Next Generation On-Line Ultrasonic Testing System, Using Real-Time Chirp Pulse Compression Processing

Yoshino, Masafumi; Okuno, Ryota; Nagamune, Akio; Nishifuji, Katsuyuki

doi:10.4028/www.scientific.net/msf.210-213.791

Cited by 7 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The chirp signals were pulse-compressed using a matched filter. Moreover, the envelope of the signal was applied before imaging [34]. A logarithmic scale was used to increase the image dynamic.…”

Section: Comparison Of Wave Propagation Of Wave Field Plate With and mentioning

confidence: 99%

Guided Waves for Damage Detection in Complex Composite Structures: The Influence of Omega Stringer and Different Reference Damage Size

et al. 2020

View full text Add to dashboard Cite

The third dataset dedicated to the Open Guided Waves platform aims at carbon fiber composite plates with an additional omega stringer at constant temperature conditions. The two structures used in this work are representative for real aircraft components. Comprehensive measurements were recorded in order to study (I) the impact of the omega stringer on guided wave propagation, and (II) elliptical reference damages of different sizes located at three separate positions on the structure. Measurements were recorded for narrowband excitation (5-cycle toneburst with varying carrier frequencies) and broadband excitation (using chirp waveforms). The paper presents the results of a technical validation including numerical modelling, and enables further research, for example related to probability of detection (POD) analysis.

show abstract

Section: Comparison Of Wave Propagation Of Wave Field Plate With and mentioning

confidence: 99%

Guided Waves for Damage Detection in Complex Composite Structures: The Influence of Omega Stringer and Different Reference Damage Size

et al. 2020

View full text Add to dashboard Cite

show abstract

“…An alternative technique that has been employed to enhance SNR for other ultrasonic applications is to use coded excitations followed by pulse compression 6,7 . The idea is to excite the transmitter with a broadband but long time signal to maximize the excitation energy; suitable signals include various types of chirps, pseudo-random sequences, and white noise.…”

Section: Introductionmentioning

confidence: 99%

Multi-mode and multi-frequency guided wave imaging via chirp excitations

et al. 2011

View full text Add to dashboard Cite

Guided wave imaging has shown great potential for structural health monitoring applications by providing a way to visualize and characterize structural damage. For successful implementation of delay-and-sum and other elliptical imaging algorithms employing guided ultrasonic waves, some degree of mode purity is required because echoes from undesired modes cause imaging artifacts that obscure damage. But it is also desirable to utilize multiple modes because different modes may exhibit increased sensitivity to different types and orientations of defects. The well-known modetuning effect can be employed to use the same PZT transducers for generating and receiving multiple modes by exciting the transducers with narrowband tone bursts at different frequencies. However, this process is inconvenient and timeconsuming, particularly if extensive signal averaging is required to achieve a satisfactory signal-to-noise ratio. In addition, both acquisition time and data storage requirements may be prohibitive if signals from many narrowband tone burst excitations are measured. In this paper, we utilize a chirp excitation to excite PZT transducers over a broad frequency range to acquire multi-modal data with a single transmission, which can significantly reduce both the measurement time and the quantity of data. Each received signal from a chirp excitation is post-processed to obtain multiple signals corresponding to different narrowband frequency ranges. Narrowband signals with the best mode purity and echo shape are selected and then used to generate multiple images of damage in a target structure. The efficacy of the proposed technique is demonstrated experimentally using an aluminum plate instrumented with a spatially distributed array of piezoelectric sensors and with simulated damage.

show abstract

“…Guided wave measurements are frequently performed using low voltage excitations, particularly as compared to typical bulk wave excitations in the hundreds of volts, and extensive signal averaging is often employed to achieve a high signal-to-noise ratio (SNR). For ultrasonic bulk wave testing, an alternative technique to improve SNR is to use coded excitations followed by pulse compression [5,6]. For such an approach the transmitter is excited with a broadband but long time signal such as a chirp, white noise signal, or a pseudo-random sequence.…”

Section: Introductionmentioning

confidence: 99%

Chirp Excitation of Ultrasonic Guided Waves (Preprint)

Michaels¹,

Lee²,

Croxford³

et al. 2011

View full text Add to dashboard Cite

The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number.

show abstract

Next Generation On-Line Ultrasonic Testing System, Using Real-Time Chirp Pulse Compression Processing

Cited by 7 publications

References 0 publications

Guided Waves for Damage Detection in Complex Composite Structures: The Influence of Omega Stringer and Different Reference Damage Size

Guided Waves for Damage Detection in Complex Composite Structures: The Influence of Omega Stringer and Different Reference Damage Size

Multi-mode and multi-frequency guided wave imaging via chirp excitations

Chirp Excitation of Ultrasonic Guided Waves (Preprint)

Contact Info

Product

Resources

About