Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1977-06-24
1978-10-03
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 67, G01V 310
Patent
active
041186621
ABSTRACT:
A method and means is described for a concealed structure locating and surveying exciter apparatus, and more particularly, to a portable device which couples, either by direct or indirect connection, high frequency alternating current energy into a more conductive structure which is usually obscured in a less conductive covert medium. The preferred embodiment provides two different frequency high stability sources of first oscillations the outputs of which are alternately switched or gated by a very low frequency source of second oscillations. The alternating first oscillations are combined in a summing amplifier and caused to drive an output coupling means. The amplified outout is further modulated, usually at an audio frequency rate, by a low frequency source of third oscillations. The result is a composite electromagnetic waveform output which switches alternatively between two distinctly spaced radio frequency signals at a slow, very low frequency rate while the two radio frequency emissions are simultaneously amplitude modulated by a steady pitch audio tone.
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Strecker Gerard R.
Weber Harold James
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