Apparatus wherein diffracted light does not return to the source

Details Apparatus wherein diffracted light does not return to the source Apparatus wherein diffracted light does not return to the source

1992-09-02

1995-06-13

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

250237G, G01C 902

Patent

active

054248299

ABSTRACT:
A lattice interference-type displacement detection device including a scale having a penetration-type diffraction lattice formed on one side thereof, and an optical system positioned adjacent to the diffraction lattice and remote from the scale. The optical system includes a light source which emits a light beam along a light source optical path, a light beam divergence arrangement for branching the light beam into first and second divergence beams along first and second optical paths, respectively, and for causing the first and second divergence beams to be incident at a diffraction point on the diffraction lattice, a light beam mixing arrangement for generating first and second mixing light beams from a first group of diffraction light beams generated at the diffraction point, and an arrangement for converting the first and second mixing light beams into respective electrical signals. The scale also includes a light reflection surface remote from the optical system with respect to the diffraction lattice. The light reflection surface reflects the first group of diffraction light beams generated at the diffraction point to the light beam mixing arrangement along third and fourth optical paths, respectively. The optical system is arranged so that a second group of diffraction light beams generated at the diffraction point are not reflected back along the light source optical path to the light source. The light beam divergence arrangement and light beam mixing arrangement are constructed of a single prism.

REFERENCES:
patent: 4676645 (1987-06-01), Taniguchi et al.
patent: 4930895 (1990-06-01), Nishimura et al.
patent: 4979826 (1990-12-01), Ishizuka
patent: 5000542 (1991-03-01), Nishimura et al.

Affiliated with

Also associated with

Rating

Apparatus wherein diffracted light does not return to the source does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus wherein diffracted light does not return to the source, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus wherein diffracted light does not return to the source will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1314151