Photoelectron device with adjustable sensitivity, the ability to cuts photocathode thermionic current

摘要

1. Photoelectric device comprising sequentially located on a photocathode axis braking grid electrode at a negative relative to the photocathode potential multiplying systems and electron collector connected to the power source, characterized in that the space between the grid electrode and retarding system of multiplying a distance by retarding grid electrode, equal to the distance between the photocathode and the retarding grid electrode, placed additional grid electrode located on potential equal to the potential of the photocathode and having a cell size of at least 5 times smaller than the distance to the retarding grid electrode, the potential at the retarding grid electrode selected respective absolute values ​​of maximum initial energy (in electron volts) of thermoelectrons emitted from the photocathode at the operating temperature. ! 2. The photoelectron device according to claim 1, characterized in that the space between the photocathode and the retarding grid electrode placed accelerates electrons leaving the photocathode mesh electrode disposed on the retarding grid electrode at a distance of at least 5 times greater than its pitch equal to the cell and the distance between the retarding grid electrode and the additional grid electrode located at a potential additional grid electrode.