G - Physics – 01 – R
Patent
G - Physics
01
R
324/59
G01R 23/02 (2006.01) G01V 3/12 (2006.01)
Patent
CA 1106448
ABSTRACT OF THE DISCLOSURE: The invention relates to a direct and continuous receiving and measuring device for electrical magnetic or acoustic signals. The device comprises an amplifier stage and a broadband filtering stage at the input, a local oscillator for supplying a reference signal, a measuring stage, a mixer to which the local oscillator and the broadband filtering stage are connected and a low-frequency filtering stage connected to the mixer. The invention also concerns a measuring process for measuring the distribution of the impedance of a medium. The process comprises the steps of receiving on a receiver natural or artificial waves propagating themselves in the medium and detected by pick-ups, selecting the desired frequency decades and selectively filtering for the selected decades after transposi- tion to low frequency, and treating the low-frequency filtered signals to measure the output voltage of each the pick-up and the phase difference between any two of the pick-ups by averaging out amplitudes and phases and bringing the values obtained back to the output of the pick-ups.
288761
Corbefin Rene
Gerbel Lucien
Waeselynck Michel
Robic Robic & Associes/associates
Societe Nationale Elf Aquitaine
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