Person: Höra, Christian
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1987
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Höra
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Christian
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Veröffentlichung A chip-integrated optical microfluidic pressure sensor(2017) Kiontke, Andreas; Höra, Christian; Pahl, Maik; Belder, DetlevPressure sensing inside microfluidic channels in glass chips was achieved by integrating an oxygen sensitive luminescent sensor layer inside of an air-filled cavity. The device enables reliable determination of gas pressures, as well as flow rate-induced liquid backpressures at various positions along a channel. This optically readable microfluidic pressure sensor allows on-chip pressure sensing with high sensitivity at up to 9 mbar, and unsurpassed working range from atmospheric pressure up to 5 bar. Investigation of the system revealed high flexibility, stability and reproducibility of the proposed method. In addition to the pressure determination, the integrated luminescent sensor allows simultaneous detection of the temperature and oxygen content of a process medium. Quelle: http://www.sciencedirect.com/Veröffentlichung A chip-integrated highly variable thermal flow rate sensor(2016) Höra, Christian; Skadell, Mirjam M.; Pfeiffer, Simon A.In this work, we present an approach for seamless integration of a highly variable flow rate sensor in chip based microfluidic devices. This novel, optically readable microfluidic calorimetric flow rate sensor is realized by a combination of an inkjet printed heating element with a fluorescent sensor layer inside microfluidic channels. This enables to read out flow rate induced variances in the temperature profile along the channels, which results in an unsurpassed wide working range of the microfluidic anemometer from the lower nl min-1 range up to several 100 Nano-l min-1. The system was thoroughly investigated and revealed high flexibility, stability, repeatability and sensitivity. Quelle: http://www.sciencedirect.com