As human hair wigs look just like natural hair, is it prone to similar issues as natural hair, and wigs harboring lice is one of them.
Appropriate Standard Thirty seven carries a free-sprung stability with fake richard mille out regulator, including Patek Philippe’s Gyromax, and the rate is adjusted by simply Four weight screws (within platinum) on the harmony edge.
BayPAT | Acoustic detection of liquid droplets on solid surfaces Skip to page content
Back to overview

Jul 23, 2019

Acoustic detection of liquid droplets on solid surfaces

Physical Sciences, Electrical Engineering

  • Large area monitoring with few acoustic sensors
  • Continuous monitoring of industrial infrastructure
  • Droplet position detection

Your contact

Dr. Jan Hayd

+49 (0) 89 5480177 - 17
Reference Number:


To fully exploit the potential of industrial automation, expected with the rise of the industry 4.0, continuous monitoring of the infrastructure becomes an absolute necessity. This includes for example sensors to monitor if and where a leak has occurred in systems containing liquids. It has long been known that droplets deposited on a surface will attenuate surface acoustic waves (SAW), propagating along said surface. Thus, a series of such sensors, positioned underneath a pipe or reservoir, is able to determine when and where a leak has occurred. The miniaturized design, high thermal stability, and possibility of wireless integration of these SAW sensors make them very promising devices for industrial internet of things applications.

However, conventional SAW sensors are typically made from piezoelectric material and have to be mounted directly on the surface to be monitored. This requires extra precautions when the liquids in question are conducting.


The invented method and device is based on Lamb-wave attenuation1. Exploiting this approach, the piezoelectric sensor elements can be mounted on the backside of any structural material, i.e. glass, plastics, and metal, eliminating the danger of coming in direct contact with the liquid. A particular advantage of such an acoustics-based method is the large area that can be monitored with only a few sensors and even the droplet location on a two-dimensional plane can be determined.

Commercial Opportunities

Industrial use cases include applications such as leak detection and monitoring ­condensation. Further applications include rain detection for smart home systems and wiper control in specialty vehicles.

Development Status

Prototype has been successfully tested


  • 1

    M. Schmitt et al., Proc. Sensoren und Messsysteme 2010, 298-305 (2010)

  • 2


Interested? Get in touch!

Contact a specific team member for individual topics via the Team section or simply use our contact form. You can also click on the button and drop us a line.