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Proceedings Paper

Electro-Mechanical Chopper For Standard Light Pulse Generation
Author(s): Serge Prohoroff
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Paper Abstract

Absolute intensity calibration of the transfer function of a photodetector measuring line is not a straightforward technique. One of the many hints is that it depends on almost all parameters of the experimental set-up. All stable and reliable light standards are continuous working, and thus low level devices. Pulsed sources do exist, but are neither traceable nor calibrated and give badly reproducible pulses. The device which is presented here makes it possible to use standard CW sources, with exposure time down to a few microseconds. The main idea on which the device is based, is to use the multiplication factor of the angular speed of a optical ray reflected by a rotating mirror. Starting at a usual speed wl, a chain of n mirrors gives a final speed 2nw1 . The procedure is well suited to all detectors including photoemulsions, however less accurate in this latter case.

Paper Details

Date Published: 1 March 1983
PDF: 2 pages
Proc. SPIE 0348, 15th Intl Congress on High Speed Photography and Photonics, (1 March 1983); doi: 10.1117/12.967724
Show Author Affiliations
Serge Prohoroff, Universite Libre de Bruxelles (Belgium)

Published in SPIE Proceedings Vol. 0348:
15th Intl Congress on High Speed Photography and Photonics
Lincoln L. Endelman, Editor(s)

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