Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1983-10-25
1986-05-27
Yasich, Daniel M.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
356432, 374 45, G01J 508, G01N 2163
Patent
active
045917183
ABSTRACT:
Successive minute regions (13) along a scan path on a coal sample (11) are individually analyzed, at a series of different depths if desired, to determine chemical composition including the locations, sizes and distributions of different maceral inclusions (12). A sequence of infrared light pulses (17) of progressively changing wavelengths is directed into each minute region (13) and a probe light beam (22) is directed along the sample surface (21) adjacent the region (13). Infrared wavelengths at which strong absorption occurs in the region (13) are identified by detecting the resulting deflections (.phi.) of the probe beam (22) caused by thermally induced index of refraction changes in the air or other medium (19) adjacent the region (13). The detected peak absorption wavelengths are correlated with known characteristic peak absorption wavelengths of specific coal constituents to identify the composition of each such minute region (13) of the sample (11). The method enables rapid, convenient and non-destructive analyses of coal specimens to facilitate mining, processing and utilization of coals.
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"A Sensitive Photothermal Deflection Technique for Measuring Absorption in Optically Thin Media", by A. C. Boccara et al.; Apr. 1980, Lawrence Berkeley Lab., (LBL-10793 Reprint), (Calif.), pp. 1-11.
"Sensitive In Situ Trace Gas Detection by Photothermal Deflection Spectroscopy", by D. Fournier et al., Mar. 1980, Lawrence Berkeley Lab., (LBL-10695 Reprint), (Calif.), 374-5.
Carnahan L. E.
Gaither Roger S.
Hightower Judson R.
The United States of America as represented by the United States
Yasich Daniel M.
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