公开(公告)号：EP1332344A1

公开(公告)日：2003-08-06

申请号：EP01975271.6

申请日：2001-09-20

Applicant: ANDROS INCORPORATED

Inventor： WILLIAMS, Kevin G. ,  KURTZ, Joseph, John

IPC: G01J3/06

CPC classification number: G01J3/18 ,  G01J3/06 ,  G01J3/42 ,  G01J2003/1204 ,  G01N21/3504

Abstract: Very generally, the gas analyzer (10) of the invention includes a source of infrared energy (12), a sample cell (14) for containing an analyte gas mixture positioned in the path of infrared energy, and a monochromator (26) including a movable diffraction grating (34) for producing a beam of infrared energy wherein the constituent wavelengths are spectrally separated. The device also includes a wide band interference filter (42) for transmitting a predetermined wavelength band spanning the characteristic absorption wavelength of each of a plurality of constituent gases in the analyte gas mixture. A detector (16) positioned to receive radiation passing through the filter (42) produces an electrical response related to the infrared energy impinging thereon. The monochromator (26) includes provision (38, 40) for moving the diffraction grating (34) to sequentially cause infrared energy of different wavelengths to impinge upon the detector (16), and for intermittently causing infrared energy directed toward the detector (16) from the source (12) to be blocked by the interference filter (42).