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2014 ; 19
(9
): 96001
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Full-field transient vibrometry of the human tympanic membrane by local phase
correlation and high-speed holography
#MMPMID25191832
Dobrev I
; Furlong C
; Cheng JT
; Rosowski JJ
J Biomed Opt
2014[Sep]; 19
(9
): 96001
PMID25191832
show ga
Understanding the human hearing process would be helped by quantification of the
transient mechanical response of the human ear, including the human tympanic
membrane (TM or eardrum). We propose a new hybrid high-speed holographic system
(HHS) for acquisition and quantification of the full-field nanometer transient
(i.e., >10 kHz) displacement of the human TM. We have optimized and implemented a
2 þ 1 frame local correlation (LC) based phase sampling method in combination
with a high-speed (i.e., >40 K fps) camera acquisition system. To our knowledge,
there is currently no existing system that provides such capabilities for the
study of the human TM. The LC sampling method has a displacement difference of
<11 nm relative to measurements obtained by a four-phase step algorithm.
Comparisons between our high-speed acquisition system and a laser Doppler
vibrometer indicate differences of <10 ?s. The high temporal (i.e., >40 kHz) and
spatial (i.e., >100 k data points) resolution of our HHS enables parallel
measurements of all points on the surface of the TM, which allows quantification
of spatially dependent motion parameters, such as modal frequencies and acoustic
delays. Such capabilities could allow inferring local material properties across
the surface of the TM.