Title :
Advanced Optical Microphone
Author :
Bakhoum, Ezzat G. ; Cheng, Marvin H. M.
Author_Institution :
Univ. of West Florida, Pensacola, FL, USA
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;
Journal_Title :
Sensors Journal, IEEE
DOI :
10.1109/JSEN.2013.2281727
