Portable airborne droplet impactor sampler and method

Details Portable airborne droplet impactor sampler and method Portable airborne droplet impactor sampler and method

1979-12-18

1981-05-05

Kreitman, Stephen A.

Measuring and testing

Gas analysis

Solid content of gas

73432PS, G01N 1502

Patent

active

042651077

ABSTRACT:
A droplet impact sampler based upon the stain technique for measuring airborne droplets comprises a magnesium oxide coated, graphite target located within a cylindrical sampler head below a pneumatically operated shutter. The shutter is opened for a predetermined time period to expose the target to the specimen droplets which stain the target upon contact. Droplet size is determined by measuring the stain diameters and compensating for a flattening effect of the droplet that occurs upon impact as a function of several parameters, such as contact angle, water density and surface tension. Rate of deposition is determined by correlating the number of stains counted on the target with the operating speed of the shutter.

REFERENCES:
patent: 3653253 (1972-04-01), Olin
K. R. May; "Measurement of Airborne Droplets by the Magnesium Oxide Method", Journal of Scientific Instruments, vol. 27, pp. 128-130, May 1950.
S. G. Gathman; "Airborne Droplet Sampler For Use in Fogs and Low-Level Stratus", Journal of Applied Meteorology, vol. 14, pp. 1293-1296, Oct. 1975.
L. Cheng; "Stain Method For Measurement of Drop Size", Environmental Science and Technology, ol. 11, No. 2, pp. 192-194, Feb. 1977.
L. Cheng; "Dynamic Spreading of Drops Impacting Onto a Solid Surface", Ind. Eng. Chem., Process Des. Dev., vol. 16, No. 2, pp. 192-197, Apr. 1977.

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