Chemistry: electrical and wave energy – Apparatus – Electrolytic
Reexamination Certificate
2007-06-12
2010-11-30
Nguyen, Nam X (Department: 1795)
Chemistry: electrical and wave energy
Apparatus
Electrolytic
C204S400000, C324S693000, C324S700000, C324S076110, C422S082010
Reexamination Certificate
active
07842174
ABSTRACT:
A handheld sensor device is provided for measuring an ion concentration in a solution. The solution is in an electrochemical cell that includes a counter electrode, a working electrode, and a reference electrode. The sensor includes a control amplifier configured to provide a current through the counter electrode and the working electrode so as to maintain a predetermined voltage between the working electrode and the reference electrode. The sensor also includes a current amplifier configured to measure the current provided through the counter electrode and the working electrode. In one embodiment, the sensor also includes a direct digital frequency synthesizer (DDFS) including a phase accumulator. The DDFS is configured to selectively generate a waveform specified by an electrochemical technique such as square wave voltammetry, cyclic voltammetry, linear sweep voltammetry, differential-pulse polarography, normal-pulse polarography, or other known electrochemical techniques. An example microelectrode array usable with the handheld sensor is also provided.
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Dou Huifang
Zhou Anhong
Nguyen Nam X
Thai Susan
Utah State University
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