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

I. Dobrev; E. J. Harrington; T. Cheng; C. Furlong; J. J. Rosowski

doi:10.1117/12.2063523

18 August 2014 High-speed holographic system for full-field transient vibrometry of the human tympanic membrane

I. Dobrev, E. J. Harrington, T. Cheng, C. Furlong, J. J. Rosowski

Author Affiliations +

Proceedings Volume 9204, Interferometry XVII: Advanced Applications; 920405 (2014) https://doi.org/10.1117/12.2063523
Event: SPIE Optical Engineering + Applications, 2014, San Diego, California, United States

Abstract

Understanding of the human hearing process requires the quantification of the transient response of the human ear and the human tympanic membrane (TM or eardrum) in particular. Current state-of-the-art medical methods to quantify the transient acousto-mechanical response of the TM provide only averaged acoustic or local information at a few points. This may be insufficient to fully describe the complex patterns unfolding across the full surface of the TM. Existing engineering systems for full-field nanometer measurements of transient events, typically based on holographic methods, constrain the maximum sampling speed and/or require complex experimental setups. We have developed and implemented of a new high-speed (i.e., > 40 Kfps) holographic system (HHS) with a hybrid spatio-temporal local correlation phase sampling method that allows quantification of the full-field nanometer transient (i.e., > 10 kHz) displacement of the human TM. The HHS temporal accuracy and resolution is validated versus a LDV on both artificial membranes and human TMs. The high temporal (i.e., < 24 μs) and spatial (i.e., >100k data points) resolution of our HHS enables simultaneous measurement of the time waveform of the full surface of the TM. These capabilities allow for quantification of spatially-dependent motion parameters such as energy propagation delays surface wave speeds, which can be used to infer local material properties across the surface of the TM. The HHS could provide a new tool for the investigation of the auditory system with applications in medical research, in-vivo clinical diagnosis as well as hearing aids design.

Citation Download Citation

I. Dobrev, E. J. Harrington, T. Cheng, C. Furlong, and J. J. Rosowski "High-speed holographic system for full-field transient vibrometry of the human tympanic membrane", Proc. SPIE 9204, Interferometry XVII: Advanced Applications, 920405 (18 August 2014); https://doi.org/10.1117/12.2063523

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KEYWORDS

Holography

Wave propagation

Cameras

Ear

Acoustics

Ferroelectric materials

Spatial resolution

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