Page 169 - Instrumentation Reference Book 3E

References 153
of 0.1 mm diameter tungsten mounted along the electrode is an extremely good collector of
its axis. The electrodes are mounted in a glass ions.
envelope which has a transparent conducting
coating W on its inner wall to stabilize the surface 10.4 References
potential.
Carpenter, L. G., Vacuum Technology, Hilger, Bristol
Operation The gauge is operated in the same (1970)
manner as a conventional ionization gauge. Elec- Leck, J. H., Total and Partial Pressure Meusurement in
trons from the filament oscillate through the grid Vacuum Systems, Blackie, Glasgow (1989)
volume and form ions there. These ions are Pirani, M. and J. Yarwood. Principles of Vacuum Engin-
eering, Chapman & Hall, London (1961)
pushed by the positive potential of the grid Ward, L. and J. P. Bunn, Introduction to the Theory and
towards the ion-collector, which forms their only Practice of High Vacuum Technology, Butterworth.
means of escape. Thus despite its small area, London (1967)