A kind of underwater electric field signal active detection circuit and detection method

Abstract

The invention discloses an underwater electric field signal active detection circuit and a detection method, belonging to the technical field of underwater electric field signal detection, capable of avoiding the interference of low-frequency electric field signals by zero drift and offset voltage in a differential amplifier circuit in passive electric field measurement. The detection circuit includes an AC excitation source, a dipole electrode, a current limiting resistor R6, a DC isolation capacitor C4, a grounding resistor R7, a wave detector, an integrator and a filter. The frequency of the AC excitation source is more than 20 times the frequency of the underwater electric field signal to be measured; the AC excitation source is connected to the signal input end of the dipole electrode, and the signal output end of the dipole electrode is connected to the detector through the DC isolation capacitor C4; The pole electrodes are located underwater. Both ends of the DC isolation capacitor C4 are grounded through the current limiting resistor R6 and the grounding resistor R7 respectively. The rear end of the detector is connected to an integrator and a filter in sequence. The integrator output signal is fed back to the signal input of the dipole motor.

Description

technical field [0001] The invention relates to the technical field of underwater electric field signal detection, in particular to an active detection circuit and detection method for underwater electric field signals. Background technique [0002] At present, in the underwater electric field measurement, the potential difference between two points in the direction of a certain axis of the underwater electric field space is actually measured. Usually passive measurements are taken, such as figure 2 Shown is a traditional passive underwater electric field signal detection circuit, in which the electric field sensor uses Ag / AgCl electrodes or polymer electrodes to form a dipole electrode array, and the dipole electrodes include the first electrode and the second electrode. The rear stages of the two electrodes of the sub-electrode are respectively connected to the pre-circuit, and the current signal is converted into a voltage signal. After the potential voltage collected by...

AI Technical Summary

Problems solved by technology

When this method needs to measure the underwater electric field signal of the target ship with an extremely low frequency below 0.2Hz, the inherent zero drift and DC bias voltage of the differential amplifier circuit itself will form an extremely low frequency interference signal, which will affect the test results.

[0003] In the process of underwater electric field measurement, when it is necessary to measure the extremely low-frequency underwater electric field signal of the target ship, the zero-point drift and DC bias voltage of the differential amplifier circuit itself form an extremely low-frequency interference signal, which affects the test results.

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