par Prohoroff, Serge 
Référence Proceedings of SPIE - The International Society for Optical Engineering, 348, page (166-167)
Publication Publié, 1983-03
Référence Proceedings of SPIE - The International Society for Optical Engineering, 348, page (166-167)
Publication Publié, 1983-03
Article révisé par les pairs
| Résumé : | 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. © 1983 SPIE. |
