Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1981-09-30
1984-05-08
Kreitman, Stephen A.
Measuring and testing
Gas analysis
Moisture content or vapor pressure
G01N 2706
Patent
active
044467214
ABSTRACT:
This system is a combination of two techniques which are used together effectively combining their features. One technique is an absolute measurement based on mass accumulation rate and used primarily for calibration purposes. The mass accumulation rate on a filter, when divided by the flow rate of the medium through this apparatus, yields the droplet density. The second technique is a differential measurement with two adjacent sampling inlets, one is unrestricted while the other is inertially filtered to eliminate water droplets. The two flow streams in the differential system are cyclically sampled and the combined flow passes a heated wire grid designed to evaporate droplets encountered. The resulting oscillating signal (with DC component) is fed into a lock-in amplifier whose output is the rms value of the difference signal. The vapor component is thereby nearly eliminated and the signal is processed by the phase-locked signal-to-reference detection technique which produces very high sensitivity.
REFERENCES:
patent: 2702471 (1955-02-01), Vonnegut
Article, Applied Optics, vol. 19, No. 19, Oct. 1, 1980, "Experimentally Drmined Relationship Between Extinction Coefficients and Liquid Water Content", by C. W. Bruce et al.
Brewer Ralph J.
Bruce Charles W.
Gibson Robert P.
Kreitman Stephen A.
Murray Jeremiah G.
Redman John W.
The United States of America as represented by the Secretary of
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