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Terms
  • photon counter A device used to evaluate the luminance of a surface by determining the number of photons emitted from a sample surface area.
  • photon A quantum of electromagnetic energy of a single mode; i.e., a single wavelength, direction and polarization. As a unit of energy, each photon equals hn, h being Planck's constant and n, the frequency of the propagating electromagnetic wave. The...
  • photodetector A device used to sense incident radiation.
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