A Comparison of Three Techniques to Determine the Nonlinear Ultrasonic Parameter β

Hurley, Donna C.; Yost, William T.; Boltz, E. S.; Fortunko, C. M.

doi:10.1007/978-1-4615-5947-4_180

Cited by 8 publications

(4 citation statements)

References 9 publications

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“…Finally, it was validated that the absolute values of the acoustic nonlinearity parameters of fused silica and aluminum alloy measured by the proposed calibration method using the piezo-electric transducer were similar to reference values of previous studies that used a capacitive transducer [1,21,22]. In later studies, Hurley et al showed that measurement of the absolute nonlinearity parameter of fused silica by a piezo-electric transducer-based on the above calibration method was comparable to measurement by not only capacitive detection but also laser interferometer detection [23,24]. Nonlinearity parameters measured by each method had similar values, so it can be concluded that the nonlinearity parameter measurement using the piezo-electric transducer calibration method is reliable.…”

Section: Introductionsupporting

confidence: 78%

“…Nonlinearity parameters measured by each method had similar values, so it can be concluded that the nonlinearity parameter measurement using the piezo-electric transducer calibration method is reliable. However, for calibration, displacement conversion in the capacitive and laser interferometer detections can be completed with a simple linear relational equation, but there is an obvious difference that the additional experiment is required in the piezo-electric method [24]. Therefore, although the piezo-electric detection method is reliable, the piezoelectric calibration procedure in the piezo-electric method can be tedious and time-consuming.…”

Section: Introductionmentioning

confidence: 99%

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Calibration method using a narrowband signal for measurement of the acoustic nonlinearity parameter

Song

Park

Yoo

et al. 2023

Preprint

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The measurement of absolute acoustic nonlinearity parameters using piezoelectric transducers consists of two steps; calibration and harmonic detection. In calibration, a frequency domain transfer function that converts the current output signal amplitude into the acoustic displacement amplitude is measured. Then, in harmonic detection, the amplitudes of the harmonics generated in the ultrasonic waves propagating through a medium are detected and converted to displacement amplitudes using the transfer function obtained in the calibration step for calculation of the acoustic nonlinearity parameters. However, in the conventional method, a broadband pulse signal is used for the calibration and a narrowband tone-burst signal is used for the harmonic detection; therefore, this method inconveniently uses different driving devices for calibration and harmonic detection. In this study, we propose a more convenient technique that can perform calibration using a narrowband signal so that a single driver of a narrowband signal can be used for both calibration and harmonic detection. To verify the validity of the proposed method, transfer functions were measured at typical frequencies for two types of material (aluminum alloy and fused silica) against two types of transducers (commercial PZT and LiNbO3 crystal), and the results were compared with those obtained using conventional calibration method. The transfer functions obtained by the conventional method and the proposed method showed good concordance, independent of material and transducer type.

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Section: Introductionsupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Calibration method using a narrowband signal for measurement of the acoustic nonlinearity parameter

Song

Park

Yoo

et al. 2023

Preprint

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“…The measurement results for the copper and Al6061-T6 specimens indicated a high correlation with the y = x function, within 10% deviation, demonstrating the capability of the absolute ultrasonic displacement amplitude of the photorefractive interferometer, even on a rough surface. Note that a deviation of about 10% is an acceptable level in consideration of the experimental environment or the effect of surface roughness of the specimen [26]. The displacement amplitudes of the fundamental ( ) and second-order harmonic ( ) components were extracted in the frequency domain.…”

Section: Laser-ultrasonic Detection Resultsmentioning

confidence: 99%

“…To address these issues, studies have reported the use of noncontact detection methods such as capacitive [25] and laser detection methods [26] to measure β. Yost et al [25] used a capacitive receiver, which measures the change in capacitance between one side of a specimen and the receiver to measure β for the aluminum alloy specimens. Hurley et al [26] used a Michelson-type laser interferometer to measure β, which is a well-known method that provides a direct means of absolute displacement amplitudes. These methods can be applied without couplant and special shoes.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Absolute Acoustic Nonlinearity Parameter Using Laser-Ultrasonic Detection

et al. 2021

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The absolute acoustic nonlinearity parameter β is defined by the displacement amplitudes of the fundamental and second-order harmonic frequency components of the ultrasonic wave propagating through the material. As β is a sensitive index for the micro-damage interior of industrial components at early stages, its measurement methods have been actively investigated. This study proposes a laser-ultrasonic detection method to measure β. This method provides (1) the β measurement in a noncontact and nondestructive manner, (2) inspection ability of different materials without complex calibration owing to direct ultrasonic displacement detection, and (3) applicability for the general milling machined surfaces of components owing to the use of a laser interferometer based on two-wave mixing in the photorefractive crystal. The performance of the proposed method is validated using copper and 6061 aluminum alloy specimens with sub-micrometer surface roughness. The experimental results demonstrated that the β values measured by the proposed method for the two specimens were consistent with those obtained by the conventional piezoelectric detection method and the range of previously published values.

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Non-destructive testing

Stumm¹,

広島²

1975

Non-Destructive Testing

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A Comparison of Three Techniques to Determine the Nonlinear Ultrasonic Parameter β

Cited by 8 publications

References 9 publications

Calibration method using a narrowband signal for measurement of the acoustic nonlinearity parameter

Calibration method using a narrowband signal for measurement of the acoustic nonlinearity parameter

Measurement of Absolute Acoustic Nonlinearity Parameter Using Laser-Ultrasonic Detection

Non-destructive testing

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