| 摘要 |
PROBLEM TO BE SOLVED: To allow a gating circuit to switch the responsivity of a photomultiplier tube between ON and OFF states by modulating the voltage bias of the one or more of its electrodes. SOLUTION: The gating circuit capacitively couples a voltage pulse to the photocathode 304 or other electrode of the photomultiplier tube 302 in response to a low-voltage triggering signal. A voltage divider 312 network and a high-voltage power supply used to statically bias the photomultiplier tube also power the gating circuitry and transmit a gating voltage pulse. The electrode gating pulse characteristics, including rise- and fall-times, voltage swing amplitude and duration, can be modified by adjusting resistor and capacitor values and Zener diode characteristics of the gating circuit and voltage divider network. The circuit can also be used to gate related devices such as microchannel plates and image intensifiers. COPYRIGHT: (C)2006,JPO&NCIPI
|
