OATAO - Open Archive Toulouse Archive Ouverte Open Access Week

Nonintrusive Acoustic Measurements by Optical Feedback Interferometry

Knudsen, Einar. Nonintrusive Acoustic Measurements by Optical Feedback Interferometry. PhD, Photonique et système optoélectronique, Institut National Polytechnique de Toulouse, 2021

(Document in English)

PDF (Author's version) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader


In this PhD we present the development of a Class 1 microphone using Optical Feedback Interferometry. The acoustic waves are measured thought the acoustooptic effect. We build a dedicated, repeatable and robust experiment showing the impact of the fringe shape on acquisitions of sub-⁄/2 optical path variations. We demonstrate experimentally that the aquired signal amplitude is linearly coupled to the slope of the fringe, a result not yet explicitly published in the OFI literature. As a second research subject in this PhD we present a demonstrator of the Acoustic LIDAR by Optical Feedback Interferometry for the remote acquisitions of acoustic waves. We develop a demodulation algorithm that extracts the acoustic information from a flow of particles that is made to oscillate by an acoustic wave. The experimental demonstrator is capable of acquiring acoustic waves remotely at over 11 m from the detector.

Item Type:PhD Thesis
Uncontrolled Keywords:
Institution:Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Laboratory name:
Research Director:
Bosch, Thierry and Perchoux, Julien
Deposited On:25 Nov 2021 09:14

Repository Staff Only: item control page