Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – For fault location
Patent
1994-06-27
1995-12-19
Wieder, Kenneth A.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
For fault location
324613, 324501, 324520, 324 7623, 455 673, G01R 2300
Patent
active
054771501
ABSTRACT:
A principal object of the invention is to detect sparks or arcs (12) in electric circuits (13) or otherwise to detect a spectrum of a broad band of distinct instaneous radio frequencies in radio frequency noise. The invention rejects extraneous narrow-band signals having frequencies within the broad band, such as by means of filters (21, 27, 29) or a balanced mixer arrangement (32-39 ) . The mixer 37 may be fed from a radio frequency signal duplicator (32, 33, 34) having an input (25) coupled to a source of the spectrum, a first output for one spectrum as duplicated by that duplicator connected to one mixer input (35), and a second output for the other spectrum as duplicated by that duplicator connected to tile other mixer input (36). Alternatively, the radio frequency mixer (37) may receive the output of a wide band noise generator (68) at its other input (36, FIG. 5 ). A combination of multitude of the distinct instantaneous radio frequencies indicative of the spectrum or the arc (12 ) is detected, such as with a frequency combination detector (42) having an input (40) coupled to the radio frequency mixer output (38).
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Ham, Jr. Howard M.
Keenan James J.
Hendry Mechanical Works
Solis Jose M.
Wieder Kenneth A.
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