Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1983-02-09
1985-07-16
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324225, 324232, G01N 2790, G01R 3312
Patent
active
045299366
ABSTRACT:
Supply circuit for an eddy current probe with two windings, comprising two parallel supply channels connected to the probe by a cable, each channel incorporating a reference winding and an amplification circuit having an input and an output, one of the ends of the reference winding being connected to the output of the amplification circuit and the other to the input of said circuit via a negative feedback resistor, wherein the amplification circuit of each channel comprises a first amplifier having an input constituting an input of the amplification circuit and an output connected to an absolute measurement access, a first resistor, whereof one end is connected to the output of the first amplifier, a second amplifier having an input connected to the other end of the first resistor and an output constituting the output of the amplification circuit, and a second resistor connected between the output and the input of the second amplifier.
REFERENCES:
patent: 3683681 (1972-08-01), Van Swaay
patent: 3895292 (1975-07-01), Zair et al.
patent: 3995211 (1976-11-01), Yamada et al.
Intercontrole Societe Anonyme
Strecker Gerard R.
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