Digital ear scanner : measuring the compliance of the ear

This paper seeks to resolve the biggest problem with hearing aids, their physical fit. By digitally scanning the ear canal and taking the dynamics of the ear into account the performance and comfort of a hearing aid can be greatly improved. Current optical techniques for 3-D imaging are too expensive to be implemented in the ear canal for the purpose of custom fitted hearing aids. A new absorption based optical technique is introduced, which is capable of generating three dimensional maps of an ear subjected to a varying pressure. Specifically a hearing aid can be constructed with allowances for the compliance of the ear and the distortions associated with jaw movement. It is shown that the information that can be captured with this new technique will be of value toward improving hearing aids, and that the hearing aid industry is ready to take advantage of a digital scanner. A one dimensional calibration was made, and qualitative 3-D data is shown. The imaging technique was implemented with much lower cost equipment then would be needed by other 3-D techniques such as interferometry. A technique for the laboratory manufacture of brushed on fluorescent balloons was presented that are suitable to be used by this imaging technique to measure the dynamics of the ear. The bulk compliance of a human ear in vitro was measured with a laboratory fabricated balloon.

Department dc:contributor.department

Massachusetts Institute of Technology. Dept. of Mechanical Engineering.

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2010

Author dc:creator

• Hernandez-Stewart, Daniel

Advisor dc:contributor.advisor

• Doug Hart.

• Mechanical Engineering.

Statement dc:rights

• M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/57792

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/57792