Accurate Coded Timing-Light Generator

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: Photographic techniques are extremely useful in the study of fast phenomena or transient conditions. In such a study, it is necessary to know precisely the time elapsed during the different phases of the phenomenon. If more than one highspeed camera is used, it is important to correlate the time indications for all cameras, so that simultaneous photographs can be assembled. The easiest way to record time is to mark it on one edge of the film by means of a time-coded light. An accurate coded timing-light generator, giving a precision of a fraction of a millisecond, has been built and is described in this paper. It is capable of coding many cameras simultaneously at distances of many hundreds of feet. The master unit is triggered by a crystal-controlled oscillator. Transistorized multivibrators generate the timing for the length of the different pulses indicating the seconds, the tenths, hundredths and thousandths of seconds. A transistorized switch applies 350 v to a NE 51 H (General Electric) neon bulb. Slave units are used at each camera location; they can work on dry batteries and are fully transistorized. The complete system is composed of the above decimal system, marking one edge of the film, and of a real-time digital master unit connected to the realtime slave units and lamps that mark the opposite edge of the film.
Publication Date: 1965-04-01
DOI: 10.5594/J06044
Link: https://doi.org/10.5594/J06044
Author(s): Roger Boy de la Tour

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Roger Boy de la Tour; Accurate Coded Timing-Light Generator, Journal of the SMPTE ( Volume: 74, Issue: 4, April 1965); SMPTE, 1965. Available at https://doi.org/10.5594/J06044

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Roger Boy de la Tour; Accurate Coded Timing-Light Generator, Journal of the SMPTE ( Volume: 74, Issue: 4, April 1965); SMPTE, 1965. Available at https://doi.org/10.5594/J06044

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Roger Boy de la Tour; Accurate Coded Timing-Light Generator, Journal of the SMPTE ( Volume: 74, Issue: 4, April 1965); SMPTE, 1965. Available at https://doi.org/10.5594/J06044

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<span class="citation">Roger Boy de la Tour; <cite>Accurate Coded Timing-Light Generator</cite>, Journal of the SMPTE ( Volume: 74, Issue: 4, April 1965); SMPTE, 1965. Available at <a href="https://doi.org/10.5594/J06044" target="_blank" rel="noopener">https://doi.org/10.5594/J06044</a></span>

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Roger Boy de la Tour; Accurate Coded Timing-Light Generator, Journal of the SMPTE ( Volume: 74, Issue: 4, April 1965); SMPTE, 1965
doi: 10.5594/J06044
url: https://doi.org/10.5594/J06044

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Roger Boy de la Tour; <cite id="bib-10-5594-j06044">Accurate Coded Timing-Light Generator</cite>, Journal of the SMPTE ( Volume: 74, Issue: 4, April 1965); SMPTE, 1965
<span class="doi">10.5594/J06044</span>
</li>