Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-04-12
1977-03-22
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 5, G01R 2704
Patent
active
040139506
ABSTRACT:
Apparatus for measuring the electromagnetic (E/M) impedance of soil is diosed. This impedance is obtained by measuring the voltage standing wave ratio and first minimum with the disclosed apparatus. The apparatus comprises a trombone slotted line in combination with an earth probe. The trombone slotted line comprises a telescoping outer conductor and a telescoping inner conductor coaxial with and surrounded by the outer conductor. The inner part of the telescoping outer conductor has a slot along its length and a probe that passes through the outer part of the telescoping outer conductor extends into this slot. The earth probe also comprises an outer conductor and a coaxial inner conductor surrounded by the outer conductor. One end of the inner telescoping conductor of the slotted line mates with the inner conductor of the earth probe and the other end of the telescoping inner conductor of the slotted line is coupled to coupling means for coupling RF energy to the apparatus. The outer conductor of the trombone slotted line is secured to the outer conductor of the earth probe. A rack and pinion gear arrangement is provided on the outer conductor of the slotted line to telescope the slotted line.
REFERENCES:
patent: 2455940 (1948-12-01), Muskat et al.
patent: 2455942 (1948-12-01), Coggeshall et al.
patent: 2489092 (1949-11-01), Larrick
patent: 3114875 (1963-12-01), Haagensen
Edelberg Nathan
Krawczewicz Stanley T.
The United States of America as represented by the Secretary of
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