Mr. Jochen Huber Profile

Jochen Huber

at Fraunhofer-IPM

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Publications (2)

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Proceedings Article | 21 May 2015 Paper

Photoacoustic CO2 sensor system: design and potential for miniaturization and integration in silicon

J. Huber, J. Wöllenstein

Proceedings Volume 9517, 951715 (2015) https://doi.org/10.1117/12.2179157

KEYWORDS: Sensors, Absorption, Carbon dioxide, Silicon, Photoacoustic spectroscopy, Signal detection, Sapphire, Infrared sensors, Gas sensors, Thermography

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The detection of CO₂ indoors has a large impact on today’s sensor market. The ambient room climate is important for human health and wellbeing. The CO₂ concentration is a main indicator for indoor climate and correlates with the number of persons inside a room. People in Europe spend more than 90% of their time indoors. This leads to a high demand for miniaturized and energy efficient CO₂ sensors. To realize small and energy-efficient mass-market sensors, we develop novel miniaturized photoacoustic sensor systems with optimized design for real-time and selective CO₂ detection. The sensor system consists of two chambers, a measurement and a detection chamber. The detection chamber consists of an integrated pressure sensor under special gas atmosphere. As pressure sensor we use a commercially available cell phone microphone. We describe a possible miniaturization process of the developed system by regarding the possibility of integration of all sensor parts. The system is manufactured in precision mechanics with IR-optical sapphire windows as optical connections. During the miniaturization process the sapphire windows are replaced by Si chips with a special IR anti-reflection coating. The developed system is characterized in detail with gas measurements and optical transmission investigations. The results of the characterization process offer a high potential for further miniaturization with high capability for mass market applications.

Proceedings Article | 17 May 2013 Paper

Detection of bad indoor environment with a miniaturized gas sensor system

J. Huber, R. Binninger, K. Schmitt, J. Wöllenstein

Proceedings Volume 8763, 87632H (2013) https://doi.org/10.1117/12.2017425

KEYWORDS: Sensors, Gas sensors, Adsorption, Temperature metrology, Gases, Buildings, Environmental sensing, Control systems, Electronic circuits, Particles

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Bad indoor environment is often the reason for health impairment of people who spend most of their time indoors. Modern buildings are almost air tight and air exchange is too low. This problem often occurs in retrofitted buildings. A long time result can be mold formation in buildings. To get early information about bad indoor climate or mold formation, sensor systems which detect volatile organic compounds (VOC) are needed. The biggest challenge in measuring VOC gases in this scenario are the small concentrations. We present a miniaturized preconcentrating gas sensor system with two chambers for measuring organic gases. Preconcentration is realized with a thermoelectric element to activate sampling and desorption process in one chamber, delivering temperature gradients to a highly porous surface. The second chamber consists of a gas detecting element to indicate the preconcentrated VOC. By driving a temperature cycle with longtime cooling and fast heating the gas is preconcentrated and then desorbed quickly. Furthermore an electronic circuit board has been developed to control the complete system. The result is a complete sensor system with mechanical setup, electronic control, measurement, analyzation and peripheral communication. Measurements regarding temperature behavior of the system are performed, as measurements with VOC.

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