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SUMMARY:Self-Mixing Interferometry: a Universal Yardstick to Measure Almos
 t Everything
DTSTART:20170307T110000
DTEND:20170307T120000
DTSTAMP:20260509T130610Z
UID:931ea1a58d54409abbb1d3dca8cfea99ef7e559d6d8d83639263f79e
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Dr. Silvano Donati\nEPFL IMT Distinguished Lecture Serie
 s\n\nAbstract: In this talk\, we describe the principle of operation of se
 lf-mixing interferometer\, a new coherent configuration for the measuremen
 t of dimensional and kinematic quantities such as: displacement\, distance
 \, vibration amplitude\, thickness\, angle\, and curvature\, and also phys
 ical quantities like: coupling factors\, line width\, alfa-factor\, and in
 dex of refraction. In the measurement arrangement\, the laser undergoes se
 lf-injection at weak level\, leading to an amplitude and frequency modulat
 ion driven by external optical path length.  Then we will treat developme
 nt of a displacement-measuring instrument\, first by up/down counting of m
 ode hops\, then extending the measurement to the case of a diffuse target\
 , reflecting back a field affected by the speckle-pattern statistics. We w
 ill report on implementation of two-channel (or\, referenced) vibrometer\,
  based on analogue processing of the self-mix signal\, in which the speckl
 e-related amplitude errors are removed thanks to a servo-loop concept\, an
 d the instrument is capable of true differential operation\, on diffuse su
 rface\, exemplified by the non-contact detection of a mechanical hysterisi
 s cycle in the stress/strain diagram. Additional example of measurements p
 erformed by self-mix will be finally surveyed\, i.e.\, the absolute distan
 ce meter\, the thickness\, angles and return echoes measurements as well a
 s that of linewidth and alpha-factor. An outlook on perspectives and futur
 e perspectives of self-mix will conclude the talk.\n\nBio: Prof. Silvano D
 onati\, Emeritus of University of Pavia\, IEEE Life Fellow\, OSA Emeritus 
 Fellow. For the research on Selfmix Interferometry\, Prof. Donati has been
  awarded the 2015 "A Kressel Award" by the IEEE Photonics Society. Referen
 ces: ”Developing Self-Mixing Interferometry for Instrumentation and Meas
 urements” Laser and Photonics Review\, vol.5 (2011)\, (DOI) 10.1002/ lpo
 r.201100002\, see also the book\, S.Donati: Electooptical Instrumentation\
 , Prentice Hall 2004\, Chapter 4.  
LOCATION:SV 1717 https://plan.epfl.ch/?room==SV%201717
STATUS:CONFIRMED
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