Photon counting methods and devices with electrical pulse...

Details Photon counting methods and devices with electrical pulse... Photon counting methods and devices with electrical pulse...

2006-01-26

2008-03-04

Le, Que Tan (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S207000, C324S754120

Reexamination Certificate

active

07339153

ABSTRACT:
Photon counting electronics and method that allow for counting single photons with sensitivity, linearity, and accuracy. The method for accurately counting photon numbers entering a photon multiplier tube comprising the steps of counting the number of the electrical pulses generated by photons; measuring the duration of the electrical pulses with a timing clock, wherein the timing clock can count the number of temporally overlapped photons; measuring the intensity of the electrical pulses with an intensity discriminator, wherein the intensity discriminator can count the number of intensity-overlapped photons; and summing the number of the electrical pulses, the number of temporally overlapped photon, and the number of intensity-overlapped photons, that is equal to the total number of photons.

REFERENCES:
patent: 5401951 (1995-03-01), Butler
patent: 6342701 (2002-01-01), Kash
patent: 6596980 (2003-07-01), Rusu
patent: 6654119 (2003-11-01), Gould et al.
patent: 6760105 (2004-07-01), Oshida et al.
patent: 6992761 (2006-01-01), Modlin et al.

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