Electricity: measuring and testing – Electrostatic field – Using modulation-type electrometer
Patent
1980-08-15
1983-01-25
Tokar, Michael J.
Electricity: measuring and testing
Electrostatic field
Using modulation-type electrometer
324 72, 324457, G01R 528
Patent
active
043706169
ABSTRACT:
An electrostatic detector comprising a detector electrode sensitive to electrostatic quantities such as fields, voltages, charges and the like, means for varying the capacitive coupling between the electrode and an electrostatic quantity to which the electrode is exposed, and an operational amplifier having an output and a pair of inputs, one of which is operatively associated with the amplifier summing node. A resistive feedback path is defined between the amplifier output and the summing node, the detector electrode is connected to the one amplifier input so that the detector electrode is operated directly into the amplifier summing node, and the other amplifier input is connected to an electrical reference, such as ground. As a result, the detector electrode is held at virtual ground and the amplifier is operated as a current to voltage converter to cause an output voltage to be generated equal to the product of the input current and the resistance of the feedback path. The detector can be employed in a non-contacting electrostatic voltmeter for making surface voltage measurements and which employs any one of several capacitance modulation schemes.
REFERENCES:
patent: 3667036 (1972-05-01), Searchman
patent: 3852667 (1974-12-01), Williams et al.
patent: 4147981 (1979-04-01), Williams
patent: 4205267 (1980-05-01), Williams
patent: 4270090 (1981-05-01), Williams
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