Proximity sensor combining impedance, frequency and decay...

Details Proximity sensor combining impedance, frequency and decay... Proximity sensor combining impedance, frequency and decay...

2007-02-06

2007-02-06

Patidar, Jay M. (Department: 2862)

Electricity: measuring and testing

Magnetic

Displacement

C324S225000, C324S207260, C324S207150

Reexamination Certificate

active

10952312

ABSTRACT:
Systems and methods are disclosed that compensate for temperature drift in a proximity sensor, such as an extended range inductive proximity sensor. Voltage measurement 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. A target-induced inductance value can be isolated, via manipulation of the gamma value, and compared to a predetermined threshold value to determine whether the target has been sensed by the proximity sensor.

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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