Open AccessMultiple angle digital holography for the shape measurement of the unpainted tympanic membrane
Author(s) -
Pavel Psota,
Haimi Tang,
Koohyar Pooladvand,
Cosme Furlong,
John J. Rosowski,
Jeffrey Cheng,
Vít Lédl
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.398919
Subject(s) - optics , holography , laser , materials science , wavelength , digital holography , measure (data warehouse) , physics , computer science , database
The shape of the tympanic membrane (TM) plays an important role in sound transmission through the ear for hearing. Previously we developed a high-speed holographic system employing a tunable wavelength laser for rapid TM shape measurement. However, the tunable laser illumination was not sufficient to measure the shape of the unpainted TM due to the semi-transparency of the TM and short exposure time of the camera. This paper presents a new multiple angle illumination technique that allows us to use a higher power single wavelength laser to perform shape measurements on the unpainted TM. Accuracy of the new method is demonstrated by a measure of a step gauge provided by the National Institute of Standards and Technology. We successfully applied the new shape measurement method on a fresh postmortem human TM without any paint.