Guided wave phased array beamforming and imaging in composite plates

Yu, Lingyu; Tian, Zhenhua

doi:10.1016/j.ultras.2016.02.001

Cited by 77 publications

(44 citation statements)

References 67 publications

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“…Real‐time steering of acoustic waves is one of the key functions required for acoustic imaging in medical diagnostics as well as quantitative damage inspection in nondestructive evaluation . By gradually steering acoustic waves to different directions like a radar, a scanning image can be generated for diagnosis.…”

Section: Resultsmentioning

confidence: 99%

“…Acoustic beams, such as focused, tweezer‐like, and nonparaxial beams, are of interest for a wide range of applications including medical acoustic imaging, nondestructive evaluation, acoustic tweezers, energy harvesting, and wireless energy transfer . Although acoustic beams can be generated using conventional passive metasurfaces, those metasurfaces with fixed configurations lack maneuverability in tuning and reshaping the acoustic beams, once they are designed and fabricated.…”

Section: Resultsmentioning

confidence: 99%

“…The two functions, beamforming and beamsteering, demonstrated here will benefit multiple areas including acoustic imaging, energy harvesting, and wireless power transfer. For example, a focused beam with high energy confined in a narrow region will significantly improve the signal‐to‐noise ratio and resolution of acoustic imaging …”

Section: Resultsmentioning

confidence: 99%

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Programmable Acoustic Metasurfaces

Tian

Shen

et al. 2019

Adv Funct Materials

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146

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Metasurfaces open up unprecedented potential for wave engineering using subwavelength sheets. However, a severe limitation of current acoustic metasurfaces is their poor reconfigurability to achieve distinct functions on demand. Here a programmable acoustic metasurface that contains an array of tunable subwavelength unit cells to break the limitation and realize versatile two-dimensional wave manipulation functions is reported. Each unit cell of the metasurface is composed of a straight channel and five shunted Helmholtz resonators, whose effective mass can be tuned by a robust fluidic system. The phase and amplitude of acoustic waves transmitting through each unit cell can be modulated dynamically and continuously. Based on such mechanism, the metasurface is able to achieve versatile wave manipulation functions, by engineering the phase and amplitude of transmission waves in the subwavelength scale. Through acoustic field scanning experiments, multiple wave manipulation functions, including steering acoustic waves, engineering acoustic beams, and switching on/off acoustic energy flow by using one design of metasurface are visually demonstrated. This work extends the metasurface research and holds great potential for a wide range of applications including acoustic imaging, communication, levitation, and tweezers.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Programmable Acoustic Metasurfaces

Tian

Shen

et al. 2019

Adv Funct Materials

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146

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“…Considering that a single-frequency Lamb wave is generated from a source at the coordinate origin in a composite plate, the wave arriving at the location x that is away from the source can be expressed as [22],

u (t, x) = A e^{j (ω t - k \cdot x)} = A e^{j [ω t - k (γ) x \cos β]},

where A is the amplitude, x is the norm of x , β is the angle between the wave propagation, and wavenumber k , and γ is the angle of the wavenumber vector k .…”

Section: Lamb Waves In a Composite Platementioning

confidence: 99%

A Modified Lamb Wave Time-Reversal Method for Health Monitoring of Composite Structures

Zeng

Lin

Huang

2017

Sensors

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Because the time reversal operator of Lamb waves varies with frequency in composite structures, the reconstructed signal deviates from the input signal even in undamaged cases. The damage index captures the discrepancy between the two signals without differentiating the effects of time reversal operator from those of damage. This results in the risk of false alarm. To solve this issue, a modified time reversal method (MTRM) is proposed. In this method, the frequency dependence of the time reversal operator is compensated by two steps. First, an amplitude modulation is placed on the input signal, which is related to the excitability, detectability, and attenuation of the Lamb wave mode. Second, the damage index is redefined to measure the deviation between the reconstructed signal and the modulated input signal. This could indicate the presence of damage with better performance. An experimental investigation is then conducted on a carbon fiber-reinforced polymer (CFRP) laminate to illustrate the effectiveness of the MTRM for identifying damage. The results show that the MTRM may provide a promising tool for health monitoring of composite structures.

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“…Using the frequency spectrum V m (f) of each array element, we derive a synthesized frequency-space representation Z(f, x) of the array [49,50]:…”

Section: -3mentioning

confidence: 99%

Multi-site delamination detection and quantification in composites through guided wave based global-local sensing

Tian¹,

Leckey²,

Yu³

2017

AIP Conference Proceedings

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Abstract. This paper presents a guided wave based global-local sensing method for rapid detection and quantification of multi-site delamination damage in large composite panels. The global-local approach uses a hybrid system consisting of a piezoelectric transducer (PZT) for generating guided waves and a non-contact scanning laser Doppler vibrometer (SLDV) for acquiring guided wave data. The global-local method is performed in two steps. First, a phased array configured of a small number of SLDV scan points (for example 10×10 points in a rectangular grid array) performs inspection over the entire plate to detect and locate damage. Local areas are identified as potential damage regions for the second step. Then high density wavefield measurements are taken over the identified areas and wavefield analysis is performed to quantitatively evaluate the damage. For the proof of concept in case with multi-site damage, the global-local approach is demonstrated on a carbon fiber reinforced polymer (CFRP) composite plate with two sites of impact-induced delamination damage. In the first step, the locations of two delamination sites are detected by the phased array method. In the second step, the delamination size and shape are evaluated using wavefield analysis. The detected delamination location, size and shape agree well with those of ultrasonic C-scan and the method led to a 93% reduction in inspection time compared to a full SLDV dense grid scan.

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Guided wave phased array beamforming and imaging in composite plates

Cited by 77 publications

References 67 publications

Programmable Acoustic Metasurfaces

Programmable Acoustic Metasurfaces

A Modified Lamb Wave Time-Reversal Method for Health Monitoring of Composite Structures

Multi-site delamination detection and quantification in composites through guided wave based global-local sensing

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