An Inexpensive Circuit for Pulsing-Off a Side-Window Photomultiplier Tube
Abstract:In many applications, photomultiplier tubes (PMTs) must be operated at high gains in order for one to obtain adequate detection of low-light-level signals. However, when an intense light pulse immediately precedes the low-level light signal, the PMT may be promoted into a state of saturation. Saturation is the nonlinear enhancement of the anode current with respect to the intense photon flux incident upon the photocathode. This is caused by the redistribution of the biasing potential across the dynode chain. The last dynodes are unable to be sustained at a constant potential because of space charge depletion of the dynode surfaces. Further illumination of the photocathode results in a nonlinear increase in photocurrent. Saturation effects may last up to several microseconds, rendering the photomultiplier tube inoperable. In the extreme, intense light pulses may result in permanent damage to the MPT.
Document Type: Short Communication
Affiliations: Department of Chemistry, University of Vermont, Bington, Vermont 05405
Publication date: February 1, 1987
More about this publication?
- The Society publishes the internationally recognized, peer reviewed journal, Applied Spectroscopy, which is available both in print and online. Subscriptions are included with membership or can be purchased by institutional or corporate organizations. Abstracts may be viewed free of charge. Previously published as Bulletin (Society for Applied Spectroscopy)
- Editorial Board
- Information for Authors
- Submit a Paper
- Subscribe to this Title
- Membership Information
- Request copyrighted SAS materials
- Spectroscopic Nomenclature
- Focal Point (Open Access)
- ingentaconnect is not responsible for the content or availability of external websites