公开(公告)号：US3692485A

公开(公告)日：1972-09-19

申请号：US3692485D

申请日：1971-07-02

Applicant: BECKMAN INSTRUMENTS INC

Inventor： NETI RADHAKRISHNA M ,  BING COLIN C

IPC: G01N21/76 ,  G01N21/26

CPC classification number: G01N21/766 ,  Y10T436/177692

Abstract: A METHOD OF MEASURING THE NITRIC OXIDE CONCENTRATION IN A GAS STREAM IS DISCLOSED. THE GAS STREAM IS MIXED WITH OZONE AT THE ENTRANCE TO A REACTION CHAMBER SO THAT THE MIXTURE ENTERS THE REACTION CHAMBER AS A POINT SOURCE. THE INTENSITY OF THE LIGHT EMITTED AS A RESULT OF THE CHEMILUMINESCENT REACTION BETWEEN THE OZONE AND THE NITRIC OXIDE AT THE POINT SOURCE IS MEASURED. THE INTENSITY OF THE EMITTED LIGHT A FUNCTION OF THE NITRIC OXIDE CONCENTRATION IN THE GAS STREAM, WHEREBY THE NITRIC OXIDE CONCENTRATION IS MEASURED. APPARATUS FOR MEASURING THE NITRC OXIDE CONCENTRATION IN A GAS STREAM IS ALSO DISCLOSED. THE APPARTUS INCLUDES A WALLED VESSEL HAVING A REACTION CHAMBER AND HAVING TWO INLET PASSAGES AND AN EXHAUST PASSAGE IN THE WALL THEREFORE. THE TWO INLET PASSAGES CONVERGE TOGETHER TO A COMMON INLET OPENING INTO THE CHAMBER. A LIGHT WINDOW IS POSITIONED IN THE WALL OF THE CHAMBER OPPOSITE AND IN CLOSE PROXIMITY TO THE COMMON INLET SO THAT THE LIGHT EMITTED BY A CHEMILUMINESCENT REACTION BETWEEN THE GASES AND THE TWO INLET PASSAGES AT THE COMMON INLET CAN BE MEASURED AS A POINT SOURCE. MEANS ARE ASSOCIALTED WITH THE LIGHT WINDOW FOR MEASURING THE LIGHT EMITTED BY THE CHEMILUMINESCENT REACTION.