Optics: measuring and testing – By dispersed light spectroscopy – With monochromator structure
Patent
1991-11-06
1993-08-03
Evans, F. L.
Optics: measuring and testing
By dispersed light spectroscopy
With monochromator structure
356307, 356328, 356334, G01J 318
Patent
active
052334058
ABSTRACT:
A double pass scanning monochromator for use in an optical spectrum analyzer includes an input optical fiber for emitting an input light beam, a diffraction grating for diffracting the input light beam to produce a spatially dispersed light beam, a slit for passing a selected portion of the dispersed light beam, a motor for rotating the diffraction grating, a shaft angle encoder for sensing grating position, and an output optical fiber. The light that passes through the slit is directed to the diffraction grating and is recombined by the diffraction grating to produce an output light beam. The light beam to be analyzed is incident on the diffraction grating during first and second passes. A polarization rotation device rotates the polarization components of the light beam by 90.degree. between the first and second passes so that the output of the monochromator is independent of the polarization of the input light beam. The output optical fiber is translated by a micropositioning assembly in a plane perpendicular to the output light beam during rotation of the diffraction grating to automatically track the output light beam and to provide optical chopping.
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Spillman et al, Analytical Chemistry, vol. 48, No. 2, Feb. 1976, pp. 303-311.
Broome Barry G.
Knight John D.
Stimple James R.
West Joseph N.
Wildnauer Kenneth R.
Evans F. L.
Hewlett--Packard Company
Milks, III William C.
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