Spectroscopic instrument with offset grating to improve focus

Details Spectroscopic instrument with offset grating to improve focus Spectroscopic instrument with offset grating to improve focus

1998-09-03

2000-02-29

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

With synchronized spectrum repetitive scanning

356328, 356334, G01J 318

Patent

active

06031608&

ABSTRACT:
In a spectroscopic instrument having a spherical grating to disperse incident light into a spectrum, the grating is oscillated on axis to scan the light passing through an exit slit through the spectrum or a portion of the spectrum. The axis of rotation of the grating is shifted to be displaced from tangent to the center of the spherical grating so that the light passing through the exit slit is substantially focused throughout the spectrum scanned by the instrument. The grating is mounted in the holder to shift the center of gravity of the grating and the holder to be on the axis on which the grating is pivoted.

REFERENCES:
patent: H1152 (1993-03-01), Korendyke
patent: 3658424 (1972-04-01), Elliott
patent: 4264205 (1981-04-01), Landa
patent: 4436393 (1984-03-01), Vanderwerf
patent: 5015069 (1991-05-01), Bryan et al.
patent: 5355188 (1994-10-01), Biles et al.
patent: 5748310 (1998-05-01), Fujiyoshi

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