发明名称 |
Method and apparatus for detecting a component gas in a sample |
摘要 |
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. 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.
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申请公布号 |
US5184017(A) |
申请公布日期 |
1993.02.02 |
申请号 |
US19910746939 |
申请日期 |
1991.08.19 |
申请人 |
SENSORS, INC. |
发明人 |
TURY, EDWARD L.;KASTE, KEITH;JOHNSON, ROSS E.;DANIELSON, DAVID O. |
分类号 |
G01N21/27;G01N21/31;G01N21/35 |
主分类号 |
G01N21/27 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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