| abstract |
A multi-component nondispersive infrared correlation spectrometer for selectively analyzing for a plurality of gases of interest in a gaseous mixture utilizes a rotating filter wheel containing filter systems corresponding to each gas of interest sought. Each filter system contains an ordered pair of filters to sequentially create filtered reference and analysis paths for each gas of interest between a source of infrared radiation and a detector. Special synchronization and signal analysis systems are provided to produce an output signal for each gas of interest. These systems are coordinated with the rotation of the filter wheel in a manner which allows a plurality of gases of interest to be analyzed with simultaneous output. |