Close to an object (in the so-called very near field) the particle velocity and the structural vibration coincide. So therefore Microflown sensors can be used for the non contact measurement of the normal component of the structural velocity. The scanning probe is designed in such way that is possible to measure close to a surface.

The sensor wires of the Microflown are protected by a little cap. This way of packaging does not increase the particle velocity at the element so there is no package gain. The selfnoise therefore is 10dB higher as the ½” probe and the upper usable sound level is also 10dB higher.