A comb transducer for mode control in guided wave NDE

Rose, Joseph L.; Pelts, S. P.; Quarry, M J

doi:10.1109/ultsym.1997.661757

Cited by 9 publications

(7 citation statements)

References 5 publications

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“…The variable-angle beam transducer and phased arrays are also common. A more sophisticated transducer system for generating guided waves is a "comb" transducer [39]. While contact methods have the advantage of simplicity of operation, their application ranges are limited due to the needing of strict surfaces and coupling fluids.…”

Section: Historical Background 221mentioning

confidence: 99%

Non-Contact Ultrasonic Guided Wave Inspection of Rails: Next Generation Approach

Mariani

Nguyen

Zhu

et al. 2016

2016 Joint Rail Conference

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The University of California at San Diego (UCSD), under a Federal Railroad Administration (FRA) Office of Research and Development (R&D) grant, is developing a system for high-speed and non-contact rail defect detection. A prototype using an ultrasonic air-coupled guided wave signal generation and air-coupled signal detection, paired with a real-time statistical analysis algorithm, has been realized. This system requires a specialized filtering approach based on electrical impedance matching due to the inherently poor signal-to-noise ratio of air-coupled ultrasonic measurements in rail steel. Various aspects of the prototype have been designed with the aid of numerical analyses. In particular, simulations of ultrasonic guided wave propagation in rails have been performed using a Local Interaction Simulation Approach (LISA) algorithm. The system’s operating parameters were selected based on Receiver Operating Characteristic (ROC) curves, which provide a quantitative manner to evaluate different detection performances based on the trade-off between detection rate and false positive rate. The prototype based on this technology was tested in October 2014 at the Transportation Technology Center (TTC) in Pueblo, Colorado, and again in November 2015 after incorporating changes based on lessons learned.

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Section: Historical Background 221mentioning

confidence: 99%

Non-Contact Ultrasonic Guided Wave Inspection of Rails: Next Generation Approach

Mariani

Nguyen

Zhu

et al. 2016

2016 Joint Rail Conference

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“…And even for the same main mode excitation, the frequency is not the same. For the same thickness aluminum plate parts, we can control the main mode by changing the excitation frequency f. Then we can select the best main mode of guided wave to detect curved surface thin plate parts and improve detection sensitivity [7] .…”

Section: ‫ݖ݀‬mentioning

confidence: 99%

Research on guided wave excitation mode control method of comb transducer

Zhou

et al. 2015

2015 IEEE Far East NDT New Technology &Amp; Application Forum (FENDT)

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It is difficult and inefficient to detect curved surface thin plate parts when we adopt conventional ultrasonic testing method. Flexible comb transducer, which can excite certain mode guided wave, can be used for the problem to complete the curved surface micro crack detection rapidly. But because of multiple modes when guided waves propagate in thin plate structure, the propagation law is complex. Considering controlling the excitation guided wave mode in such parts, we can obtain good detection effects. This paper carries out the guided wave mode control research in the process of excitation. We summarize the method to control the guided wave mode, and design the verification experiment by using fixed finger spacing comb transducer to excite the certain mode guided wave in the given thickness aluminum plate.

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“…Rose et al used Sokolinskii type to make guided wave transducer [3], and they obtained good results by adjusting the element interval on the board to stimulate a specific mode of guided wave. Borigo and Koduru et al [4] established a mathematical model for annular comb transducer on board.…”

Section: Introductionmentioning

confidence: 99%

Study on the flexible Rayleigh waves comb transducer with non-equidistant interval based on PZT

HuaMin¹,

He²,

Lv³

2017

Proceedings of the Second International Conference on Mechanics, Materials and Structural Engineering (ICMMSE 2017)

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Abstract. In order to detect the defects of inner and outer surfaces of thick-walled pipes, a Rayleigh waves flexible transducer with non-equal interval comb is designed. Firstly, an optimization design method based on the concept of mutual admittance is proposed, and the amplitude frequency characteristics of Rayleigh waves transducer with equal interval comb are optimized. The influence of the key parameters such as the array element interval, the width of the array element and the number of elements on the waveform and amplitude of the received signal are analyzed by using the finite element method. Based on the analysis of the mutual admittance principle and time frequency analysis, it is determined that the optimal element interval is equal to λ R , the element width is λ R /2, and the elements number is 5. Finally, based on the conclusion of equal interval transducer, the non-equal interval comb transducer is designed to obtain a good Rayleigh wave signal, which provided a good foundation for the practical manufacture and experiment of the transducer.

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A comb transducer for mode control in guided wave NDE

Cited by 9 publications

References 5 publications

Non-Contact Ultrasonic Guided Wave Inspection of Rails: Next Generation Approach

Non-Contact Ultrasonic Guided Wave Inspection of Rails: Next Generation Approach

Research on guided wave excitation mode control method of comb transducer

Study on the flexible Rayleigh waves comb transducer with non-equidistant interval based on PZT

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