Abstract
This paper presents a low cost, portable flow measurement device, utilizing a 3D printed housing, that is suitable for spirometry applications. The system consists of three main parts, namely the flow sensor, the 3D printed housing and the control electronics circuit. Extensive simulations via FEA analysis were conducted in order to obtain the optimum design for the sensor housing so as to maintain laminar flow conditions within the whole flow range. The flow sensor is of the thermal type and utilizes three thermistors that are placed in series. The system is able to operate in both hot-wire and in calorimetric principle under constant temperature or constant current conditions. An electronic circuit has been designed and fabricated in order to control the device operation and process the corresponding measurement data. The fabricated system was evaluated extensively for all the operation conditions.
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