Broadband Air-Coupled Ultrasound Emitter and Receiver Enable Simultaneous Measurement of Thickness and Speed of Sound in Solids

被引:8
作者
Bente, Klaas [1 ,2 ]
Rus, Janez [3 ,4 ]
Mooshofer, Hubert [5 ]
Gaal, Mate [1 ]
Grosse, Christian Ulrich [3 ]
机构
[1] Bundesanstalt Materialforschung und prufung BAM, Acoust & Electromagnet Methods 8 4, Unter Eichen 87, D-12205 Berlin, Germany
[2] Hlth & Med Univ, Olymp Weg 1, D-14471 Potsdam, Germany
[3] Tech Univ Munich, Chair Nondestruct Testing, Ctr Bldg Mat, Franz Langinger Str 10, D-81245 Munich, Germany
[4] Swiss Fed Inst Technol Lausanne, Lab Wave Engn, CH-1015 Lausanne, Switzerland
[5] Siemens AG, Corp Technol, Otto Hahn Ring 6, D-81739 Munich, Germany
关键词
thermoacoustic emitter; optical microphone; air-coupled ultrasound; local resonance; thickness measurement; thickness resonance; TRANSDUCERS;
D O I
10.3390/s23031379
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Air-coupled ultrasound sensors have advantages over contact ultrasound sensors when a sample should not become contaminated or influenced by the couplant or the measurement has to be a fast and automated inline process. Thereby, air-coupled transducers must emit high-energy pulses due to the low air-to-solid power transmission ratios (10(-3) to 10(-8)). Currently used resonant transducers trade bandwidth-a prerequisite for material parameter analysis-against pulse energy. Here we show that a combination of a non-resonant ultrasound emitter and a non-resonant detector enables the generation and detection of pulses that are both high in amplitude (130 dB) and bandwidth (2 mu s pulse width). We further show an initial application: the detection of reflections inside of a carbon fiber reinforced plastic plate with thicknesses between 1.7 mm and 10 mm. As the sensors work contact-free, the time of flight and the period of the in-plate reflections are independent parameters. Hence, a variation of ultrasound velocity is distinguishable from a variation of plate thickness and both properties are determined simultaneously. The sensor combination is likely to find numerous industrial applications necessitating high automation capacity and opens possibilities for air-coupled, single-side ultrasonic inspection.
引用
收藏
页数:9
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