Method for determining the size of airborne water droplets

Details Method for determining the size of airborne water droplets Method for determining the size of airborne water droplets

1995-09-14

1996-10-22

Williams, Hezron E.

Measuring and testing

Gas analysis

Solid content of gas

7317017, 7320414, G01N 3700

Patent

active

055678653

ABSTRACT:
To determine the size of airborne water droplets having a diameter from approximately 1 to 100 .mu.m, if such water droplets move at a velocity of 50 to 150 m/s relative to a measuring probe and strike it,
in the probe body, whose front face toward the flow has a vapor-deposited platinum film, approximately 0.5 .mu.m thick, whose temperature is kept constant at above 100.degree. C. by means of a bridge circuit;
an analog voltage output signal of the bridge circuit is digitized and then further processed, with the aid of an evaluation computer program, among others, and
with the aid of a formula (in accordance with equation (6)) derived from an energy balance for a droplet striking a platinum film, determines the droplet diameter from analyzed identifying variables of a droplet signal and from other known parameters.

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patent: 5261538 (1993-11-01), Evans et al.
patent: 5263369 (1993-11-01), Cutler

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