A comb transducer for guided wave generation and mode selection

Pelts, S. P.; Jiao, D.; Rose, Joseph L.

doi:10.1109/ultsym.1996.584128

Cited by 14 publications

(8 citation statements)

References 3 publications

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“…4) In the process of using comb transducer to detect thin plate parts, first confirm the excitation frequency f is the main mode according to K=s/d , then by sending the different single frequency tone burst to comb transducer, every main mode guided wave can be excited. And then by comparing the amplitude of all main mode, we select the best main mode guided wave to improve the efficiency.…”

Section: Resultsmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

“…But guided wave has multiple modes in curved surface thin plate parts, we can only find the certain mode guided wave to accomplish effective detection. Therefore, we need to learn the method to control the guided wave mode excited by comb transducer [3] [4] . This paper implements the theoretical and experimental research for this method.…”

Section: Introductionmentioning

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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“…As mentioned in the introductory section, GW testing is quite common in the NDE industry. The most commonly used transducers are angled piezoelectric wedge transducers (Zhu et al, 1998;Wilcox et al, 2001), comb transducers (Pelts et al, 1996) and electromagnetic acoustic transducers (EMATs; Alers and Burns, 1987). Other options that have been explored in recent years for NDE are Hertzian contact transducers (Degerketin and Khuri-Yakub, 1996) and lasers (Pierce and Culshaw, 1998).…”

Section: Transducer Technologymentioning

confidence: 99%

The Shock and Vibration Digest

Pusey¹,

Schell²,

Volin³

et al. 1974

The Shock and Vibration Digest

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“…In guided wave non‐destructive evaluation, the most commonly used transducers are wedge transducers, 6 comb transducers 7 and electromagnetic acoustic transducers (EMATs) 8 . While these types of transducers function well for maintenance inspection when the structure is offline for service, they are not compact enough to be permanently installed on the structure during its operation as required for in situ SHM.…”

Section: Introductionmentioning

confidence: 99%

Piezoelectric wafer active sensors for in situ ultrasonic‐guided wave SHM

Santoni

et al. 2008

Fatigue Fract Eng Mat Struct

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A B S T R A C T In situ structural health monitoring aims to perform on-demand interrogation of the structure to determine the presence of service-induced damage and defects using nondestructive evaluation ultrasonic wave methods. Recently emerged piezoelectric wafer active sensors (PWAS) have the potential to significantly improve damage detection and health monitoring. PWAS are low-profile transducers that can be permanently attached onto the structure or inserted in between composite laminates, and can perform structural damage detection in thin-wall structures using guided wave methods (Lamb, Rayleigh, SH, etc.). This paper describes the analytical and experimental work of using PWAS-guided waves for in situ structural damage detection on thin-wall structures. We begin with reviewing the guided wave theory in plate structures and PWAS principles. The mechanisms of Lamb wave excitation and detection using PWAS is presented. Subsequently, we address in turn the use of PWAS to generate Lamb waves for damage (cracks and corrosion) detection in metallic structures. Pulse-echo, pitch-catch, phased array and time reversal methods are illustrated demonstrating that PWAS Lamb-waves techniques are suitable for damage detection and structural health monitoring. The last part of the paper treats analytically and experimentally PWAS excitation and tuning in composite materials. The research results presented in this paper show that in situ SHM methodologies using PWAS transducers hold the promise for more efficient, effective and timely damage detection in thin-wall structures.

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A comb transducer for guided wave generation and mode selection

Cited by 14 publications

References 3 publications

Research on guided wave excitation mode control method of comb transducer

Research on guided wave excitation mode control method of comb transducer

The Shock and Vibration Digest

Piezoelectric wafer active sensors for in situ ultrasonic‐guided wave SHM

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