公开(公告)号：US3563658A

公开(公告)日：1971-02-16

申请号：US3563658D

申请日：1965-10-22

Applicant: PHILIPS CORP

Inventor： DREYFUS MARC GEORGE

IPC: G01J3/427 ,  G01N21/31 ,  G01N33/00 ,  G01J3/42

CPC classification number: G01N33/0027 ,  G01J3/427 ,  G01N21/314

Abstract: IN A SPECTROARDIOMETER PARTICULARLY ADAPTED TO DETERMINE THE OCCURRENCE OF ATMOSPHERIC CONTAMINANTS, MEANS ARE PROVIDED TO PRODUCE SIGNALS THAT ARE PORPORTIONAL TO THE SUM AND DIFFERENCE BETWEEN THE DIFFERENCE OF ATMOSPHERIC AND REFERENCE RADIATION INTENSITY AT TWO CLOSELY SPACED WAVELENGTHS. THE SUM AND DIFFERENCE SIGNALS CAN BE DIRECTLY PRODUCED BY PROPER DESIGN OF THE SPECTRO-

RADIOMETER CHOPPER. WHILE REDUCTION OF THERMAL EFFECTS IS REDUCED BY THIS SYSTEM, STILL FURTHER REDUCTION CAN BE OBTAINED BY EMPLOYING A FILTER HAVING A THERMALLY RESPONSIVE TRANSMITTANCE IN THE SPECTRORADIOMETER.

公开(公告)号：US3515490A

公开(公告)日：1970-06-02

申请号：US3515490D

申请日：1967-04-11

Applicant: PHILIPS CORP

Inventor： DREYFUS MARC GEORGE ,  BLEISTEIN EDWARD

IPC: G01N21/55 ,  G01N21/16

CPC classification number: G01N21/552