Title :
A micro CO2 gas sensor based on sensing of pH-sensitive hydrogel swelling by means of a pressure sensor
Author :
Herber, S. ; Bomer, J. ; Olthuis, W. ; Bergveld, P. ; van den Berg, A.
Author_Institution :
MESA Res. Inst., Twente Univ., Enschede, Netherlands
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 CO2 induced pressure generation of a confined pH-sensitive hydrogel by means of a micro pressure sensor. The sensor is capable of measuring CO2 with a response time between 2 and 4 minutes and a maximum pressure of 0.29×105 Pa at 20 kPa CO2. 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.
Keywords :
carbon compounds; gas sensors; microsensors; organic compounds; patient diagnosis; pressure sensors; 0.29E5 Pa; 20 kPa; CO2; HCl acid; biosensors; carbon dioxide gas detection; gastrointestinal ischemia diagnosis; induced pressure generation; micro gas sensors; micro pressure sensor; pH-sensitive hydrogel swelling; patient diagnosis; Carbon dioxide; Clinical trials; Delay; Gas detectors; Gastrointestinal tract; Ischemic pain; Pressure measurement; Resists; Stomach; Time measurement;
Conference_Titel :
Solid-State Sensors, Actuators and Microsystems, 2005. Digest of Technical Papers. TRANSDUCERS '05. The 13th International Conference on
Print_ISBN :
0-7803-8994-8
DOI :
10.1109/SENSOR.2005.1497279
