Documents / Report
This Defense Intelligence Agency reference document, dated 31 March 2010 (DIA-08-1003-020), was one of a series of advanced technology reports produced in FY 2009 under the Advanced Aerospace Weapon System Applications (AAWSA) program. It surveys biosensors and BioMEMS, covering brain-implanted neuroelectrodes, drug-delivery pumps, implantable glucose sensors, brain-machine interfaces, retinal prostheses, microfluidic lab chips, NASA cell culture systems, and microcantilever sensors. It concludes that the field is expanding rapidly toward nanomechanical systems.
UNCLASSIFIED/ /F&R: &FFHiIAL Wlili &HLY Sensing Junctions Figure 13. A MEMS Thermopile Glucose Sensor (Towe et al., Arizona State University) Heat energy released in the gel is measured by the thermopile and is characterized in terms of kiloJoules (kJ) per mole of glucose consumed. At concentrations of glucose that are common in the blood stream, the temperature rise is very small, on the order of a hundredth of a degree (10 millidegrees). Measuring this temperature change in the presence of ambient body heat or room- temperature changes of a few degrees is a daunting task, but can be done. The measurement of the small reaction temperature in the face of possible ambient temperature shifts is accomplished by the use of a differential temperature measurement system. This sensor employs what is known as the Seebeck Effect whereby dissimilar metals heated at their junction produce a voltage that is proportional to temperature. This concept is shown in Figure 14. This principle is then implemented as an array of metal junctions that when connected in series produce a higher output in order to detect smaller temperature changes. 17 UNCLASSIFIED/ /F&R: 8FFIIIAL WliEii &••blf
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Report, from the dia collection. The PDF is mirrored here; the original link is above. 45 pages are in the text index: search them above, or from the library's search.