G - Physics – 01 – R
Patent
G - Physics
01
R
324/42
G01R 27/00 (2006.01) G01N 27/22 (2006.01) G01R 27/16 (2006.01) G01R 27/26 (2006.01)
Patent
CA 1123057
Abstract of the Disclosure An oscillator provides an output signal of frequency f0, whose phase is shifted by substantially 45 to obtain a test signal which is coupled by a first cable to a bridge circuit located in proximity to a sample box and interconnected with an active center electrode of that sample box. In response to the test signal the bridge circuit provides a bridge output signal whose frequency is identical to that of the test signal and whose phase relative to that of the test signal and whose amplitude are related to the electrical admittance of particulate material within the sample box. The oscillator output signal is also applied to a phase-shifting network which provides first second third and fourth signals respectively in-phase, 90° out-of-phase 180 out-of-phase and 270 out- of-phase with the test signal. A switching circuit couples the first second third and fourth signals to its output in a predetermined sequence and at a frequency of fa, wherein f0 is much greater than fa, to develop a reference signal which is coupled by a second cable to a first input of a double-balanced mixer located in proximity to the bridge circuit. The bridge output signal is applied to a second input of the double-balanced mixer whereby a time-multiplexed mixer output signal is provided which has four successive DC levels proportional to positive and negative values of the conductance and susceptance components of the bridge output signal. The mixer output signal is coupled via the second cable and temperature and bulk density compensation circuits to first second third and fourth sample and hold circuits. The first and third sample and hold circuits store successive DC levels of the mixer output signal corresponding to positive and negative values of the conductance component and the second and fourth sample and hold circuits store successive DC levels of the mixer output signal corresponding to positive and negative values of the susceptance component. A first operational amplifier takes the absolute difference of the stored DC levels in the first and third sample and hold circuits to provide a first output signs proportional to the conductivity or the particulate material and a second operational amplifier takes the absolute difference of the DC level stored in the second and fourth sample and hold circuits to provide a second output signal proportional to the dielectric coefficient of the particulate material.
327669
Eur-Control Kalle Ab
Smart & Biggar
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