Accession Number : ADD009909

Title :   Self-Calibrating Interferometer,

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Nussmeier,Thomas A

Report Date : 26 Oct 1982

Pagination or Media Count : 8

Abstract : A self-calibrating interferometer which forms therein a pair of Michelson interferometers with one beam length of each Michelson interferometer being controlled by a common phase shifter. The transfer function measured form the phase shifter to either of a pair of detectors is sinusoidal with a full cycle for each half-wavelength of phase shifter travel. The phase difference between these two sinusoidal detector outputs represents the optical phase difference between a path of known distance and a path of unknown distance. (Author)

Descriptors :   *Patents, *Michelson interferometers, *Distance measuring equipment, *Phase detectors, *Calibration, Laser beams, Phase shift circuits, Transfer functions, Sine waves, Signal to noise ratio, Schematic diagrams, Beam splitting, Retroreflectors, Electrooptics, Alignment

Subject Categories : Test Facilities, Equipment and Methods
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE