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Asian Journal of Physics Vol. 30 Nos 10 & 11 (2021) 1447-1455

Digital stroboscopic holography and digital image correlation in tympanic membrane measurement: a comparative study
P G G Muyshondt, P Livens and J J J Dirckx

Abstract

Over the years, different optical measurement techniques have been developed to measure the vibration behavior of the tympanic membrane to gain insight into its acoustic functioning. In this study, digital stroboscopic holography and digital image correlation are used to measure full-field dynamic motion of the rabbit and human tympanic membrane under harmonic pressure variations. Full-field out-of-plane displacement magnitudes and phases of the membrane are depicted as a function of time, and the strengths and weaknesses of both the techniques are discussed. With the digital stroboscopic holography system, full-field time-resolved vibration measurements can be obtained with nanometer-scale precision in a frequency range from low quasi-static to acoustic frequencies (20 – 20,000 Hz). With the digital image correlation system, similar measurements can be done, but the intrinsic resolution of the holography setup discussed here is a factor 10 better. Additionally, the frequencies which can be measured using image correlation are lower, up to 1200 Hz, due to the fast drop off in vibration amplitude at higher frequencies. However, the range of displacements which can be measured using image correlation is much larger. While the upper bound for displacement measurement with holography is 5 µm, digital image correlation allows to measure displacements in the order of millimeters. When low amplitude displacements at high frequencies are to be investigated, holography is the better choice. If the vibration amplitudes are large and the frequency relatively low, image correlation is the better metrological approach. © Anita Publications. All rights reserved.
Keywords: Digital stroboscopic holography, Digital image correlation, Tympanic membrane.

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