Strain distribution in rabbit eardrums under static pressure

Gladiné, Kilian; Dirckx, Joris J.J.

doi:10.1016/j.heares.2019.107772

Cited by 8 publications

(6 citation statements)

References 25 publications

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“…Most of the steps used in this work are based on established procedures (Gladiné and Dirckx, 2019;Livens et al, 2021b;Pires et al, 2021). However, we have made one novel change.…”

Section: Methodsmentioning

confidence: 99%

Measuring the motion of the eardrum using Digital Image Correlation

Livens,

Ukshini,

Dirckx

2024

J. Phys.: Conf. Ser.

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The human eardrum is a translucent curved membrane and is in direct contact with the middle ear bones. Studying this complicated biomechanical system remains challenging. Digital image correlation (DIC) is an optical technique that allows measuring the shape and displacement of curved surfaces in 3D. In this work, we discuss the advantages and disadvantages of using DIC to study the eardrum at frequencies around 1 kHz. Special attention is given to the application of speckle patterns required to perform DIC on the translucent eardrum. Additionally, we detail an alternative approach to high-speed cameras: phase-locked light pulses. Using light pulses synced to the phase of the sound, regular DIC cameras can be used at their full resolution. This enables a high spatial resolution to thoroughly investigate the motion of the eardrum at the relevant frequencies.

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“…Most of the steps used in this work are based on established procedures (Gladiné and Dirckx, 2019;Livens et al, 2021b;Pires et al, 2021). However, we have made one novel change.…”

Section: Methodsmentioning

confidence: 99%

Measuring the motion of the eardrum using Digital Image Correlation

Livens,

Ukshini,

Dirckx

2024

J. Phys.: Conf. Ser.

Self Cite

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“…These are addressed next: 698 1. Dynamic measurements of the tympanic membrane 699 via the DIC technique: The stochastic fluorescent 700 speckle pattern on the TM's surface has proved a feasi-701 ble approach in other studies [31,36], so both the shape 702 and displacements could be measured. On the other 703 hand, displacement measurements with relatively high 704 signal-to-noise ratios were only acquired at high SPLs.…”

Section: Estimation Of Materials Properties 621mentioning

confidence: 99%

“…The lateral surface of the TM is smooth and lacks con-470 trast variations, features that impede proper measurements 471 via the DIC. To overcome this issue, a stochastic intensity 472 pattern was artificially created by following the strategy of 473 [31]. The approach of [31] consists on spraying a mixture of 474 ethanol and a fluorescent powder over the lateral surface of 475 the TM.…”

mentioning

confidence: 99%

“…To overcome this issue, a stochastic intensity 472 pattern was artificially created by following the strategy of 473 [31]. The approach of [31] consists on spraying a mixture of 474 ethanol and a fluorescent powder over the lateral surface of 475 the TM. Since the ethanol will evaporate, only the fluores-476 cent dye will remain on the TM.…”

mentioning

confidence: 99%

“…To overcome the issue of recording a sample with such small dimensions, tubes between the cameras and their respective lenses were installed in order to amplify the images and improve the fieldof-view. Commercially available DIC software (ISTRA 4D 4.4.7, Dantec Dynamics, Skovlunde, Denmark) was used to record the displacements.In this work, the suggestions of[31] related to the object's illumination and image recording were also mimicked. The TM was illuminated with a doubled YAG 532 nm green laser beam (CNI, MSL-FN-532-200mW, Changchung, China).…”

mentioning

confidence: 99%

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Material Identification on Thin Shells Using the Virtual Fields Method, Demonstrated on the Human Eardrum

Pires

Avril

Livens

et al. 2021

Journal of Biomechanical Engineering

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Characterization of material parameters from experimental data remains challenging, especially on biological structures. One of such techniques allowing for the inverse determination of material parameters from measurement data is the Virtual Fields Method (VFM). However, application of the VFM on general structures of complicated shape has not yet been extensively investigated. In this paper, we extend the framework of the VFM method to thin curved solids in 3D, commonly denoted shells. Our method is then used to estimate theYoung's modulus and hysteretic damping of the human eardrum. By utilizing Kirchhoff plate theory, we assume that the behavior of the shell varies linearly through the thickness. The total strain of the shell can then be separated in a bending and membrane strain. This in turn allowed for an application of the VFM based only on data of the outer surface of the shell. We validated our method on simulated and experimental data of a human eardrum made to vibrate at certain frequencies. It was shown that the identified material properties were accurately determined based only on data from the outer surface and are in agreement with literature. Additionally, we observed that neither the bending nor the membrane strain in an human eardrum can be neglected and both contribute significantly to the total strain found experimentally.

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