Acoustic signals generated by lasers
A novel laser-controlled audio system was developed at KIT
Exhibitors
Description
Today, sound generation is used in many technological and scientific areas. Common loudspeakers are usually based on electromechanical transducers that convert electrical signals into mechanical vibrations and finally into acoustic signals. Such devices are usually large, heavy and spatially bound, and they can only reproduce sound at their respective location. Researchers at the University of Patras (Greece) and the Engler-Bunte Institute (EBI) at KIT have jointly developed a method to transmit acoustic information over long distances without contact and to reproduce it directly at a distant position. The new system generates complex sound or ultrasound signals by means of optoacoustic transmission: point sources of sound are generated by plasma. One or more lasers are used for this purpose. Sound sources with nearly ideal spatial, temporal and spectral characteristics can be generated. At the target location, the sound signal is interpreted directly in the surrounding atmosphere (demodulation) by receiving the local pressure wave as a signal from human hearing. The maximum frequency depends on the laser. The laser-generated sound is inherently broadband and thus suitable for reproducing impulsive and complex continuous sound events. The developed laser sound system can transmit sound waves over long distances without the need for on-site receiver, demodulation units or power. Depending on the laser specification, the effective bandwidth of the system can cover the entire audible range or even extend into the ultrasound range. KIT is looking for partners for development projects and for industrial application.
You can get an overview of this technology at KIT stand. More details can be exchanged individually with the responsible scientific employees of KIT after the industry fair.
Karlsruher Institut für Technologie (KIT)
- Kaiserstr. 12
- 76131 Karlsruhe
- Germany
Contact
- Phone: +49 721608 -0
- Fax: +49 721608 44290
Contact
Karlsruher Institut für Technologie (KIT)
- Kaiserstr. 12
- 76131 Karlsruhe
- Germany
Locations
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