Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1996-01-26
1997-08-19
Font, Frank G.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
356346, G01B 902
Patent
active
056593910
ABSTRACT:
Apparatus for producing interferograms on array of light detectors is described in which light from a field of view is gathered by a concave Newtonian mirror, collimated by a Schwarzchild objective and directed along a first optical path having PEM's modulated so as to act like an interferometer between a pair of linear polarizers and a lens for imaging light passing through said polarizers onto the array. Scattergrams are produced on the array by a laser in a second optical path that includes a linear polarizer, a modulated PEM for producing light that is polarization modulated, optical elements for directing the circularly polarized light into the field of view of the Newtonian mirror, a modulator for causing the PEM's in the first optical path to elliptically polarize light and a device for extracting the first linear polarizer in the first optical path from that path. The distance between the apparatus and an area under examination is determined by turning on the laser, sinusoidally modulating the PEM in the second optical path, detecting the light modulated by that PEM so as to produce a first sinusoidal voltage, removing modulation from the PEM's in the first optical path and determining the phase difference of a second sinusoidal voltage produced by one light detector of the array and the first sinusoidal voltage.
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patent: 4884886 (1989-12-01), Salzman et al.
patent: 5208651 (1993-05-01), Buican
Buican, Tudor N., "Real-Time Fourier Transform Spectrometry for Flouresce Imaging and Flow Cytometry", SPIE vol. 1205 Bioimaging and Two-Dimensional Spectroscopy (1990) (no month available).
Biffoni Ulysses John
Font Frank G.
Kim Robert
The United States of America as represented by the Secretary of
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