Optics: measuring and testing – For light transmission or absorption – Of fluent material
Patent
1984-10-15
1986-02-04
Rosenberger, R. A.
Optics: measuring and testing
For light transmission or absorption
Of fluent material
356440, G01N 2100
Patent
active
045681902
ABSTRACT:
An electrooptical system and technique for direct quantitative measurement of the mass concentration of monodisperse aerosols by means of filling an enclosed chamber with a cloud or a sequence of separate clouds of essentially transparent and spherical, aerosolized particles or droplets of known density and known or selectively controlled particle size. While within the confines of the chamber the cloud, or each of the sequence of clouds, of aerosolized particles is maintained in a homogeneous condition and irradiated with a beam of high-intensity and constant wavelength irradiation selected to possess a wavelength to particle size ratio wherein attenuation of the irradiation will be almost exclusively, if not nearly entirely, attributable to optical scattering. The mass concentration of the cloud, or each of the sequence of clouds, of aerosolized particles is directly and quantitatively measured, or monitored, as a direct function of the measured magnitude, or intensity, of the attenuated beam of irradiation transmitted through the cloud. The results provide a reliably accurate measurement to within a minimal margin of error of .+-.10% or less.
The system and technique provide a relatively quick and inexpensive means and procedure for calibrating the accuracy, or efficiency of various types of aerosol sampling devices and equipment by affording a chamber from which a known volume of the cloud of monodisperse aerosolized particles may be aspirated into the sampling device or equipment while electrooptically measured. The measured results attained by use of the sampling device may then be compared for accuracy purposes with the electrooptically measured results.
REFERENCES:
patent: 3609043 (1971-09-01), Simmons et al.
patent: 3740149 (1973-06-01), Whetten
Trausk et al., "Light Transmission Instrument for Particle Size Analysis of olloidal Dispersion", Power Technology, vol. 27, No. 2 (Nov./Dec. 1980), pp. 215-218.
Dobbins et al., "Particle Size Measurements Based on Use of Mean Scattering Cross Sections", Journal of the Optical Society of America, vol. 56, No. 10 (Oct. 1966), pp. 1351-1354.
Strobel, H. A., Chemical Instrumentation, .COPYRGT.1960, Addison-Wesley Publishing Co., p. 222.
"Turbidimeter", Turbidimetry and Nephelometry, Van Nostrand's Scientific Encyclopedia, pp. 1900-1901.
Carlon Hugh R.
Kimball David V.
Wright Robert J.
Gibson Robert P.
Lane Anthony T.
Rosenberger R. A.
Sachs Michael C.
The United States of America as represented by the Secretary of
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