To explore and leverage novel sensing approaches enabled by the patented membrane-free optical microphone technology, XARION pursues a number of national and international research collaborations.

Non-Destructive Testing (NDT)
A broadband sensor is best paired with a broadband ultrasound source. Therefore, XARION actively develops broadband ultrasound emission technologies, specifically Laser Ultrasonics (LUS), and Thermacoustic Emitters for pulse-echo measurements. Capable of generating short, reverberation-free ultrasound pulses, these technologies, in combination with the optical microphone, pave the way for robust and cost-effective single sided non-destructive, air-coupled testing methods.

Machine Monitoring, Process Control and Acoustic Emission (AE)
There are numerous industrial processes that can only be monitored via non-contact methods. For these processes, the optical microphone provides information about acoustic emissions at high ultrasound frequencies in the several hundreds of kHz. Current research focuses on robust analysis methods to use this so-far untapped information for fail-state prediction and process surveillance. In collaboration with our partners, we explore spectrally resolved high-frequency emissions detected by XARIONs optical microphone as input for pattern recognition and machine learning algorithms. 

Photoacoustic Imaging (PAI)
The interaction of a short laser pulse with biological tissue generates ultrasound. This is the basic principle behind Photoacoustic Imaging, a rapidly emerging biomedical imaging technique. XARIONs liquid-coupled version of the optical microphone has shown to be a perfect match for Photoacoustic Imaging: some of its advantages are its excellent sensitivity at compact sensor size, optical transparency for the through-excitation by lasers used in PAI, and stray-light immunity. Current research focuses on Photoacoustic Laparoscopy, as well as fast-scanning optical-resolution Photoacoustic Microscopy (OR-PAM).

B. Fischer, Nature Photonics 10, 356–358 (2016)
S. Preisser et al., Biomedical Optics Express 7(10), 4171-4186 (2016)