Nonlinear Complex Resistivity complex resistivity (NLCR) is a
geophysical method of stimulating materials with an electrical
current sine wave of variable frequency and measuring the
voltage response. The ratio of the amplitudes of the voltage to
the current normalized by the geometry of the electrodes is the
magnitude of the resistivity. The shift in time between the
stimulus current and response voltage is a phase shift.
Deconvolved response by stimulus and summed root mean square
harmonics are the total harmonic distortion. Deviation of the
real and imaginary parts of the complex resistivity transfer
function versus frequency from the Hilbert transform expectation
are Hilbert Distortions. Both distortions are measures of
nonlinearity. complex resistivity measurements as a function of
frequency from 0.001 Hz to 1,000 Hz are useful in a variety of
applications where remote measurements of active chemical
processes are important. As all chemical reactions involve
electron charge movement, NLCR can measure or