Embedded Ultrasonic Transducers for Active and Passive Concrete Monitoring

Sensors

Ernst Niederleithinger¹  Julia Wolf¹  Frank Mielentz¹  Herbert Wiggenhauser¹  Stephan Pirskawetz¹ 

关键词: ultrasound;    transmission;    concrete;    damages;    cracks;    stress;   

DOI  :  10.3390/s150509756

来源: mdpi

【 摘 要 】

Recently developed new transducers for ultrasonic transmission, which can be embedded right into concrete, are now used for non-destructive permanent monitoring of concrete. They can be installed during construction or thereafter. Large volumes of concrete can be monitored for changes of material properties by a limited number of transducers. The transducer design, the main properties as well as installation procedures are presented. It is shown that compressional waves with a central frequency of 62 kHz are mainly generated around the transducer’s axis. The transducer can be used as a transmitter or receiver. Application examples demonstrate that the transducers can be used to monitor concrete conditions parameters (stress, temperature, …) as well as damages in an early state or the detection of acoustic events (e.g., crack opening). Besides application in civil engineering our setups can also be used for model studies in geosciences.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.