Photodetector using photomultiplier and gain control method

Details Photodetector using photomultiplier and gain control method Photodetector using photomultiplier and gain control method

2008-01-29

2008-01-29

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S207000, C313S533000, C313S1030CM

Reexamination Certificate

active

07323674

ABSTRACT:
The present invention relates to a photodetector that has a structure capable of realizing a wide range gain adjustment for each of electron multiplier channels respectively assigned to a plurality of light incidence regions of a multi-anode multiplier. The photodetector comprises a multi-anode photomultiplier, and a bleeder circuit unit. The multi-anode multiplier has a dynode unit constituted by N (an integer or no less than 3) dynode plates, and n-th (an integer of no less then 2) dynode plate is constituted by a plurality of control plates respectively corresponding to the multiplier channels. The bleeder circuit unit has a primary section setting each potential of a first to (n−1)-th and (n+1)-th to N-th dynode plates, and a secondary section for individually setting a potential of each control plate at any potential within the range wider than a potential difference between the (n−1)-th and (n+1) dynode plates. By expanding the potential setting range for the control plates rather than the potential difference between the dynode plates adjacent to the n-th dynode plate, the gain of each electron multiplier channel can be controlled by two digits or more.

REFERENCES:
patent: 5077504 (1991-12-01), Helvy
patent: 6472664 (2002-10-01), Kyushima et al.
patent: 6617768 (2003-09-01), Hansen
patent: 6841935 (2005-01-01), Kyushima et al.
patent: 7148461 (2006-12-01), Shimoi et al.
patent: 7-335174 (1995-12-01), None
patent: 03/004982 (2003-01-01), None

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