A micro CO2 gas sensor based on sensing of pH-sensitive hydrogel swelling by means of a pressure sensor

Herber, S. and Bomer, J. and Olthuis, W. and Bergveld, P. and Berg van den, A. (2005) A micro CO2 gas sensor based on sensing of pH-sensitive hydrogel swelling by means of a pressure sensor. In: 13th International Conference on Solid-StateSensors, Actuators and Microsystems, Transducers 2005, June 5-9, 2005, Seoul, Korea.

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Abstract:	In this paper a sensor is presented for the detection of carbon dioxide gas inside the stomach in order to diagnose gastrointestinal ischemia. The operational principle of the sensor is measuring the CO/sub 2/ induced pressure generation of a confined pH-sensitive hydrogel by means of a micro pressure sensor. The sensor is capable of measuring CO/sub 2/ with a response time between 2 and 4 minutes and a maximum pressure of 0.29/spl times/10/sup 5/ Pa at 20 kPa CO/sub 2/. The sensor is able to resist up to 1 M HCl acid as can be present inside the stomach. The results are very promising for real application and clinical trials are planned.
Item Type:	Conference or Workshop Item
Copyright:	© 2005 IEEE
Faculty:	Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:	Biomedical and Environmental Sensor systems (BIOS)
Link to this item:	http://purl.utwente.nl/publications/53236
Official URL:	http://dx.doi.org/10.1109/SENSOR.2005.1497279
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