Optics: measuring and testing – By dispersed light spectroscopy – With monochromator structure
Patent
1994-07-19
1996-06-18
Berman, Jack I.
Optics: measuring and testing
By dispersed light spectroscopy
With monochromator structure
359575, 2505051, 376 84, G01J 318
Patent
active
055283640
ABSTRACT:
This invention is related to a monochromator which employs a spherical mirror, a traveling plane mirror with simultaneous rotation, and a varied spacing plane grating. The divergent beam from the entrance slit is converged by the spherical mirror located at the various positions in the monochromator depending of the inventive system. To provide the meaningful diffraction efficiencies and to reduce unwanted higher order lights, the deviation angle subtending the incidence and diffraction beams for the plane grating is varied with the position of the traveling plane mirror with simultaneous rotation located in the front or back of the plane grating with wavelength scanning. The outgoing beam from the monochromator goes through the fixed exit slit and has same beam direction regardless of the scanning wavelength. The combination of properly designed motions of the plane mirror and novel varied-spacing parameters of the inventive plane grating corrects the aberrations and focuses the monochromatic spectral image on the exit slit, enabling measurements at high spectral resolution.
REFERENCES:
patent: 4886341 (1989-12-01), Oishi et al.
patent: 5047650 (1991-09-01), Harada et al.
patent: 5078495 (1992-01-01), Harada et al.
patent: 5274435 (1993-12-01), Hettrick
Berman Jack I.
Ross Pepi
The Regents University of California
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