Rotary detector having an optical system for guiding two diffrac

Details Rotary detector having an optical system for guiding two diffrac Rotary detector having an optical system for guiding two diffrac

1995-02-22

1996-07-02

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356351, 250237G, G01B 902

Patent

active

055328199

ABSTRACT:
A rotary detector has a diffraction grating arranged circumferentially and a center at substantially the center of rotation. The rotary detector measures rotational information of a rotating object. The rotary detector is provided with a light source, an irradiating optical system for irradiating luminous flux from the light source to a first point on the diffraction grating, and an optical system for guiding two diffracted luminous fluxes emerging from the first point at an emerging angle and diffracted to have a same order but different signs to be incident at a second point on the diffraction grating at an incident angle relative to a rotational direction of the grating, with the second point positioned substantially opposite to the first point on the diffraction grating with respect to the center of the rotation, and the incident angle is the same angle as the emerging angle. A wave superposing optical system superposes two rediffracted lights diffracted at the second point with the order of the same signs at the first point, respectively, and a detector detects the superposed rediffracted lights. The rotational information of the rotating object is thus measured by the detector.

REFERENCES:
patent: 4772119 (1988-09-01), Bouwhuis et al.
patent: 4829342 (1989-05-01), Nishimura
patent: 4868385 (1989-09-01), Nishimura
patent: 4930895 (1990-06-01), Nishimura et al.
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patent: 5026985 (1991-06-01), Ishizuka et al.
patent: 5051579 (1991-09-01), Tsukiji et al.
patent: 5146085 (1992-09-01), Ishizuka et al.

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