G - Physics – 01 – R
Patent
G - Physics
01
R
324/44
G01R 27/26 (2006.01)
Patent
CA 1281073
Abstract of the Disclosure The ratio C1/C2 between the capacitances of two capacitors is obtained by connecting them into the frequency-determining circuit of an oscillator in at least three different combinations, namely C1 alone, C2 alone and both or neither of C1 and C2; the resultant oscillation frequencies are measured, and a signal representative of changes in C1/C2 derived from the oscillator frequencies, preferably by means of digital circuitry. In one preferred mode C1/C2 is obtained by forming signals proportional to Image and in another preferred mode proportional to Image In still another preferred mode C1/C2 -1 is obtained from the expression T1-T3/T2-T3 and used as the indication of changes in C1/C2. In the foregoing, f1, f2, f3 and f4 are the oscillator frequencies produced respectively by connecting C1 alone, C2 alone, neither C1 nor C2, and both C1 and C2 into the frequency-determining circuit, and T1, T2, T3 and T4 are the periods of oscillations at f1, f2, f3 and f4 respectively.
560915
Borden Ladner Gervais Llp
Moore Products Co.
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