Measuring and testing – Sampler – sample handling – etc. – Automatic control
Patent
1990-02-26
1991-11-26
Raevis, Robert
Measuring and testing
Sampler, sample handling, etc.
Automatic control
G01N 100
Patent
active
050673564
ABSTRACT:
A conditional sampling technique for flux measurement involves measuring vertical velocity of the movement of air or gas, collecting samples of the air and its components in an "up" canister when the vertical velocity in the upward direction exceeds a threshold, and collecting samples in a "down" canister when the vertical velocity in the downward direction exceeds a threshold. Sensing intervals for measuring and collecting are repeated for a predetermined sampling time period. The passageways to the canisters are always either fully closed or fully opened. At the end of the sampling time period, the standard deviation of the vertical velocities is calculated, and the concentration of a particular component in the samples collected in the canisters is determined by chemical or other analysis. The flux of that component is determined by multiplying a newly discovered coefficient of proportionality and the standard deviation and the difference in concentrations of the particular component collected in the up and down canisters.
REFERENCES:
patent: 3299700 (1967-01-01), Stout, Jr.
patent: 3866474 (1975-02-01), Hasselmann
patent: 4890488 (1990-01-01), Pincent et al.
Desjardins, R. L., Description and Evaluation of a Sensible Heat Flux Detector, Boundary Layer Meteorology 11, pp. 147-154 (1977).
Hicks, B. B. and McMillan, R. T., A Simulation of the Eddy-Accumulation Method for Measuring Pollutant Fluxes, 23, Journal of Climate and Applied Meteorology, pp. 637-643 (Apr. 1984).
Raevis Robert
University Corporation For Atmospheric Research
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