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Digicon
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<p>A digicon detector is a <a href="/facts/Image_resolution/NAL4uFV9">spatially resolved</a> light detector using the <a href="/facts/Photoelectric_effect/gIDcdm5U">photoelectric effect</a> directly. It uses <a href="/facts/Magnetic/eo75vApl">magnetic</a> and <a href="/facts/Electric/hNC8D65W">electric</a> fields operating in a <a href="/facts/Vacuum/BTk3goyV">vacuum</a> to focus the <a href="/facts/Electrons/L0KBo5cW">electrons</a> released from a <a href="/facts/Photocathode/XPcNlAjs">photocathode</a> by incoming light onto a collection of silicon <a href="/facts/Diodes/JyaoyGnk">diodes</a>. It is a photon-counting instrument, so most useful for weak sources. One of digicon's advantages is its very large <a href="/facts/Dynamic_range/zxcuI4Fn">dynamic range</a> and it results from the short response and decay times of silicon diodes. </p>