A Transistorized Displacement Meter Using a D.C. Amplifier

Abstract

The article presents the details of a Transistorized Displacement Measuring Instrument using a d.c. amplifier. Often the zero adjustment of a LVDT transducer involves the adjustment of phase and amplitude controls. Also the zero will be obtained only in one position of the core thus necessitating the adjustment of the core critically to a particular position. However, in the method described hare, the phase changes associated with the transducer have no effect on the measuring system and the transducer can be used from anywhere in its linear range, thus altogether eliminating the critical adjustment of initial zero. The instrument directly indicates the sense of the core movement and the output impedance is low, such that the low impedance recorders (galvanometer type) can be directly used. Experimental setup and the design considerations and the results obtained have been given.