Oscillators – Phase shift type
Patent
1984-04-18
1986-07-01
LaRoche, Eugene R.
Oscillators
Phase shift type
324222, 324236, 331 65, 331117R, H03B 520
Patent
active
045982600
ABSTRACT:
An inductive sine wave oscillator circuit for an eddy current proximeter. The oscillator circuit includes an operational amplifier and a coil. The frequency and amplitude of the output signal produced by the circuit varies with and is controlled by the inductance of the coil. The circuit signal input to the operational amplifier undergoes a phase shift as the signal passes through the amplifier. One advantage of the oscillator circuit is that the frequency and amplitude of the output signal of the circuit for a coil having a particular inductance remains relatively stable and constant when the operating temperature of the coil varies. In addition, the coil can be fabricated from a material having a relatively high electrical resistivity.
REFERENCES:
patent: 3883796 (1975-05-01), Holt et al.
patent: 4095469 (1978-01-01), Yamada et al.
patent: 4310807 (1982-01-01), McKee
patent: 4414541 (1983-11-01), Ho
LaRoche Eugene R.
Lee James C.
Transducer Limited Partnership
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