Many counters have two photo multiplier tubes connected in a coincidence circuit.
2.
The photo multiplier tube is connected to the scintillator via 96 wavelength-shifting fibers.
3.
Inside the cavern is a cylindrical tank that contains 50, 000 metric tons of ultra-pure water and an array of 11, 242 photo multiplier tubes.
4.
More specifically, TCSPC records times at which individual photons are detected by something like a photo-multiplier tube ( PMT ) or an avalanche photo diode ( APD ) after a single pulse.
5.
The coincidence circuit assures that genuine light pulses, which reach both photo multiplier tubes, are counted, while spurious pulses ( due to line noise, for example ), which would only affect one of the tubes, are ignored.
6.
The original VISARs were built at the National Laboratories and had free-space beams on optical tables with discrete optical components such as beam-splitting pellicles, mirrors, quarter wave delay plates, glass etalons, high voltage photo-multiplier tubes, Argon ion lasers and so on.
मोबाइल