Optically phase-locked electronic speckle pattern interferometer
Abstract
The design, theory, operation, and characteristics of an optically phase-locked electronic speckle pattern interferometer (OPL-ESPI) are described. The OPL-ESPI system couples an optical phase-locked loop with an ESPI system to generate real-time equal Doppler speckle contours of moving objects from unstable sensor platforms. In addition, the optical phase-locked loop provides the basis for a new ESPI video signal processing technique which incorporates local oscillator phase shifting coupled with video sequential frame subtraction.
- Publication:
-
Applied Optics
- Pub Date:
- February 1987
- DOI:
- 10.1364/AO.26.000475
- Bibcode:
- 1987ApOpt..26..475M
- Keywords:
-
- Phase Locked Systems;
- Speckle Interferometry;
- Speckle Patterns;
- Design Analysis;
- Doppler Effect;
- Electro-Optics;
- Image Processing;
- Instrumentation and Photography;
- INTERFEROMETRY;
- SPECKLE PHENOMENA