Correction of two beam photometer for fluid analysis
AssigneeHartmann & Braun Aktiengesellschaft
InventorsReimar Faulhaber, Kurt Moldenhauer
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Abstract
A two infrared beam gas analyzer, with sample and reference paths and radiation chopper has two absorption cells as detectors wherein the pressures are compared in a first diaphragm capacitor and the sum with parameter modification by operation of pneumatic inpedances is formed in a second diaphragm capacitor. The ratio of the two capacitor outputs constitutes the output of the system. A compact unitary construction is described in detail including the detector chambers and one capacitor in a body serving as mounting element for the second capacitor with a frit like element interposed as pneumatic inpedances and rotational adjustment of that second capacitor as a whole results in parameter adjustment.
Claims8
In a two beam infrared gas analyzer having a first and a second beam of radiation, the first beam traversing sample fluid in a chamber, the second beam traversing a reference fluid in a chamber, a first and second detector respectively for the first and second beams, and first means connected to the first and second detectors to derive therefrom a first signal representing the difference in detected intensities of the beams, the improvement comprising:
- second means connected to the first and second detectors to derive therefrom a second signal which is the sum of the products, respectively, of two parameters .alpha. and .beta. and of the detected intensities;
- and
- third means connected to the first and second means for forming the ratios of the first and second signals, said ratio representing directly the relation A/( .alpha. + .beta. (1 - A), wherein A is the absorption of radiation in the first chamber due to presence of a particular component to be quantitatively detected in said sample fluid.
Dependencies are inferred from the claim text.