Distance measuring device - uses only one oscillator for comparison method of measuring and reference frequencies

Abstract

Abstract The distance measuring device has a measuring resonant circuit whose reasonant frequency depends on the measured distance, a frequency generator controlled by the resonant circuit, a second frequency generator producing a reference frequency, and a comparator for the measured and reference signals. The two frequency generators are formed by a single oscillator (5) which is connected alternately to the measuring resonant circuit (1/6) and to a reference resonant circuit (2/6) with constant resonant frequency. Pref. the two resonant circuits are LC-circuits and have a common capacitor (6) connected to one control input (4) of the oscillator, and separate coils (1, 2) connected by a common changeover switch (3) to the capacitor.

Inventors

• 👤 Hans Dr Ing Held
• 👤 Willi Svoboda

Bibliographic Details