Accession Number : ADA112238

Title :   Analysis and Design of a New Phase-Modulated Michelson Interferometer.

Descriptive Note : Technical rept.,

Corporate Author : AEROSPACE CORP EL SEGUNDO CA MATERIALS SCIENCES LAB

Personal Author(s) : Eselun,S A ; Savedra,R C ; Wolff,E G

PDF Url : ADA112238

Report Date : 18 Dec 1981

Pagination or Media Count : 49

Abstract : A new interferometer signal processing system has been designed, analyzed, constructed, and tested. It is based on phase modulation of the interferometer followed electronically by quadrature mixing and frequency-modulated (FM)-type detection. As a result, the system is entirely independent of direct current (dc) or polarization effects, and only one photodetector is required to provide directional information. The output is digital and analog. The range of the unit with two 8-bit counters is presently + or - 64 lambda; however, more counters could be combined to provide a total delta L to the beam coherence length. The unit will detect signals to 30 kHz. Resolution through fringe interpolation is possible to + or - lambda/95 at present, which can be improved with electronic modifications. Phase sensitivity is much greater, with about 3-microvolt signal per angstrom of length change. (Author)

Descriptors :   *Michelson interferometers, *Phase modulation, Signal processing, Prototypes, Frequency modulation, Photodetectors, Polarization, Interpolation, High resolution, Data reduction, Real time, Thermal expansion, Automatic tracking, Piezoelectric transducers

Subject Categories : Test Facilities, Equipment and Methods
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE