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Products for Research Inc.OPTIONS |
OptionsPhotomultiplier Socket AssembliesCONTENTS
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- Discontinued -OPTION #34: GATED SOCKET ASSEMBLIES
| Specifications |
| This option is integrated directly into Products for Research Photomultiplier Socket Assemblies, and allows the user to control the on/off state of the PMT via a TTL input. The ability to gate a photomultiplier is critical in applications such as LIDAR, where the light level to be measured is significantly lower than the excitation light level. Gating can prevent saturation of the PMT, while allowing time-critical measurement of the lower light level.
The Option #34 circuits utilize optical isolation to allow switching of high voltage potentials. These circuits allow the user to gate the detector using only a TTL input and the high voltage input to the detector - there is no requirement for an additional biasing voltage input. Option #34 is offered in two versions - the GSA-01 (detector is normally OFF), and the GSA-02 (detector is normally ON). Timing characteristics of these circuits are such that the first transition is faster than the second transition. For example, if the transition time from OFF to ON is more critical, the GSA-01 should be used. This is the appropriate circuit for most applications. Alternatively, if the transition time from ON to OFF is more critical, the GSA-02 should be used.
| Additionally, there are both "pulsed" and "DC" versions of the GSA-01 and GSA-02 circuits. The pulsed version should be selected for applications requiring a pulse width of less than 1 µSec. The DC version allows the detector to be held ON or OFF indefinitely, but requires pulse widths of no shorter than approximately 1 µSec.
In order to assist the Products for Research technical assistance department in making the proper recommendations for your application, the following information is required:
Typical timing characteristics are listed below.
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Marked PHOTOCOOL