Apparatus and method for determining the proportion of a...

Details Apparatus and method for determining the proportion of a... Apparatus and method for determining the proportion of a...

2007-09-11

2007-09-11

Porta, David (Department: 2884)

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

C250S351000

Reexamination Certificate

active

11141112

ABSTRACT:
The invention relates to an apparatus and a method for improved correction of drift in an infrared measuring instrument. The measurement signal furnished by a thermal detector is split into a direct voltage component and an alternating voltage component. By means of calibration curves (24, 27), a calculated comparison variableTDC,korr900is formed from a measured, averaged concentration valuecAC1900.The correction value ΔT for the drift correction is obtained from the difference between the corresponding measured size of the direct voltage componentTDC900and the comparison variableTDC,korr900.

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