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Monolithic Integration of Micro-Channel on Disposable Flow Sensors for Medical Applications

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7 Author(s)
Billat, S. ; HSG-IMIT, Villingen-Schwenningen ; Kliche, K. ; Gronmaier, R. ; Nommensen, P.
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We report on the integration of a micro flow channel with a thermal flow sensor chip. Two different technologies were investigated: First the fluid channel is performed at the back side of the standard HSG-IMIT flow sensor chip using a double KOH etching process (DKOH). The second technology consists of a bond process between the flow sensor die and a polydimethylsiloxane (PDMS) sheet containing the channel. Both sensor types can be used for detecting flow rates in the range of 0.1- 5.0 mu1/min (H2O) and/or pressure differences of 10-600 Pa. Compared to our previous sensor design [1] this leads to reduced packaging costs, increased reproducibility (better than 1%) and in particular a higher sensitivity at low flow rates. Finally a concept of an adhesive-free packaging of the sensor is presented.

Published in:

Solid-State Sensors, Actuators and Microsystems Conference, 2007. TRANSDUCERS 2007. International

Date of Conference:

10-14 June 2007

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