Spectroscope with vignetting reduction

Details Spectroscope with vignetting reduction Spectroscope with vignetting reduction

2007-08-28

2008-10-21

Evans, F. L (Department: 2877)

Optics: measuring and testing

By dispersed light spectroscopy

C356S326000, C250S339070, C359S350000

Reexamination Certificate

active

07440095

ABSTRACT:
In a spectrometer, preferably in a spectrometric microscope, input light is provided from a light source to a specimen via a source objective element (e.g., a Schwarzchild objective), and the aperture of the light source is matched to the aperture of the source objective element to maximize light throughput to the specimen. The light from the specimen is then collected at a collector objective element and delivered to a camera element, which in turn provides the light to a photosensitive detector. The apertures of the camera element and the collector objective element are also matched to maximize light throughput from the specimen to the detector. As a result, light loss from vignetting effects is reduced, improving the intensity and uniformity of illumination and the sensitivity and accuracy of spectral measurements.

REFERENCES:
patent: 5581085 (1996-12-01), Reffner et al.
patent: 2002/0033452 (2002-03-01), Hoult et al.
patent: 2002/0034000 (2002-03-01), Hoult et al.
patent: 2005/0178968 (2005-08-01), Nesnidal et al.
patent: 2006/0202124 (2006-09-01), Hoult et al.

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