower stage to burner control circuitry. The burner control circuitry initiates flame via a pilot line, and if hydroxyl ions are not sensed within a predetermined time, the system is automatically shut down. After flame is established, an interlock permits switching from air to nitrous oxide and on failure to sense hydroxyl ions, the nitrous oxide, the fuel and then the air are turned off in sequence in response to the output of the sensor.