Photomultiplier tube for measuring hot steel strip thickness

摘要

A photomultiplier includes a photocathode (1), anode (2) and intermediate dynodes (3a-3i). Between cathode (1) and first dynode (3a), is a variable voltage generator (4). Between dynodes (3a, 3b) is another variable voltage generator (6). The dynode voltages can be adjusted to optimise the photomultiplier performance to produce high count rates, for the specific radiation source used.