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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Hansen, S.T. Mossawir, B.J. Sanli Ergun, A. Levent Degertekin, F. Khuri-Yakub, B.T. |
| Copyright Year | 1999 |
| Description | Author affiliation: Edward L. Ginzton Lab., Stanford Univ., CA, USA (Hansen, S.T.) |
| Abstract | Nondestructive evaluation techniques which use conventional piezoelectric transducers typically require liquid coupling fluids to improve the impedance mismatch between piezoelectric materials and air. Air-coupled ultrasonic systems can eliminate this requirement if the dynamic range of the system is large enough such that the losses at the air-solid interfaces are tolerable. Capacitive micromachined ultrasonic transducers (cMUTs) have been shown to have more than 100 dB dynamic range when used in bistatic transmission mode. This dynamic range, along with the ability to transmit ultrasound efficiently into air, makes cMUTs ideally suited for air-coupled nondestructive evaluation applications. These transducers can be used either in through transmission experiments at normal incidence to the sample or to excite and detect guided waves in aluminum and composite plates. In this paper, we present results of a pitch-catch transmission system using cMUTs that achieves a dynamic range in excess of 100 dB. The pair of transducers is modeled with an equivalent electrical circuit which predicts the transmission system's insertion loss and dynamic range. We also demonstrate the feasibility of Lamb wave defect detection for one-sided nondestructive evaluation applications. A pair of cMUTs excites and detects the so mode in a 1.2 mm-thick aluminum plate with a received signal-to-noise ratio of 28 dB without signal averaging. |
| Starting Page | 1037 |
| Ending Page | 1040 |
| File Size | 251401 |
| Page Count | 4 |
| File Format | |
| ISBN | 0780357221 |
| ISSN | 10510117 |
| DOI | 10.1109/ULTSYM.1999.849177 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1999-10-17 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Dynamic range Ultrasonic transducers Aluminum Piezoelectric transducers Impedance Piezoelectric materials Ultrasonic imaging Predictive models Circuits Insertion loss |
| Content Type | Text |
| Resource Type | Article |
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