High-speed holographic system for full-field transient vibrometry of the human tympanic membrane

2014 ◽  
Author(s):  
I. Dobrev ◽  
E. J. Harrington ◽  
T. Cheng ◽  
C. Furlong ◽  
J. J. Rosowski
Keyword(s):  
Tympanic Membrane ◽  
High Speed ◽  
Full Field ◽  
Human Tympanic Membrane

scholarly journals Full-Field Thickness Distribution of Human Tympanic Membrane Obtained with Optical Coherence Tomography

2013 ◽  
Vol 14 (4) ◽  
pp. 483-494 ◽  
Author(s):  
Sam Van der Jeught ◽  
Joris J. J. Dirckx ◽  
Johan R. M. Aerts ◽  
Adrian Bradu ◽  
Adrian Gh Podoleanu ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Tympanic Membrane ◽  
Thickness Distribution ◽  
Optical Coherence ◽  
Full Field ◽  
Human Tympanic Membrane

scholarly journals Combined high-speed holographic shape and full-field displacement measurements of tympanic membrane

2018 ◽  
Vol 24 (03) ◽  
pp. 1 ◽  
Author(s):  
Payam Razavi ◽  
Haimi Tang ◽  
John J. Rosowski ◽  
Cosme Furlong ◽  
Jeffrey T. Cheng
Keyword(s):  
Tympanic Membrane ◽  
High Speed ◽  
Full Field ◽  
Field Displacement ◽  
Displacement Measurements

scholarly journals High-Speed Holographic Shape and Full-Field Displacement Measurements of the Tympanic Membrane in Normal and Experimentally Simulated Pathological Ears

2019 ◽  
Vol 9 (14) ◽  
pp. 2809 ◽  
Author(s):  
Haimi Tang ◽  
Payam Razavi ◽  
Koohyar Pooladvand ◽  
Pavel Psota ◽  
Nima Maftoon ◽  
...  
Keyword(s):  
Tympanic Membrane ◽  
Middle Ear ◽  
High Speed ◽  
Sound Pressure ◽  
Motion Pattern ◽  
Motion Patterns ◽  
Full Field ◽  
Field Displacement ◽  
Frequency Domains ◽  
Before And After

To improve the understanding of the middle-ear hearing mechanism and assist in the diagnosis of middle-ear diseases, we are developing a high-speed digital holographic (HDH) system to measure the shape and acoustically-induced transient displacements of the tympanic membrane (TM). In this paper, we performed measurements on cadaveric human ears with simulated common middle-ear pathologies. The frequency response function (FRF) of the normalized displacement by the stimulus (sound pressure) at each measured pixel point of the entire TM surface was calculated and the complex modal indicator function (CMIF) of the middle-ear system based on FRFs of the entire TM surface motions was used to differentiate different middle-ear pathologies. We also observed changes in the TM shape and the surface motion pattern before and after various middle-ear manipulations. The observations of distinguishable TM shapes and motion patterns in both time and frequency domains between normal and experimentally simulated pathological ears support the development of a quantitative clinical holography-based apparatus for diagnosing middle-ear pathologies.

scholarly journals Full-Field Operational Modal Analysis of an Aircraft Composite Panel from the Dynamic Response in Multi-Impact Test

Sensors ◽  
2021 ◽  
Vol 21 (5) ◽  
pp. 1602
Author(s):  
Ángel Molina-Viedma ◽  
Elías López-Alba ◽  
Luis Felipe-Sesé ◽  
Francisco Díaz
Keyword(s):  
Modal Analysis ◽  
Energy Absorption ◽  
High Speed ◽  
Operational Modal Analysis ◽  
Modal Identification ◽  
Image Correlation ◽  
Composite Panel ◽  
Impact Excitation ◽  
Full Field ◽  
The Impact

Experimental characterization and validation of skin components in aircraft entails multiple evaluations (structural, aerodynamic, acoustic, etc.) and expensive campaigns. They require different rigs and equipment to perform the necessary tests. Two of the main dynamic characterizations include the energy absorption under impact forcing and the identification of modal parameters through the vibration response under any broadband excitation, which also includes impacts. This work exploits the response of a stiffened aircraft composite panel submitted to a multi-impact excitation, which is intended for impact and energy absorption analysis. Based on the high stiffness of composite materials, the study worked under the assumption that the global response to the multi-impact excitation is linear with small strains, neglecting the nonlinear behavior produced by local damage generation. Then, modal identification could be performed. The vibration after the impact was measured by high-speed 3D digital image correlation and employed for full-field operational modal analysis. Multiple modes were characterized in a wide spectrum, exploiting the advantages of the full-field noninvasive techniques. These results described a consistent modal behavior of the panel along with good indicators of mode separation given by the auto modal assurance criterion (Auto-MAC). Hence, it illustrates the possibility of performing these dynamic characterizations in a single test, offering additional information while reducing time and investment during the validation of these structures.

scholarly journals Experimental study of the dynamic behaviour of High Performance Concrete (HPC) under tensile loading

2018 ◽  
Vol 183 ◽  
pp. 02043 ◽  
Author(s):  
Bratislav Lukić ◽  
Dominique Saletti ◽  
Pascal Forquin
Keyword(s):  
High Speed ◽  
High Performance ◽  
High Performance Concrete ◽  
Imaging System ◽  
Spall Strength ◽  
High Speed Imaging ◽  
Dynamic Tensile Strength ◽  
Full Field ◽  
Local Point ◽  
Measurement Results

This paper presents the measurement results of the dynamic tensile strength of a High Performance Concrete (HPC) obtained using full-field identification method. An ultra-high speed imaging system and the virtual fields method were used to obtain this information. Furthermore the measurement results were compared with the local point-wise measurement to validate the data pressing. The obtained spall strength was found to be consistently 20% lower than the one obtained when the Novikov formula is used.

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