Acoustic Sensors

ABSOLUT - Non-destructive analysis and evaluation of thin layers by air-coupled ultrasound

Within the scope of the R & D project to be carried out in cooperation with NetCo Professional Services GmbH an innovative ultrasonic measuring system is to be developed. The non-destructive system is due for the quality testing of fiber composite materials, joining compounds and multimaterials. The aim is the non-contact measurement with air-coupled ultrasound at typical frequencies (f <2 MHz) with considerably improved resolution. The focus is on the characterization of "thinner" layers, as is not possible until now. Processes are provided for both transmission and reflection measurements, which take into account a different accessibility to the multi-layer object under test (one / both sides).

vir-US  - Design of virtual acoustic phased arrays

A method for the accumulation of energy totally free in space without using pre-defined transmission channels would be very advantageous for several application areas in industry. A promising method therefore is the local focus of ultrasonic waves.

VibroTouch - Touchscreens with vibro-tactile feedback at limited visual usability

The project aims to prepare the basis for prospective realization of haptic feedback on touchscreens. For this, the technical conditions and user-/ device-specific requirements are to be analyzed involving also economic aspects. A system concept for the realization of haptic feedback based on vibro-tactile sensation will be developed under consideration of theoretical estimation and experimental tests.

LiquiLab / GasLab - Microbalance sensor systems for investigations in liquids / gases

Quartz crystals can be used as mass sensitive chemical or biological sensors due to the modification of their surface. Using the experience within the development of such sensor systems, the experimental set-ups LiquiLab and GasLab were developed and have been continuously improved.

TILT - Technological and algorithmic improvement of non-invasive ultrasonic liquid level measurement under complex process conditions

Liquid level measurement by ultrasonic clamp-on-sensors is advantageous for numerous applications due to the non-invasive function. In practice, however, different technical reasons (e.g. structure borne sound, misalignment of transducer) hinder the usablility. The project TILT aims to solve those problems and to make the measurement process more practicable.

SAFE  - Sensor-Actuator-based early-warning system for disaster prevention in extreme weather conditions

The project aimed at the development of an interdisciplinary platform of a sensor-actuator-based early-warning system for disaster prevention in extreme weather conditions. On the sensor side a combination of conventional and newly developed cost-effective measurement systems contribute to an improved local forecast and impact assessment due to extreme weather.

Crash detection based on structure-borne sound analysis

The use of structure-borne sound is a promising method to identify and distinguish crash situations based on the structure-dynamic sound emission, which is generated within the initial milliseconds of the defor­mation. The wave propagation through the car body substantially contributes to the measurement system.

MUSCLE - Multi-modal analysis of acoustic sound transmission in clamp on ultrasonic systems

For industrial liquid analysis the non-invasive ultrasonic clamp-on configuration is an interesting approach due to its non-destructive nature and easy handling. However, sophisticated signal analysis is often needed in order to discriminate the measurement effect from disturbances caused by the multimodal sound propagation, occuring from wave propagation within the pipe wall, from ringing or mode conversions.

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