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Measuring apparatus for determining a linear quantity comprising a capacitance transducer having at least one capacitance variable in accordance with changes in the dimensions of the quantity being measured, and a reference capacitor of substantially constant capacitance with respect to these change

Measuring apparatus for determining a linear quantity comprising a capacitance transducer having at least one capacitance variable in accordance with changes in the dimensions of the quantity being measured, and a reference capacitor of substantially constant capacitance with respect to these changes. The transducer and the reference capacitor are connected to two charge amplifiers in two separate arms of a four arm bridge network, the input impedances of the charge amplifiers forming the other two arms. A source is provided for applying an alternating current input signal to the transducer and reference capacitor, and a differential amplifier is provided to receive the output from the charge amplifiers to provide an output related to the value of the linear quantity. The value of the linear quantity may be expressed as the voltage to be applied to the transducer to maintain the variable capacitor at a constant charge.

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