Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1988-08-02
1990-05-01
Strecker, Gerald R.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
324690, G01R 2726
Patent
active
049221817
ABSTRACT:
Apparatus for monitoring the dielectric composition of articles, particularly articles such as blisterpacks and laminated boards. The apparatus comprises an amplifying circuit including a capacitor between the electrodes (1, 3) of which an article (22) is moved in use. The gain of the amplifying circuit varies with the capacitance of the capacitor so that the amplifying circuit provides an output signal, the peak value of the output signal varying with the dielectric constant of the article (22) between the capacitor electrodes (1, 3). Typically the amplifying circuit includes an operational amplifier (9) the non-inverting input (10) of which is connected to a ground potential (6) and the inverting input (8) is connected to one electrode (3) of the capacitor. A feedback loop (11) is applied between the output (14) of the operational amplifier (9) and the inverting input (8) of the operational amplifier to force the inverting input to the same potential as the non-inverting input. Typically an oscillating signal source (5) is connected to the other electrode (1) of the capacitor.
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NASA Tech Brief, Dielectric Scanning Locates Voids in Glass Foam, National Aeronautics and Space Administration, Sep., 1984, No. 9.
Harvey Jack B.
Laetus Systems Limited
Strecker Gerald R.
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