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Proceedings Paper

Noncontact optical motion sensing for real-time analysis
Author(s): Bradley R. Fetzer; Hiromichi Imai
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Paper Abstract

The adaptation of an image dissector tube (IDT) within the OPTFOLLOW system provides high resolution displacement measurement of a light discontinuity. Due to the high speed response of the IDT and the advanced servo loop circuitry, the system is capable of real time analysis of the object under test. The image of the discontinuity may be contoured by direct or reflected light and ranges spectrally within the field of visible light. The image is monitored to 500 kHz through a lens configuration which transposes the optical image upon the photocathode of the IDT. The photoelectric effect accelerates the resultant electrons through a photomultiplier and an enhanced current is emitted from the anode. A servo loop controls the electron beam, continually centering it within the IDT using magnetic focusing of deflection coils. The output analog voltage from the servo amplifier is thereby proportional to the displacement of the target. The system is controlled by a microprocessor with a 32kbyte memory and provides a digital display as well as instructional readout on a color monitor allowing for offset image tracking and automatic system calibration.

Paper Details

Date Published: 1 August 1990
PDF: 5 pages
Proc. SPIE 1356, Image-Based Motion Measurement, (1 August 1990); doi: 10.1117/12.23885
Show Author Affiliations
Bradley R. Fetzer, Yaman Ltd. (United States)
Hiromichi Imai, Yaman Ltd. (United States)

Published in SPIE Proceedings Vol. 1356:
Image-Based Motion Measurement
James S. Walton, Editor(s)

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