Design and development of a fibre optic microphone

Ikin, James (2013) Design and development of a fibre optic microphone. [USQ Project]


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Research into using optical fibres as the key components in a sensor has been of great interest to many over the past 50 years(Culshaw & Kersey 2008). Optical fibre sensors
prove to have many advantages over conventional electronic sensors. In fact there are many environments where using an electronic sensor may prove to be to be ineffective or outright unuseable (Lee, Kim, Park, Eom, Myoung, Kim, Rho & Choi 2012). Unfortunately optical fibres encounter many other different disadvantages that electronic microphones do not. Therefore optical fibre sensors are still generally only designed and built for specific applications.

One of the optical fibre sensors that has had a great deal of research is the Fibre Optic Microphone (FOM), this particular area of optical fibre sensors is the focus of this dissertation. During the completion of this dissertation many different types of FOMs were investigated, however it soon proved to be too much effort to attempt to learn and categorize each different type. The shear amount of configurations, components and forms of modulating light was staggering.

Different physical effects were investigated during the project work, some examples of what was investigated included Fresnel Reections, Acousto-Optic Effect and
Interferometry. After the different types of FOMs were investigated and reviewed, several promising types of FOMs were chosen to be investigated further and constructed in
order to evaluate their performance characteristics.

However due to time and equipment constraints it was not possible to get all of the different types of FOMs to work properly, in the end only one type of FOM was completed. This was the Helix Acousto-Optic Microphone.

The Helix Acousto-Optic sensor was then run through a series of tests in order to examine the performance characteristics. The sensor was placed into two different
types of configurations, the first was just a basic sensor configuration and the second was a Mach-Zehnder interferometer configuration.

After the performance characteristics were examined it was evident that the Mach-Zehnder interferometer configuration proved to be the better of the two by a great margin.

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Item Type: USQ Project
Item Status: Live Archive
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering (1 Jul 2013 - 31 Dec 2021)
Supervisors: Leis, John
Date Deposited: 07 Mar 2014 11:30
Last Modified: 09 Mar 2014 23:42
Uncontrolled Keywords: design; helis acousto-optic microphone; optical fibres
Fields of Research (2008): 09 Engineering > 0906 Electrical and Electronic Engineering > 090603 Industrial Electronics
Fields of Research (2020): 40 ENGINEERING > 4009 Electronics, sensors and digital hardware > 400907 Industrial electronics
Socio-Economic Objectives (2008): B Economic Development > 86 Manufacturing > 8610 Ceramics, Glass and Industrial Mineral Products > 861005 Structural Glass and Glass Products
B Economic Development > 86 Manufacturing > 8615 Instrumentation > 861501 Industrial Instruments

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