Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1978-09-07
1981-04-28
Corbin, John K.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
356334, G01J 312
Patent
active
042642051
ABSTRACT:
An improved optical system is disclosed for rapid, accurate spectral analysis of the reflectivity or transmissivity of samples. A concave holographic diffraction grating oscillated at high speed is utilized to provide a rapid scanning of monochromatic light through a spectrum of wavelengths. The grating is positively driven at very high speed. The rapid scan by the grating enables the reduction of noise error by averaging over a large number of cycles. It also reduces the measurement time and thus prevents sample heating by excessive exposure to light energy. A filter wheel having opaque segments is rotated in the optical path and is synchronous with the grating. The filter wheel is divided into two arcuate segments separated by the opaque segments arranged approximately 180 degrees apart. One arcuate segment of the wheel transmits only first order light. The other arcuate segment transmits only second order light. Separate photodetectors are employed during infrared analysis of samples for detecting first order and second order wavelength transmissions and an electronic decoder apparatus is utilized for switching between detectors.
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Corbin John K.
de los Reyes B. W.
Neotec Corporation
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