We have developed a wireless humidity detection system, which use the inexpensive magnetoelastic resonance (MER) sensors for wireless and remote detection of humidity. With this reader, a MER sensor can be detected at a 40 cm distance. The wireless humidity detection system can be applied to measure humidity in places that are hard to reach, for instance behind walls, in closed packages and for monitoring moisture in food, pulp and sand. The wireless sensor system is under development and there is currently no general purpose system for sale. However, we have a few readout units and sensors for evaluation and development. We have performed field tests of the system within many business areas, such as the automotive industry, the building industry and the personal care industry.
Measurement of humidity through a concrete paving stone. The handheld readout unit is held in front of the stone and a humidity sensitive magnetoelastic sensor is held behind.