Radiant energy – Invisible radiant energy responsive electric signalling – Including a radiant energy responsive gas discharge device
Patent
1986-11-03
1989-06-06
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
Including a radiant energy responsive gas discharge device
250382, 250423P, 324464, G01N 2764
Patent
active
048374407
ABSTRACT:
Aerosol particles, resulting from the combustion of organic substances with insufficient oxygen supply, usually contain toxic, higher hydrocarbonic substances (e.g. tar) on their surface. These substances, e.g. tar, has the property to be photoelectrically more active than other substances contained in the atmosphere. In the method and apparatus according to the invention an aerosol, i.e. the carrier gas containing the particles to be characterized, is used which has been brought to at least one predetermined temperature sufficient for evaporation or decomposition or preventing condensation of molecules on particles of said aerosol that quench or enhance photoelectric activity. Such aerosol is exposed to electromagnetic radiation and, thereby, activated to electron emission. Thereafter the charge of the photoelectrically positively charged particles is determined by means of size selective filter means which are connected to current or charge measuring equipment. From the measured values information can be derived about the nature and amount of said molecules and about the remaining surface of the aerosol particles. Additional information on the coatings and also on the species of hydrocarbon may be obtained by observing the measured values as a function of temperature. The method and apparatus are particularly useful for the measurement of air pollution.
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patent: 4463595 (1984-08-01), Yeh et al.
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patent: 4769548 (1988-09-01), Burtscher et al.
Burtscher et al., "Probing Aerosols by Photoelectric Charging", J. Appl. Phys. 53 (5), May 1982, pp. 3787-3791.
Weeks et al., "Interaction of TEA CO.sub.2 Laser Radiation with Aerosol Particles", Appl. Optics, 15 (1), Nov. 1976, pp. 2917-2921.
Burtscher Heinz
Schmidt-Otl Adnreas
Siegmann Hans-Christoph
Fields Carolyn E.
Matter & Siegmann AG
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