Electro-Mechanical Chopper For Standard Light Pulse Generation

Serge Prohoroff

doi:10.1117/12.967724

1 March 1983 Electro-Mechanical Chopper For Standard Light Pulse Generation

Serge Prohoroff

Proceedings Volume 0348, 15th Intl Congress on High Speed Photography and Photonics; (1983) https://doi.org/10.1117/12.967724
Event: 15th International Congress on High Speed Photography and Photonics, 1982, San Diego, United States

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.

Citation Download Citation

Serge Prohoroff "Electro-Mechanical Chopper For Standard Light Pulse Generation", Proc. SPIE 0348, 15th Intl Congress on High Speed Photography and Photonics, (1 March 1983); https://doi.org/10.1117/12.967724

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KEYWORDS

Mirrors

Calibration

Geometrical optics

High speed photography

Sensors

Distortion

Mechanics

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