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Hamamatsu R2868 is a ultraviolet detector that
makes use of the photoelectric effect of metal and the gas multiplication
effect. It has a narrow spectral sensitivity of 185 to 260 nm, being
completely insensitive to visible light. Unlike semiconductor detectors,
it does not require optical visible-cut filters, thus making it easy to
use. In spite of its small size, the R2868 has wide angular sensitivity
(directivity) and can reliably and quickly detect weak ultraviolet
radiations emitted from flame due to use of the metal plate cathode (eg.
it can detect the flame of a cigarette lighter at a distance of more than
5 m.). The R2868 is well suited for use in flame detectors and fire
alarms, and also in detection of invisible discharge phenomena such as
corona discharge of high-voltage transmission lines.
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Additional Information
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