It is sometimes necessary to monitor and control the thicknees of a film during the process of vacuum evaporation. This paper describes a quartz oscillator for this purpose. It is based on the frequency variation caused by the change in thickness of crystal surface. The calibrations for frequency variation per unit thicknees have been performed using six elements of Pb
Bi
Cu
Au
Al
and Ag.
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references
A. H. F. Muggleton and F. A. Howe , Nucl. Instr. Meth. , 28 , 242 ( 1964 ).
K. H. Behrndt and R. W. Love , Vacuum Science and Technology , 12 , 1 ( 1962 ).