A novel technique for the measurement of the acoustic properties of a thin linear-viscoelastic layer using a planar ultrasonic transducer

Bai, Xiaolong; Sun, Zeqing; Chen, Jian; Ju, Bing‐Feng

doi:10.1088/0957-0233/24/12/125602

Cited by 10 publications

(5 citation statements)

References 14 publications

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“…Here, β is the reflection coefficient of acoustic energy at the water-solid interface. Thus A 2 and A i can be expressed in terms of equation (15):…”

Section: Measurement Of Ceramicsmentioning

confidence: 99%

“…The acoustic characteristics of the obstacle can be obtained by analyzing the transition time and amplitude of echo signals [14]. This method exhibits great universality and convenience during measurement, and has been used in the acoustic properties determination of thin linear-viscoelastic layers [15]. Phantom attenuation [16] and shear wave attenuation coefficient [17] have also been measured by a similar contact pulse-echo method.…”

Section: Introductionmentioning

confidence: 99%

“…However, the level of error in determining the attenuation coefficient is still high, due to the insensitivity of ultrasonic echoes at relatively low frequencies. The measurement accuracy of transit time shift is also affected by the pulse width at low frequency [15]. Since the high-frequency sound pulse has a shorter pulse width and more sensitive attenuation characteristics [19], higher frequency transducers are preferred, in order to acquire higher accuracy and lower error in the measurement process.…”

Section: Introductionmentioning

confidence: 99%

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Pulse-echo acoustic properties evaluation method using high-frequency transducer

Li¹,

Han²,

Jian³

et al. 2020

Meas. Sci. Technol.

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The quantitative measurement of acoustic properties is indispensable for many applications. The realization of devices for the evaluation of acoustic properties with higher accuracy and lower error is of great importance. Moreover, the ability to obtain the high-frequency acoustic characteristics of materials is also highly desirable. In this research, the pulse echo method is applied to measure a material’s acoustic parameters, using a miniature transducer with a center frequency of 42.9 MHz. For this method, only one transducer is needed, and the measurement system is simple. Acoustic parameter calculation methods for three types of materials are studied, and the corresponding experiments are conducted. The experimental results show that the sound velocity of water is 1508.8 m s−1, and its attenuation coefficient is 0.981 dB mm−1; the results for liquid paraffin give results of 1386.8 m s−1 and 2.35 dB mm−1, respectively. With reference to polymer materials, thermoplastic polyurethane (TPU) thin film has a sound velocity of 1987.2 m s−1 and an attenuation of 37.1 dB mm−1, and polyimide thin film has a sound velocity of 2142.3 m s−1 and an attenuation of 25 dB mm−1. In terms of ceramics, the sound velocity of PZT-5H 3203HD is 4804.2 m s−1, and its attenuation is 1.71 dB mm−1; 96% alumina ceramic has a sound velocity of 9924.9 m s−1 and its attenuation 1.18 dB mm−1. All results pertaining to sound velocity agree well with those reported in previous works. The measured attenuation coefficients at high frequency are also in good agreement with the experimental data. All experimental results validate the feasibility, effectiveness, convenience, and accuracy of this method.

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“…Here, β is the reflection coefficient of acoustic energy at the water-solid interface. Thus A 2 and A i can be expressed in terms of equation (15):…”

Section: Measurement Of Ceramicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Pulse-echo acoustic properties evaluation method using high-frequency transducer

Li¹,

Han²,

Jian³

et al. 2020

Meas. Sci. Technol.

