Accession Number : ADD015135

Title :   Embedded Fiber Optic Beam Displacement Sensor.

Descriptive Note : Patent, Filed 31 Oct 88, patented 11 Jun 91,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Crane, Roger M ; Fischer, Eugene C

Report Date : 11 Jun 1991

Pagination or Media Count : 11

Abstract : This document discloses a method and apparatus for the two dimensional measurement of displacements of sample materials using a photodetector grid array and optical fiber embedded in the test specimen. The system consists of a light source which is passed into one end of an optical fiber which has embedded a beam specimen, so that when the beam is placed in motion, the light traverses through the fiber and emerges from the opposite end where its projected image traces a pattern simulating that of the beam. In a preferred embodiment, the collimated exiting light is incident upon a light beam splitter which directs equal portions of the light toward a quadrant photovoltaic cell device and toward a charge couple device (CCD). The CCD is connected to an optoelectronic viewing device for initial calibration, display and monitoring. The photodetector array is connected to a translator/amplifier which increases the photocells' source currents and converts them to equivalent voltages for output to a digital data processing terminal. The processing terminal integrates all simultaneous measurements by vectorial resolution of the voltage related deflections' magnitude and direction.

Descriptors :   AMPLIFIERS, ARRAYS, BEAM SPLITTING, CALIBRATION, CELLS, CHARGE COUPLED DEVICES, CURRENTS, DATA BASES, DATA PROCESSING TERMINALS, DIGITAL SYSTEMS, DISPLACEMENT, ELECTROOPTICS, FIBER OPTICS, GRIDS, IMAGES, LIGHT, LIGHT SOURCES, MEASUREMENT, PHOTODETECTORS, PHOTOELECTRIC CELLS(SEMICONDUCTOR), PHOTOVOLTAIC EFFECT, PROCESSING, QUADRANTS, RESOLUTION, SOURCES, SYNCHRONISM, TRANSLATORS, TWO DIMENSIONAL, VECTOR ANALYSIS, VIEWERS, VOLTAGE

Subject Categories : Infrared Detection and Detectors
      Fiber Optics and Integrated Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE