G - Physics – 01 – N
Patent
G - Physics
01
N
73/0.5
G01N 21/25 (2006.01) G01N 21/27 (2006.01) G01N 21/35 (2006.01) G01N 21/31 (2006.01)
Patent
CA 2018568
ABSTRACT OF THE DISCLOSURE A non-dispersive infrared gas analyzer especially adapted for measuring the concentrations of HC, CO and CO2 in a vehicle exhaust includes a sample chamber for holding a sample gas, a radiation emitter for directing a beam through the chamber and a detector for indicating the amount of radiation absorbed. A plurality of filters each of which transmit radiation at an absorption band of a gas component to be detected are alternatingly positioned in the radiation path to produce a time-multiplexed signal having concentration information for all gases. A calibration assembly is provided which includes a plurality of calibration cells selectively positionable in the radiation path in order to provide an internal calibration standard for two-point calibration of each gas channel. The cells contain one or more of the gas components to be measured at concentrations and pressures predetermined to compensate for the difference in optical path length between the calibration cells and the sample chamber. A technique is provided for characterizing the calibration cells in situ after a conventional calibration using bottled calibration gas is performed. The time-multiplexed detector output is corrected for gain and offset errors "on-the-fly" without requiring demultiplexing through the use of an analog multiplier circuit. The correction factors are themselves determined without demultiplexing the detector output signal. The unit includes improved packaging in which the sample chamber is an easily cleaned, simple tubular member having opened opposite ends that are closed in use by transparent surfaces of source and receiver modules. The entire functional assembly of the receiver module is attached to an access cover which is readily removable for replacement of failed calibration cells.
Danielson David O.
Johnson Ross E.
Kaste Keith
Tury Edward L.
Borden Ladner Gervais Llp
Danielson David O.
Johnson Ross E.
Kaste Keith
Sensors Inc.
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