Aerial mineral survey method and apparatus using pulsed laser be

Details Aerial mineral survey method and apparatus using pulsed laser be Aerial mineral survey method and apparatus using pulsed laser be

1978-09-07

1981-01-27

Smith, Alfred E.

Radiant energy

Geological testing or irradiation

250459, 356 73, 356301, 356318, G01V 500, G01J 158, G01N 2100, G01J 344

Patent

active

042477700

ABSTRACT:
A high-energy laser (22) carried in an aircraft (10) directs a laser beam (16) downward to a point (18) on the earth's surface beneath the aircraft (10). The intensity of the laser beam (16) is such that the material at the point (18) of contact is vaporized and thereby caused to emit atomic emission spectra characteristic of the material. A spectrometer (28) carried in the aircraft (10) collects the resulting spectra which is analyzed to determine the type and quantity of chemical elements present in the vaporzied sample. The laser beam (16) is directed at the point (18) on the surface with sufficient energy and for a period of time so as to penetrate the surface layer and vaporize the underlying material more representative of the overall mineral composition present in the region of the sample. A second laser beam from laser (29) is directed to the point (18) of contact to generate radiation for Raman and fluorescence spectrometry.

REFERENCES:
patent: 3463591 (1969-08-01), Franken et al.
patent: 3625613 (1971-12-01), Abell
patent: 3899213 (1975-08-01), Fantasia et al.
patent: 4071298 (1978-01-01), Falconer
Karyakin, et al., "Possibility of Using Lasers for the Atomic Absorption Analysis of Geochemical Objects", VDC 621.375.8, translation of Zhurnal Prikladnoi Spektrokupii, vol. 18 (4), pp. 610-613, 4-73, Plenum Pub. Corp., N.Y.
Hirschfeld et al., "New Fields for Laser Raman Spectroscopy", Proc. Electro-Optical Systems Design Conf., N.Y. City, 9-16-79, pp. 418-427.
Margoshes et al., "Emission Spectrometry", Anal. Chem., vol. 40 (5), 4-68, pp. 223-245.

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