Into a rapid polymer characterization employing optical measurement systems and high-power ultrasonic excitation

Hasheminejad, Navid; Vanlanduit, Steve; Ghalandari, Taher; Pierron, Fabrice; Vuye, Cedric

doi:10.1016/j.polymer.2024.126730

Cited by 1 publication

(2 citation statements)

References 17 publications

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“…The PMMA sample, sourced from IMATEX N.V. (Schoten, Belgium), was cut to dimensions (4.1 mm in thickness, 11.8 mm in width, and 20.55 mm in length) using a laser cutter. We chose the length based on [ 22 ], adjusting it proportionally according to different frequencies between their experiment and the exciting frequency in ours. In principle, it utilizes Equation ( 2 ), where L represents the sample length, E denotes the modulus of elasticity, and

signifies the material density.…”

Section: Methodsmentioning

confidence: 99%

“…This ensures that the first longitudinal natural frequency ( f ) closely matches the excitation frequency of the plasma probe and ultrasound sensor used in our experiments. Given that the value of E at 51.75 kHz is not available, utilizing the value corresponding to 20 kHz from prior research [ 22 ], rather than relying on datasheet values associated with frequencies near zero, is appropriate.

…”

Section: Methodsmentioning

confidence: 99%

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Exploring the Use of Cold Atmospheric Plasma for Sound and Vibration Generation

Ghaderi,

Hasheminejad,

Dirckx

et al. 2024

Sensors

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In this study, we investigate the potential of cold atmospheric plasma (CAP) as a non-contact excitation device, comparing its performance with an ultrasound transmitter. Utilizing a scanning Laser Doppler Vibrometer (LDV), we visualize the acoustic wavefront generated by a CAP probe and an ultrasound sensor within a designated 50 mm × 50 mm area in front of each probe. Our focus lies in assessing the applicability of a CAP probe for exciting a small polymethyl methacrylate (PMMA) sample. By adjusting the dimensions of the sample to resonate at the excitation frequency of the probe, we can achieve high vibrational velocities, enabling further mechanical analysis. In contrast with traditional vibration excitation techniques such as electrodynamical shakers and hammer impact excitation, a plasma probe can offer distinct advantages without altering the structure’s dynamics since it is contactless. Furthermore, in comparison with laser excitation, plasma excitation provides a higher power level. Additionally, while pressurized air systems are applicable for limited low frequencies, plasma probes can perform at higher frequencies. Our findings in this study suggest that CAP is comparable with acoustic excitation, indicating its potential as an effective mechanical excitation method.

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signifies the material density.…”

Section: Methodsmentioning

confidence: 99%

…”

Section: Methodsmentioning

confidence: 99%