Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1974-10-24
1976-12-14
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
313105R, 328243, H01J 3912
Patent
active
039977790
ABSTRACT:
A circuit device for electron multipliers, especially photomultiplier tub in which the amplification is varied by switching the number of active dynodes. Sensitivity ranges from diode-mode up to a multiplier with full number of dynodes. The signal is taken from the last active dynode, and from the cathode in diode-mode. Any switchable dynode is provided with its own load resistor inserted between the relevant dynode and a dynode voltage divider. An amplifier connected to the last active dynode and to the dynode voltage divider provides a feedback that compensates for voltage drops at the next lower dynodes due to the finite impedance of the dynode voltage divider. The circuit device features fast signal risetime, high linearity and wide dynamic signal range together with high DC-current capability and clean transient response. Applications are transient-spectrophotometers where high signal-to-noise ratios are needed, accurate pulse-height-analysis, etc. The device may be constructed as a self-contained unit.
REFERENCES:
patent: 2458539 (1949-01-01), Soller
patent: 3080790 (1963-03-01), Morgan
patent: 3393319 (1968-07-01), Randall et al.
Max-Planck-Gesellschaft zur Forderung der Wissenschaften e.v.
Nelms David C.
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