Inductive proximity sensor using coil time constant for...

Details Inductive proximity sensor using coil time constant for... Inductive proximity sensor using coil time constant for...

2007-02-06

2007-02-06

Patidar, Jay M. (Department: 2862)

Electricity: measuring and testing

Magnetic

Displacement

C324S207260, C324S225000, C324S207150

Reexamination Certificate

active

10955070

ABSTRACT:
Systems and methods are disclosed that facilitate determining coil temperature in a proximity sensor, such as an extended range inductive proximity sensor. Voltage measurements can be taken before, and during, damped oscillatory decay of a voltage in a resonant circuit in the proximity sensor to determine a value, γ, associated with an inductive time constant for the resonant circuit. The gamma value comprises information related to both inductance and resistance in the sensor coil, and can be employed to determine coil temperature. Derivation of the gamma value, and thus of coil temperature, can utilize a current pulse of a duration of approximately one RC time constant of the resonant circuit, thus mitigating current consumption by the proximity sensor during temperature assessment.

REFERENCES:
patent: 4378504 (1983-03-01), Yamasaki
patent: 4543527 (1985-09-01), Schuchmann et al.
patent: 5278523 (1994-01-01), Kriz
patent: 5508662 (1996-04-01), Guichard et al.
patent: 6191580 (2001-02-01), Guichard
patent: 6529007 (2003-03-01), Ott et al.

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