An apparatus and method for measuring the inductance of a wire-loop (20) without direct reference to any particular time-constant or frequency. Low-frequency noise induced into the wire-loop (20) is canceled within the detector circuit (24a, 24b) and crosstalk between a plurality of adjacent wire-loops (20a, 20b) is nullified using passive transformers (22). New wire-loop configurations (20a, 20b) utilize the permeability-modulated carrier referencing to provide repeatable inductive signatures with less intrusive, and non-intrusive installations.
申请公布号
WO0057198(A1)
申请公布日期
2000.09.28
申请号
WO2000US07746
申请日期
2000.03.22
申请人
INDUCTIVE SIGNATURE TECHNOLOGIES, INC.;HILLIARD, STEVEN, R.;HILLIARD, GEOFFREY, W.