Optically Phase-Locked Electronic Speckle Pattern Interferometer (OPL-ESPI).
Abstract
This report describes the design, theory, operation, and characteristics of the OPL-ESPI, which generates real time equal Doppler speckle contours of of vibrating objects from unstable sensor platforms with a Doppler resolution of 30 Hz and a maximum tracking range of + or - 5 HMz. The optical phase locked loop compensates for the deleterious effects of ambient background vibration and provides the bases for a new ESPI video signal processing technique, which produces high contrast speckle contours. The OPL-ESPI system has local oscillator phase modulation capability, offering the potential for detection of vibrations with the amplitudes less than lambda/100. Keywords: Optical phase locked loop: Optical voltage controlled oscillator.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1986
- Accession Number
- ADA178652
Entities
People
- Peter N. Craig
- Robert L. Law
- Steven E. Moran
- Warren M. Goldberg