Abstract: A load measuring transducer comprises a frame structure machined out of a single piece and constituted by an inflexible fixed member and a movable member interconnected by parallel arms and resiliently articulated. The fixed member carries plates of a reference capacitor and one plate of a capacitative transducer, the other plate being carried by the moving member. The fixed and variable capacitors are connected to a ratio measuring circuit whose output signal denotes the applied load independent of environmental conditions. The reference capacitor and capacitative transducer may form portions of a differential capacitor and the electrodes may be planar or cylindrical.

Abstract: A rotary displacement capacitive transducer for indicating the angular position of a shaft comprises first and second cylindrical electrodes each electrode having inner and outer conducting members connected together by insulative adhesive and a part cylindrical screen mounted to the shaft is disposed between the electrodes and rotated with the shaft to vary the capacitance between the electrodes. The surfaces of the conducting members define the capacitance of the transducer.

Abstract: A circuit arrangement for measuring the ratio of first and second capacitances of a capacitance displacement transducer. An alternating signal is developed the amplitude of which is proportional to the values of the first and second capacitances during respective first and second timing periods, the alternating signal being synchronously demodulated in one phase in the first period and in the opposite phase in the second period. The demodulated signal is integrated so that the integrator is charged and discharged during the first and second periods respectively, and the ratio of the discharge time to the charge time is equal to the ratio of the two capacitances. A digitized output is provided by means of a clock pulse generator and counter.