Noncontact optical motion sensing for real-time analysis

Bradley R. Fetzer; Hiromichi Imai

doi:10.1117/12.23885

1 August 1990 Noncontact optical motion sensing for real-time analysis

Bradley R. Fetzer, Hiromichi Imai

Proceedings Volume 1356, Image-Based Motion Measurement; (1990) https://doi.org/10.1117/12.23885
Event: Image-Based Motion Measurement, 1990, La Jolla, CA, United States

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.

Citation Download Citation

Bradley R. Fetzer and Hiromichi Imai "Noncontact optical motion sensing for real-time analysis", Proc. SPIE 1356, Image-Based Motion Measurement, (1 August 1990); https://doi.org/10.1117/12.23885

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