Differential interferometer

Details Differential interferometer Differential interferometer

1991-01-28

1995-01-03

Willis, Davis L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356349, 356358, 356363, G01B 1102

Patent

active

053791150

ABSTRACT:
What is disclosed is an improved high resolution laser interferometer (10) which gains an increase accuracy through elimination of a source of temperature change error by causing a reference laser beam (16) to traverse the same distance within glass as does a measurement laser beam (18). The inventive arrangement of optics combines a polarizing cube (24), a cube corner retroreflector (28), a right angle reflector (30), and two or more quarter wave plates (32), (34) and (36)to produce the desired result. An equally preferred alternate embodiment (210) of the invention combines the first preferred embodiment (10) with an etalon (240) to directly measure the refractive index of air. This measurement is then used to adjust readings obtained using the first preferred embodiment (10) to further improve accuracy.

REFERENCES:
patent: 4802765 (1989-02-01), Young et al.
patent: 4859066 (1989-08-01), Sommargren

Affiliated with

Also associated with

Rating

Differential interferometer does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Differential interferometer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Differential interferometer will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2214957