can be used as the detection head in the UV detector and automatic
free extinguish system.
Typical operating theory of UV light photosensitive diode: The UV light photosensitive diode has 2 symmertically designed
electrode of a pure metal.when photons of sufficient energy range
of 190-260nm stricke the negatively charged
electrode(cathode),electrons will be emitted from it.If at that
moment sufficiently high voltage is present these free electrodes
will be accelerated in the direction of the positive electrode and
in their path of travel through the gaseous atmosphere will ionize
the gas,thus producing a gas discharge.This event causes the tube
to become conductive as long as the voltage during the half period
under consideration is above the quenching voltage for the
discharge. The UV light photosensitive diode will stop firing once the voltage
drops belong that level and fire again(if UV photons are still
present)or the next half period.