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“…The viscoelastic characterization of the LEP materials at the appropriate working frequency range is limited for dynamic tests based on the vibration of rods or beams [21,22] and only possible using ultrasonic waves [23][24][25]. Moreover, the use of the ultrasound technique in thin film applications has additional issues as coupled thickness layer determination [26][27][28][29][30]. Alternatively, it is well known for viscoelastic materials, that the frequency (strain rate) and temperature dependencies of polymer properties are both related.…”

Section: Introductionmentioning

confidence: 99%

Top Coating Anti-Erosion Performance Analysis in Wind Turbine Blades Depending on Relative Acoustic Impedance. Part 2: Material Characterization and Rain Erosion Testing Evaluation

Doménech

García-Peñas

Šakalytė³

et al. 2020

Coatings

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Under droplet impingement, surface leading edge protection (LEP) coating materials for wind turbine blades develop high-rate transient pressure build-up and a subsequent relaxation in a range of strain rates. The stress-strain coating LEP behavior at a working frequency range depends on the specific LEP and on the material and operational conditions, as described in this research in a previous work. Wear fatigue failure analysis, based on the Springer model, requires coating and substrate speed of sound measurements as constant input material parameters. It considers a linear elastic response of the polymer subjected to drop impact loads, but does not account for the frequency dependent viscoelastic effects for the materials involved. The model has been widely used and validated in the literature for different liquid impact erosion problems. In this work, it is shown the appropriate definition of the viscoelastic materials properties with ultrasonic techniques. It is broadly used for developing precise measurements of the speed of sound in thin coatings and laminates. It also allows accurately evaluating elastic moduli and assessing mechanical properties at the high frequencies of interest. In the current work, an investigation into various LEP coating application cases have been undertaken and related with the rain erosion durability factors due to suitable material impedance definition. The proposed numerical procedures to predict wear surface erosion have been evaluated in comparison with the rain erosion testing, in order to identify suitable coating and composite substrate combinations. LEP erosion performance at rain erosion testing (RET) technique is used widely in the wind industry as the key metric, in an effort to assess the response of the varying material and operational parameters involved.

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“…The scanning probe method and the areal imaging method are two main measuring approaches in surface profile measurement of aspheric and freeform surfaces [1][2][3]. Compared with areal imaging method such as white light interferometry [4], the scanning probe method such as atomic force microscope (AFM) [5], scanning tunnelling microscope (STM) [3,6], optical focused probe [7,8] and ultrasonic probe [9], is more flexible and easier for integration with the machine tools for on-machine measurement since their measuring head/probe can be always designed to be in a compact size. However, the scanning probe method, which is conventionally operated in a raster scanning type, has a shortcoming of low measurement efficiency.…”

Section: Introductionmentioning

confidence: 99%

A new centering method of the measuring probe for spiral scanning-based surface profile measurement systems

Zeng

et al. 2016

Meas. Sci. Technol.

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Spiral scanning is a high-efficiency scanning mode for surface profile measurement systems. The most important priority to realize the spiral scanning mode is to accurately align the measuring probe with the rotational centre of the spindle. This paper proposes a novel centre alignment method of the measuring probe, which is considered to be suitable for any type of spiral scanning surface measurement systems. The proposed method, which only needs a tilted flat mirror as the artefact, makes the time-consuming centre alignment process of the measuring probe become much easier and faster. The operational steps of the proposed method are presented. Experiments have also been carried out based on a self-developed optical profiler with spiral scanning operation to verity the feasibility of the proposed method. The experimental results show that the proposed method is capable of conducting a fast alignment (only takes 3 min) while maintaining a high alignment accuracy. Evaluation of the alignment accuracy shows that the centering error is less than 10 µm on the mechanical guide rail stage and about 1.7 µm on the air-bearing stage.

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A novel technique for the measurement of the acoustic properties of a thin linear-viscoelastic layer using a planar ultrasonic transducer

Cited by 10 publications

References 14 publications

Pulse-echo acoustic properties evaluation method using high-frequency transducer

Pulse-echo acoustic properties evaluation method using high-frequency transducer

Top Coating Anti-Erosion Performance Analysis in Wind Turbine Blades Depending on Relative Acoustic Impedance. Part 2: Material Characterization and Rain Erosion Testing Evaluation

A new centering method of the measuring probe for spiral scanning-based surface profile measurement systems

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