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Measurement of Bioelectric Current with a Vibrating Probe

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Published on: January 4, 2011

Triple probe signal detection electronics for systems lacking a well defined ground.

R Compeau¹, M Gilmore, C Watts

¹University of New Mexico, 1 University of New Mexico, Albuquerque, New Mexico 87131, USA.

The Review of Scientific Instruments

|December 3, 2008

Summary

This study introduces a novel circuit for triple probes, enabling faster plasma measurements. The design effectively handles high floating potentials in challenging plasma environments.

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Scanning-probe Single-electron Capacitance Spectroscopy

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Area of Science:

Plasma Physics
Low-Temperature Plasmas
Edge Plasma Diagnostics

Background:

Triple probes offer simultaneous measurement of electron temperature, ion density, and floating potential in low-temperature and edge plasmas.
Standard probe techniques often require potential sweeping, limiting time resolution.
Undefined or high plasma potentials pose challenges for accurate signal digitization.

Purpose of the Study:

To present a novel signal detection circuit for triple probes.
To enable fast time-resolved plasma parameter measurements.
To address challenges posed by high or undefined plasma potentials.

Main Methods:

Development of a signal detection circuit using inexpensive operational amplifiers.
Implementation of a novel floating bias generation configuration.
Application of common mode rejection techniques for signal digitization.

Main Results:

The described circuit facilitates high time-resolution measurements.
Effective handling of high plasma (or floating) potentials is achieved.
Simultaneous measurement of key plasma parameters is enabled.

Conclusions:

The novel circuit design provides a cost-effective solution for triple probe measurements.
This technique enhances the applicability of triple probes in challenging plasma environments.
Fast and accurate plasma diagnostics are achievable even with high floating potentials.