Optics: measuring and testing – By dispersed light spectroscopy – With synchronized spectrum repetitive scanning
Patent
1987-01-29
1989-02-14
Evans, F. L.
Optics: measuring and testing
By dispersed light spectroscopy
With synchronized spectrum repetitive scanning
356328, 356334, G01J 318, G01J 342
Patent
active
048042668
ABSTRACT:
A system for rapid-scan spectral analysis comprising a concave holographic diffraction grating continuously rotated at a substantially constant angular velocity to provide a rapid scanning monochromator (a monochromator is used to transfer nominal regions of wavelengths out of the continuous light source). The unique sampling circuitry uses an optical shaft encoder. The angular velocity and angular acceleration of the grating are calculated from time measurements, just before the first wavelength of interest falls on the detector. This information is used to control the Analog to Digital converter sampling rate across the region of interest. The samples as a function of time are stored in a memory buffer so that each data point corresponds to a wavelength.
REFERENCES:
patent: 3447873 (1969-06-01), Ashley et al.
patent: 3637310 (1972-01-01), Naono
patent: 4293222 (1981-10-01), Caruso et al.
patent: 4519706 (1985-05-01), Morley et al.
Angus, U V Group Bulletin, No. 8, Part 1, Jun. 1980, pp. 53-60.
Angus, Optical Spectra, vol. 14, No. 8, Aug. 1980, pp. 49-52.
Barspec Ltd.
Deimen James M.
Evans F. L.
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