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Stabilization of Photomultiplier Tube Gain

IP.com Disclosure Number: IPCOM000096111D
Original Publication Date: 1964-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Neff, GW: AUTHOR [+3]

Abstract

For many applications of light detectors, use of a photomultiplier tube is favored because of good gain, bandwidth, and noise characteristics. This arrangement achieves a very stable gain. The method eliminates any need for inserting a standardizing signal. The method also permits continuous regulation without requiring high-frequency light modulation or referencing against a standard source.

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Stabilization of Photomultiplier Tube Gain

For many applications of light detectors, use of a photomultiplier tube is favored because of good gain, bandwidth, and noise characteristics. This arrangement achieves a very stable gain.

The method eliminates any need for inserting a standardizing signal. The method also permits continuous regulation without requiring high-frequency light modulation or referencing against a standard source.

Photomultiplier tube 1 has cathode lead 2 and anode lead 3. Lead 2 connects to comparator 7 via amplifier 4. The output of tube 1, which is on lead 3, is applied as the second input to comparator 7 via a low-pass filter 6.

Comparator 7 serves to compare the amplification of tube 1 with the constant gain of amplifier 4. If a difference exists due to the drifting tube 1, comparator 7 generates an error signal 8. This can be used to change the dynode voltages or other parameters of tube 1 and to serve to adjust its gain to the desired constant value.

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