Advanced Optical Microphone

Author

Bakhoum, Ezzat G. ; Cheng, Marvin H. M.

Author_Institution

Univ. of West Florida, Pensacola, FL, USA

Volume

14

Issue

1

fYear

2014

fDate

Jan. 2014

Firstpage

7

Lastpage

14

Abstract

This paper introduces a new type of optical microphone that is characterized by structural simplicity and low cost, while retaining all the features offered by more expensive technologies such as laser interferometry. Operation of the new microphone relies on a reflective pattern that is etched on one side of the microphone´s diaphragm. An image of the pattern is captured by a charge-coupled device, and pattern recognition is performed in real time to determine the diaphragm´s instantaneous position. Hence, the complex task of detecting the minute variations in the diaphragm´s position are performed by cheap, high speed optical electronics rather than by means of interferometry as shown in the literature.

Keywords

CCD image sensors; diaphragms; etching; image recognition; microphones; optical sensors; charge-coupled device; diaphragm instantaneous position; etching; high speed optical electronics; laser interferometry; optical microphone; pattern recognition; reflective pattern; Charge coupled devices; Covariance matrices; Light emitting diodes; Microphones; Optical imaging; Optical interferometry; Pattern recognition; Optical microphone; charge-coupled device; covariance matrix; optical position sensing; pattern recognition;

fLanguage

English

Journal_Title

Sensors Journal, IEEE

Publisher

ieee

ISSN

1530-437X

Type

jour

DOI

10.1109/JSEN.2013.2281727

Filename

6600746