Single photoelectron counting法におけるS/Nの改善

概要

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In order to improve a signal-to-noise ratio for a single photoelectron counting system, the discriminator method is usually used.Experimental comparison between this method and a pulse height analyser method was performed with respect to the signal-to-noise ratio. The pulse height analyser (P.H.A.) method was found to have a better signal-to-noise ratio than the discriminator method.When a photomultiplier (P.1VI.) was cooled and the temperature dependence of its dark pulses was deviated from Richardson's law, this effect became remarkable.At room temperature, however, this effect was not found, and.these two methods had similar signal-to-noise ratio.It is supposed that dark pulses of P.M. caused by multi-electron-events as well as pulses originated at the dynodes can be removed by the use of the P.H.A.method.Therefore, for the detection of the very low level light flux where a cooled P.M.have to be used, this system will be preferably utilized.Although this work is carried out with only one EMI 6255 B tube, the measured result does not seem to differ appreciably from those for other photomultipliers.
社団法人日本分光学会の論文