DEVICE AND PROCESS FOR DIRECT AND CONTINUOUS RECEIVING AND MEASURING OF ELECTRICAL MAGNETIC AND ACOUSTIC SIGNALS

摘要

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 transposition 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.