Two approaches to construction of vibrating probes for electrical current measurement in solution

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Abstract
Two systems are described that implement the vibrating probe method for recording the voltage field in electrolyte solutions. The method has a spatial resolution of 5–40 μm and very low drift. The first system is a simple device that allows inexpensive but reliable use of the method to record the field in one dimension. It is based on a metal electrode vibrating along a line, with power supplied by a single piezoelectric bimorph. The second is a more complex system, with computer support, that measures the field in two dimensions, acquires the data to the computer disk, and plots the field measurement on a video image of the experimental preparation. A π‐shaped linkage of three bimorphs is used to move the metal electrode in two dimensions. Motor micrometers with optical encoders are used to move the electrode and monitor its position.