Patent
Direct reading inductance meter
Richard B. Kolbly
- 15 Apr 1976
Vol. 1, Iss: 4
TL;DR: A direct reading inductance meter is comprised of a crystal oscillator for generating a reference frequency f r and an LC tuned oscillator to generate an initial frequency f o which, when mixed with the reference, produces a difference equal to zero as discussed by the authors.
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Abstract: A direct reading inductance meter is comprised of a crystal oscillator for generating a reference frequency f r and an LC tuned oscillator for generating an initial frequency f o which, when mixed with the reference, produces a difference equal to zero. Upon connecting an inductor of small unknown value in the LC circuit to change its resonant frequency to f x , a difference frequency (f r -f x ) is produced that is very nearly a linear function of the inductance of the inductor. The difference frequency is measured and displayed on a linear scale in units of inductance.
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Citations
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TL;DR: In this paper, an apparatus for monitoring the inductance of a coil (L1) which is not part of a resonant circuit including a second coil (l2) connected in series with the first mentioned coil, and a resonance circuit which is formed by connection of a capacitor (c5) to the second coil, or optionally (c2) to a third coil(L3) which acts as the primary and secondary coils of a transformer (M), is presented.
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Inductance divider sensor
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TL;DR: In this paper, a sensor inductor is positioned so that its inductance can be varied in response to the proximity of a target object while the inductance of the reference inductor remains constant.
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Circuit for high impedance broad band probe
Alfons A. Tuszyski
- 10 May 1984
TL;DR: A zero capacitance measurement probe was used to make electrical measurements at a broad range of frequencies without having the probe itself affect the measured values in this article, where the probe reduces internal capacitances in the solid state active elements or creates a negative impedance to counteract capacitance external capacitance.
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References
Patent
Physical displacement measuring system utilizing impedance changing the frequency of an oscillatory circuit
Guy Lloyd Fougere,John Loring Rothery,Raymond H Miller +2 more
- 27 Feb 1970
TL;DR: In this article, an analog data transmission system having as the transmitting means an oscillator with a tuned circuit and means to vary the tuning of this circuit by an incremental value by a switching means operating repetitively, the entire system including a receiving means having a frequency discriminator followed by a voltage sensitive readout device which measures the difference between the two alternate frequencies of the oscillator caused by the switching.
12
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