Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1988-09-02
1989-11-21
Willis, Davis L.
Optics: measuring and testing
By particle light scattering
With photocell detection
350633, G01B 902, G01J 345
Patent
active
048818143
ABSTRACT:
The invention is directed to a scanning Michelson type interferometer assembly which includes a beam splitter assembly for receiving a beam of radiation from a source, a stationary plane mirror for receiving and returning a first subbeam over a fixed optical path from the beam splitter assembly and an adjustable plane mirror for receiving and returning a second subbeam over a variable length optical path from the beam splitter, a system for receiving the combined output beam from the beam splitter assembly for forming a spectrum of the input beam radiation, a path difference generator having a pair of parallel spaced mirrors mounted so that the second subbeam is incident on one mirror and is reflected by both mirrors so as to emerage from this direction of incidence, the beam splitter assembly and the stationary plane mirror and the adjustable plane mirror as well as the optical path difference generator assembly being all mounted on a single, rigid monolithic structural frame to provide stability for the entire assembly, pins for forming a tapered track between the monolithic structural frame and the adjustable mirror, a ball mounted for sliding movement in the track, and a differential screw connected to the ball for driving the ball in the track to thereby adjust the tilt of the adjustable mirror, an E-shaped body portion mounted on the monolithic structural frame, which carries a pair of permanent magnets to provide an inwardly directed magnetic field, a scan motor armature coil assembly being mounted on the path difference generator assembly for movement perpendicular to the magnetic field when current is applied assembly in a direction substantially parallel to the to the coils, thereby to rotate the generator assembly, the beam splitter assembly including a beam splitter plate having a beam splitting coating on one surface, and a ring having an optical surface for receiving the plate, the monolithic structural frame having three spaced pads so that the optical surface if the ring can be flexably retained thereon for sliding radial movement due to thermal differential expansion, and a compensator plate being mounted adjacent the beam splitter plate for compensating for optical distortions of the beam of radiation due to the beam splitter plate.
REFERENCES:
patent: 4621899 (1986-11-01), Hoult et al.
Rapid Scan Phase Modulator for Interferometric Applications by Campbell, Krug et al.; Applied Optics, vol. 20, No. 2, Jan. 15, 1981.
Grimes Edwin T.
Koren Matthew W.
The Perkin-Elmer Corporation
Willis Davis L.
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