Method and apparatus for transient temperature compensation in g

Details Method and apparatus for transient temperature compensation in g Method and apparatus for transient temperature compensation in g

1994-11-01

1996-08-06

Brock, Michael J.

Measuring and testing

Gas analysis

With compensation detail

250343, G01N 2117, G01J 512

Patent

active

055422853

ABSTRACT:
The invention relates to a method and apparatus for temperature compensation in gas analyzer equipment for transient error caused by temperature change. According to the method, a radiation source (1) is used for transmitting electromagnetic radiation through a gas mixture to be analyzed, the intensity of radiation transmitted through the gas mixture being analyzed is detected by means of a thermal detector (4) comprising a radiation detecting sensor element (16) and a reference sensor element (17) for generating an output signal proportional to the concentration of gas being analyzed, the temperature of said thermal detector (4) is measured either directly or indirectly, the measured detector temperature values are recorded as a function of time, and the output signal of the thermal detector (4) is temperature compensated by a correction term dependent on the temperature rate of change (DT) of the thermal detector. According to the invention, the uncorrected output signal V.sub.mass of the thermal detector (4) is temperature compensated by adding a correction term V.sub.comp dependent on the temperature rate of change (DT) of the thermal detector to said output signal.

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patent: 5223716 (1993-06-01), Rossiter
Johnston, "Gas Monitors Employing Infrared LED's", Meas. Science & Technology, Mar.(1992) pp. 191-195, UK.

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