Page 882 - Basic Electrical Engineering

to the flexible diaphragm, which bends, changing the effective distance, d
between the two plates A and B. This will increase the capacitance, C of the
capacitor, which can be measured and used to know the value of the pressure

applied by the liquid or the gas.

Figure 12.5 Measurement of angular displacement by a capacitive transducer.(a) Fixed and
moveable semicircular plates; (b) linear variation of capacitance with angular displacement of the plate

Figure 12.6 Capacitive transducer with a flexible diaphram as one of the plates

Variation of position of the dielectric material between the plates can be

made to create change in capacitance. Linear distance can be measured by