Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1982-09-29
1985-12-24
Evans, F. L.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
250339, 356328, G01J 328
Patent
active
045602751
ABSTRACT:
A portable analysis spectrometer (10) for field mineral identification is coupled to a microprocessor (11) and memory (12) through a bus (13) and A/D converter (14) to display (16) a spectrum of reflected radiation in a band selected by an adjustable band spectrometer (20) and filter (23). A detector array (21) provides output signals at spaced frequencies within the selected spectrometer band which are simultaneously converted to digital form for display. The spectrum displayed is compared with a collection of spectra for known minerals. That collection is stored in memory and selectively displayed with the measured spectrum, or stored in a separate portfolio. In either case, visual comparison is made. Alternatively, the microprocessor may use an algorithm to make the comparisons in search for the best match of the measured spectrum with one of the stored spectra to identify the mineral in the target area.
REFERENCES:
patent: 3100264 (1963-08-01), Jaffee et al.
patent: 3829218 (1974-08-01), Alyanak
patent: 4273442 (1981-06-01), Lubbers
patent: 4365303 (1982-12-01), Hannah et al.
California Institute of Technology
Evans F. L.
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