Patent ID: 6011476
Filing Date: 2000-01-04
Classification: G01N,G08B

Abstract:
An apparatus to detect a change in dielectrokinesis effects in an environment characterized at any instant by an instantaneous ambient dielectrokinetic condition, comprising:a current detector for electrical connection to an antenna to receive from the antenna an antenna signal indicative of said change in dielectrokinesis effects, comprising:a low input current amplifier having a voltage noise spectral density curve to operate at 50 Hz or less and connected to receive the antenna signal and to output a first signal, andan amplifier stage connected in series with the low input current amplifier to amplify the first signal into an output signal for use by a detection device to identify the change in dielectrokinesis effects, wherein the amplifier stage includes a zeroing circuit to periodically standardize the output signal to a predetermined value commensurate with the instantaneous ambient dielectrokinetic condition.