Optics: measuring and testing – By dispersed light spectroscopy – With monochromator structure
Reexamination Certificate
2006-01-13
2008-03-18
Evans, F. L. (Department: 2877)
Optics: measuring and testing
By dispersed light spectroscopy
With monochromator structure
C356S305000, C356S328000
Reexamination Certificate
active
07345760
ABSTRACT:
A monochromator for use in a spectrograph admits light from an aperture to a primary reflector (preferably an off-axis parabolic mirror) which collimates the input light with low aberration and directs it to a diffraction grating. The component wavelengths of the input light are then directed to first and second secondary reflectors (preferably spherical or toroidal mirrors), which are chosen to cooperatively focus the component wavelengths in ordered bands across an array detector while each at least substantially cancels the effects of any aberrations introduced by the other. By choosing optical elements which supply the grating with input light with low aberration, and then choosing optical elements which receive the component wavelengths from the grating and which offset any aberrations introduced by the other receiving optical elements, wavelength resolution at the detector can be enhanced.
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Evans F. L.
Katz Charles B.
Thermo Electron Scientific Instruments LLC
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