The APRA project aims at using acoustic sensors for protection around airports, assist helicopters in landing and navigation and avoid collissions between small airplanes or UAV's. At the MSS group the research focuses on improved acoustic particle velocity sensors in order to accurately detect the direction of a sound wave. The research is performed in cooperation with Microflown Technologies BV.
The APRA project is funded by GO-EFRO.
Fig. 1: Crossed wire 2D particle velocity sensor chip.
 O. Pjetri, R.J. Wiegerink, G.J.M. Krijnen, (2015) A 2D particle velocity sensor with minimal flow-disturbance. In: Proceedings IEEE Sensors 2015, 01-04 Nov 2015, Busan, Korea. pp. 1307-1310. pdf
 O. Pjetri, R.J. Wiegerink, T.S.J. Lammerink, G.J.M Krijnen, (2013) A crossed-wire 2-dimensional acoustic particle velocity sensor. In: IEEE Sensors 2013, 3-6 Nov 2013, Baltimore, USA. pp. 1-4. pdf
 O. Pjetri, R.J. Wiegerink, T.S.J. Lammerink, G.J.M. and Krijnen, (2013) A novel two dimensional particle velocity sensor. In: International Congress on Acoustics, 02-07 jun 2013, Montreal, Canada. pp. 1-6. pdf