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Electric potential sensor under development

Posted: 16 Nov 2010 ?? ?Print Version ?Bookmark and Share

Keywords:electric potential? sensor? power? voltmeter?

Plessey Semiconductors Ltd will be manufacturing and commercializing an electric potential sensor (EPS) developed by researchers at the University of Sussex. The sensor is seen as potentially disruptive in multiple markets.

Plessey and the University of Sussex have not revealed details of the agreement.

Plessey is a recently-formed company that has taken over the products, IP and a wafer fabrication facility formerly associated with the name.

The sensor can be used to measure electric potential without drawing current according to the man who developed the device, Robert Prance of the university's centre for physical electronics and quantum technology. "It's the almost perfect voltmeter. Electrically non-invasive and with minimal field disturbance," said Prance.

The sensor's main feature is the electronically-enhanced input impedance achieved by the use of feedback techniques leading to input impedances as high as 1017 at 1Hz. These sensors can then function as voltmeters for AC signals from various sources provided the input impedance is much larger than the sensor-source impedance.

Sensors made by the university research team have demonstrated a sensitivity of microvolts per meter and an accuracy of 2 percent.

CMOS compatibility
As the sensor operates through capacitive coupling, without contact and at long range, the applications are broad, from remote electrocardiopgraphy (ECG) and electroencephalography (EEG) to monitoring muscle movements and breathing and on to non-contact measurements of voltage in electronic circuits. The sensor, which requires no physical or resistive contact to make measurements, will enable novel medical equipment to devices that can "see" through walls, Plessey said. The applications therefore include medical diagnosis and imaging, security, and the human-machine interface.

Keith Strickland, technology director at Plessey Semiconductors, said, "The EPS technology created by Professor Prance's team at the University of Sussex is a significant innovation that will have a wide-ranging disruptive impact in the sensor market. In conjunction with the University of Sussex, Plessey will be developing an exciting range of EPS sensors utilizing our in-house expertise in semiconductor process technology and design. In particular, our expertise with CMOS image sensors will enable us create very large chips with arrays of EPS sensors. We expect to have our first product prototype available in Q3 of next year for a medical diagnosis product that will significantly advance the ease and quality of cardiac measurements."

Prance said that since the technology consumes little power, it is possible to power the device by energy harvesting.

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