Working area
A laser scanning doppler vibrometer is used for the non-contact measurement of the vibration of surfaces. At present its main application is in the development of ultrasonic echo methods for testing concrete elements. Here it works as an ultrasonic receiver in the frequency range from 50 to 200 kHz. The laservibrometer is especially useful for scanning large surface areas in combination with three-dimensional reconstruction calculations. This enables tendon ducts in prestressed concret elements to be imaged and injections faults localised. Current development work addresses the possibilities of improving the signal to noise ratio and optimising the method in comparison with other scanning techniques.
Equipment for the acoustic scanning of concrete surfaces with a fixed location of the transmitting transducer. For the investigation of tendon ducts several cross-sections are combined and evaluated by means of a three-dimensional reconstruction calculation (enlarged picture).
Service
Division 8.2
Dr. rer. nat.