Vapor concentration monitor

Details Vapor concentration monitor Vapor concentration monitor

1975-05-30

1977-07-05

Bauer, Edward S.

Optics: measuring and testing

Inspection of flaws or impurities

Bore inspection

250343, 356 51, 356189, G01N 2126

Patent

active

040336999

ABSTRACT:
An apparatus for monitoring the concentration of a vapor, such as heavy water, having at least one narrow bandwidth in its absorption spectrum, in a sample gas such as air. The air is drawn into a chamber in which the vapor content is measured by means of its radiation absorption spectrum. High sensitivity is obtained by modulating the wavelength at a relatively high frequency without changing its optical path, while high stability against zero drift is obtained by the low frequency interchange of the sample gas to be monitored and of a reference sample. The variable HDO background due to natural humidity is automatically corrected.

REFERENCES:
patent: 3784307 (1974-01-01), Jackson et al.
patent: 3860818 (1975-01-01), Stalder et al.
patent: 3861809 (1975-01-01), Hall, Jr.
patent: 3932040 (1976-01-01), Warncke
Wood, The Review of Scientific Instruments, vol. 29, No. 1, Jan. 1958, pp. 36-41.

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