Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1980-02-27
1981-01-20
Corbin, John K.
Optics: measuring and testing
By particle light scattering
With photocell detection
250574, 340627, G01N 1506, G01N 2151
Patent
active
042459109
ABSTRACT:
The invention relates to a dust indicator for detecting the presence of suspended particles, either solid or liquid, in a gas. A concentrated, substantially parallel light beam (1) of suitable wavelength is directed through a measuring chamber (2) containing the gas to be examined. The light beam is surrounded by an internally reflecting elliptical cylindrical reflector (4) in a manner such that the beam (1) coincides with one focal axis (B.sub.1) of the reflector. Arranged in the other focal axis (B.sub.2) of the reflector (4) is at least one light detector (6) with its active surface facing the reflector and the center axis of its field of view directed, preferably perpendicularly, towards the first said focal axis (B.sub.1) along which the beam (1) is directed.
REFERENCES:
patent: 3946239 (1976-03-01), Salzman et al.
Cecchi, D. R. et al., "Elliptical Light Collector", IBM Technical Disclosure Bulletin, vol. 13, No. 11, Apr. 1971, p. 3327.
Moenke-Blankenburg et al., "New Aspects of the Apparatus, Technique and the Methods of Laser Micro-Emission Analysis" Spectrochimica Acta, vol. 30B, pp. 227-234.
Arnold Bruce Y.
Corbin John K.
Svenska Utvecklings Aktiebolaget
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