title: 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.
authors.forename: S E
authors.initials: SE
authors.lastname: Moran
authors.forename: R L
authors.initials: RL
authors.lastname: Law
authors.forename: P N
authors.initials: PN
authors.lastname: Craig
authors.forename: W M
authors.initials: WM
authors.lastname: Goldberg