Optics: measuring and testing – For light transmission or absorption – Of fluent material
Patent
1987-09-28
1989-02-07
Buczinski, Stephen C.
Optics: measuring and testing
For light transmission or absorption
Of fluent material
356 38, 356432, 356440, G01N 2100
Patent
active
H00005720
ABSTRACT:
An optical analyzer (10) wherein a sample (19) of particulate matter, and particularly of organic matter, which has been collected on a quartz fiber filter (20) is placed in a combustion tube (11), and light from a light source (14) is passed through the sample (19). The temperature of the sample (19) is raised at a controlled rate and in a controlled atmosphere. The magnitude of the transmission of light through the sample (19) is detected (18) as the temperature is raised. A data processor (23), differentiator (28) and a two pen recorder (24) provide a chart of the optical transmission versus temperature and the rate of change of optical transmission versus temperature signatures (T and D) of the sample (19). These signatures provide information as to physical and chemical processes and a variety of quantitative and qualitative information about the sample (19). Additional information is obtained by repeating the run in different atmospheres and/or different rates of heating with other samples of the same particulate material collected on other filters.
REFERENCES:
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patent: 3881992 (1975-05-01), Ralston
patent: 4123159 (1959-10-01), Hollander et al.
Dod et al. (1979), "Opticothermal Analysis of the Coronaceous Fraction of Aerosol Particles," Atmospheric Aerosol Research Annual Report, 1977-78, LBL-8696, pp. 2-10.
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Gundel et al., "Determination of Black Carbon by Thermal Analysis," Environmental Pollutant Studies, Chapter from the Energy and Environment Division Annual Report, 1980, LBL-11986, pp. 5-26, Feb. 1981.
Gundel et al (1984), "The Relationship Between Optical Attenuation and Black Carbon for Urban, Arctic, and Source Carbonaceous Particles," FY 1983 Annual Report, Environmental Research Program, LBL-17073, pp. 4-8, May 1984.
Gundel et al. (1984), "The Relationship Between Optical Attenuation and Black Carbon Concentration for Ambient and Source Particles," The Science of the Total Environment, 36 (1984), pp. 197-202.
Buczinski Stephen C.
Carnahan L. E.
Clouse, Jr. Clifton E.
Hightower Judson R.
The United States of America as represented by the United States
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