Today I found a document about some work SRICO had been doing with the US Army on dry biopotential acquistion. Essentially their device uses lithium niobate to alter the polarization of a beam of light traveling through a fiber. The major technical challenge is noise from the fiber-optic since microphonic noise can affect the beam. How the contact is made is not completely clear though. The sensor is large, about 5 cm square.
Posted by torque at June 10, 2003 11:56 AM | TrackBackHi,
I am one of the inventors of the SRICO Photrode (this device used to be called an "Optrode"). Where did you get the information about the fiber optic lead microphony and the 5 cm square dimensions? This sounds like it came from one of our early Phase I SBIR reports a few years back.
Actually, our more recent prototype devices generally had rectangular packaging but were still not built for size. Work is presently underway for significant reduction in the chip and packaging size.
Contact is either through conducting rubber pads or capacitive coupling through clothing (EKG only).
Dr. Stuart A. Kingsley
Chief Scientist
SRICO, Inc.
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