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Holographic otoscope for nano-displacement measurements of surfaces under dynamic excitation

Identifieur interne : 001177 ( Pmc/Curation ); précédent : 001176; suivant : 001178

Holographic otoscope for nano-displacement measurements of surfaces under dynamic excitation

Auteurs : J. M. Flores-Moreno [États-Unis, Mexique] ; Cosme Furlong [États-Unis] ; John J. Rosowski [États-Unis] ; Ellery Harrington [États-Unis] ; Jeffrey T. Cheng [États-Unis] ; C. Scarpino [États-Unis] ; F. Mendoza Santoyo [Mexique]

Source :

RBID : PMC:3193549

Abstract

Summary

We describe a novel holographic otoscope system for measuring nano-displacements of objects subjected to dynamic excitation. Such measurements are necessary to quantify the mechanical deformation of surfaces in mechanics, acoustics, electronics, biology and many other fields. In particular, we are interested in measuring the sound-induced motion of biological samples, such as an eardrum. Our holographic otoscope system consists of laser illumination delivery (IS), optical head (OH), and image processing computer (IP) systems. The IS delivers the object beam (OB) and the reference beam (RB) to the OH. The backscattered light coming from the object illuminated by the OB interferes with the RB at the camera sensor plane to be digitally recorded as a hologram. The hologram is processed by the IP using Fresnel numerical reconstruction algorithm, where the focal plane can be selected freely. Our holographic otoscope system is currently deployed in a clinic, and is packaged in a custom design. It is mounted in a mechatronic positioning system to increase its maneuverability degrees to be conveniently positioned in front of the object to be measured. We present representative results highlighting the versatility of our system to measure deformations of complex elastic surfaces in the wavelength scale including a copper foil membrane and postmortem tympanic membrane (TM).


Url:
DOI: 10.1002/sca.20283
PubMed: 21898459
PubMed Central: 3193549

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PMC:3193549

Le document en format XML

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<p id="P1">We describe a novel holographic otoscope system for measuring nano-displacements of objects subjected to dynamic excitation. Such measurements are necessary to quantify the mechanical deformation of surfaces in mechanics, acoustics, electronics, biology and many other fields. In particular, we are interested in measuring the sound-induced motion of biological samples, such as an eardrum. Our holographic otoscope system consists of laser illumination delivery (IS), optical head (OH), and image processing computer (IP) systems. The IS delivers the object beam (OB) and the reference beam (RB) to the OH. The backscattered light coming from the object illuminated by the OB interferes with the RB at the camera sensor plane to be digitally recorded as a hologram. The hologram is processed by the IP using Fresnel numerical reconstruction algorithm, where the focal plane can be selected freely. Our holographic otoscope system is currently deployed in a clinic, and is packaged in a custom design. It is mounted in a mechatronic positioning system to increase its maneuverability degrees to be conveniently positioned in front of the object to be measured. We present representative results highlighting the versatility of our system to measure deformations of complex elastic surfaces in the wavelength scale including a copper foil membrane and postmortem tympanic membrane (TM).</p>
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Center for Holographic Studies and Laser micro-mechaTronics, WPI, Worcester, MA, USA</aff>
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<label>2</label>
Department of Mechanical Engineering, WPI, Worcester, MA, USA</aff>
<aff id="A3">
<label>3</label>
Eaton-Peabody Laboratory, Massachusetts Eye and Ear Infirmary, Boston, MA 02114, USA</aff>
<aff id="A4">
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Department of Otology and Laryngology, Harvard Medical School, Boston, MA, USA</aff>
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Speech and Hearing Bioscience and Technology Program, MIT-Harvard Division of Health Sciences and Technology, Cambridge, MA, USA</aff>
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Centro de Investigaciones en Optica A. C., Leon, Gto, Mexico</aff>
<author-notes>
<corresp id="cor1">Jorge Mauricio Flores Moreno, Mechanical Engineering Department, WPI, Worcester MA, USA, 01609.
<email>mflores@wpi.edu</email>
;
<email>jmflores@cio.mx</email>
;</corresp>
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<volume>33</volume>
<issue>5</issue>
<fpage>342</fpage>
<lpage>352</lpage>
<abstract>
<title>Summary</title>
<p id="P1">We describe a novel holographic otoscope system for measuring nano-displacements of objects subjected to dynamic excitation. Such measurements are necessary to quantify the mechanical deformation of surfaces in mechanics, acoustics, electronics, biology and many other fields. In particular, we are interested in measuring the sound-induced motion of biological samples, such as an eardrum. Our holographic otoscope system consists of laser illumination delivery (IS), optical head (OH), and image processing computer (IP) systems. The IS delivers the object beam (OB) and the reference beam (RB) to the OH. The backscattered light coming from the object illuminated by the OB interferes with the RB at the camera sensor plane to be digitally recorded as a hologram. The hologram is processed by the IP using Fresnel numerical reconstruction algorithm, where the focal plane can be selected freely. Our holographic otoscope system is currently deployed in a clinic, and is packaged in a custom design. It is mounted in a mechatronic positioning system to increase its maneuverability degrees to be conveniently positioned in front of the object to be measured. We present representative results highlighting the versatility of our system to measure deformations of complex elastic surfaces in the wavelength scale including a copper foil membrane and postmortem tympanic membrane (TM).</p>
</abstract>
<kwd-group>
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