Electronic Image Intensification: Image Intensifier Using Cathodo-Conductivity

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: Recent work on an electron microscope image intensifier has established that thin films of amorphous selenium can give charge multiplication in the region of 2000 when bombarded with high energy electrons. A sealed-off tube achieving prescanning amplification in a similar selenium film is described. In the “writing” function, electrons from a semitransparent photoemissive cathode are focused and accelerated into a 10-μ self-supporting selenium film. The provision of an electron transparent signal plate on the front surface of the film enables charges to be driven to the rear whence they are removed by a low-voltage scanning beam which returns the surface to reading gun cathode potential. Electrostatic scanning is used in combination with retarding field electrodes to achieve orthogonality. Overall sensitivity is dependent on both photo-cathode efficiency and charge multiplication in the selenium—which is itself a function of the writing electron voltage. It can be shown theoretically that the use of a suitably restricted bandwidth and optimized amplifier conditions should enable single photoelectrons to be detected. Tests on experimental tubes have shown that prescanning gains of 500 should be practicable. In this case the tube should be capable of detecting 40 incident photons per cathode image point per frame.
Publication Date: 1961-07-01
DOI: 10.5594/J14351
Link: https://doi.org/10.5594/J14351
Author(s): R. A. Chippendale, J. R. Folkes

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R. A. Chippendale and J. R. Folkes; Electronic Image Intensification: Image Intensifier Using Cathodo-Conductivity, Journal of the SMPTE ( Volume: 70, Issue: 7, July 1961); SMPTE, 1961. Available at https://doi.org/10.5594/J14351

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R. A. Chippendale and J. R. Folkes; Electronic Image Intensification: Image Intensifier Using Cathodo-Conductivity, Journal of the SMPTE ( Volume: 70, Issue: 7, July 1961); SMPTE, 1961. Available at https://doi.org/10.5594/J14351

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<span class="citation">R. A. Chippendale and J. R. Folkes; <cite>Electronic Image Intensification: Image Intensifier Using Cathodo-Conductivity</cite>, Journal of the SMPTE ( Volume: 70, Issue: 7, July 1961); SMPTE, 1961. Available at <a href="https://doi.org/10.5594/J14351" target="_blank" rel="noopener">https://doi.org/10.5594/J14351</a></span>

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<li>
R. A. Chippendale and J. R. Folkes; <cite id="bib-10-5594-j14351">Electronic Image Intensification: Image Intensifier Using Cathodo-Conductivity</cite>, Journal of the SMPTE ( Volume: 70, Issue: 7, July 1961); SMPTE, 1961
<span class="doi">10.5594/J14351</span>
</li>