Displacement converter
AssigneeHokushin Electric Works, Ltd.
InventorAtsushi Kimura
Life of this patent
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Abstract
A displacement converter useful for pressure gauges and similar instruments, the converter including a displacement detector provided with a variable capacitor responsive to the displacement to be metered and a fixed capacitor insensitive thereto. Also included is an amplitude-controllable oscillator whose AC output is applied to both capacitors, means being coupled to the capacitors to derive therefrom electrical signals which are a function of their capacitance values. These electrical signals are fed to a control circuit to produce a control signal corresponding to the difference therebetween, the control signal being applied to the oscillator to govern the output amplitude thereof in a manner maintaining the control signal at a constant value.
Claims7
A displacement converter useful in pressure gauges and the like, the converter comprising:
- A. a displacement detector having a variable capacitor responsive to the displacement to be metered and a fixed capacitor insensitive thereto;
- B. an amplitude-controllable oscillator whose AC output is applied to both the variable and fixed capacitor;
- C. means coupled to the variable and fixed capacitors to derive therefrom first and second electrical signals which are a function of their respective capacitance values;
- D. a control circuit responsive to the first and second electrical signals to produce a control signal which depends on the difference therebetween;
- and
- E. means to apply said control signal to the oscillator to govern the output amplitude thereof in a manner maintaining the control signal at a constant level.
Dependencies are inferred from the claim text.