Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-06-09
1978-06-13
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 5, 324 67, G01V 310, G01D 2104, G01V 308
Patent
active
040951677
ABSTRACT:
My invention relates to improved method and means for a portable concealed structure locating and surveying exciter apparatus, and more particularly, to a portable device which couples by indirect connection alternating current energy into a structure which is usually obscured in a covert medium. A high stability source of first oscillations is provided which is undisturbed by perturbations in the degree of coupling between the concealed structure and the exciter, together with an adjustment, which is operable by a user of average skill, for maximizing the induction field when the apparatus is in the immediate presence of a large conductive structure which can otherwise affect the resonant efficiency of the inducer, thereby permitting the most effective use of an associated electromagnetic field detector apparatus of high selectivity. A mechanical resonant device of less costly form operating at a periodic rate not necessarily the same as, but rather at some lower or higher multiple of the exciter principal operating frequency is shown. A pulse shaper is provided which serves to condition the driving signal, as applied to the resonant inducer, for a condition of maximum power output and a minimum battery current.
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