X-Git-Url: https://bilbo.iut-bm.univ-fcomte.fr/and/gitweb/dmems12.git/blobdiff_plain/68ef101fa4f71c2911e9ffa93ceb5e07afb4af88..4d2d346e47215fbef2ad2e0e1b4c3b33bb2923fa:/dmems12.tex

diff --git a/dmems12.tex b/dmems12.tex
index 51d7344..ed1709b 100644
--- a/dmems12.tex
+++ b/dmems12.tex
@@ -1,8 +1,9 @@
-\documentclass[12pt]{article}
+
+\documentclass[10pt, conference, compsocconf]{IEEEtran}
 %\usepackage{latex8}
 %\usepackage{times}
-\usepackage[latin1]{inputenc}
-\usepackage[cyr]{aeguill}
+\usepackage[utf8]{inputenc}
+%\usepackage[cyr]{aeguill}
 %\usepackage{pstricks,pst-node,pst-text,pst-3d}
 %\usepackage{babel}
 \usepackage{amsmath}
@@ -24,29 +25,38 @@
 
 \newcommand{\tab}{\ \ \ }
 
-%%%%%%%%%%%%%%%%%%%%%%%%%%%% my bib path.
+
+
+\begin{document}
+
+
+%% \author{\IEEEauthorblockN{Authors Name/s per 1st Affiliation (Author)}
+%% \IEEEauthorblockA{line 1 (of Affiliation): dept. name of organization\\
+%% line 2: name of organization, acronyms acceptable\\
+%% line 3: City, Country\\
+%% line 4: Email: name@xyz.com}
+%% \and
+%% \IEEEauthorblockN{Authors Name/s per 2nd Affiliation (Author)}
+%% \IEEEauthorblockA{line 1 (of Affiliation): dept. name of organization\\
+%% line 2: name of organization, acronyms acceptable\\
+%% line 3: City, Country\\
+%% line 4: Email: name@xyz.com}
+%% }
+
 
 
 \title{Using FPGAs for high speed and real time cantilever deflection estimation}
+\author{\IEEEauthorblockN{Raphaël Couturier\IEEEauthorrefmark{1}, Stéphane Domas\IEEEauthorrefmark{1}, Gwenhaël Goavec-Merou\IEEEauthorrefmark{2} and Michel Lenczner\IEEEauthorrefmark{2}}
+\IEEEauthorblockA{\IEEEauthorrefmark{1}FEMTO-ST, DISC, University of Franche-Comte, Belfort, France\\
+\{raphael.couturier,stephane.domas\}@univ-fcomte.fr}
+\IEEEauthorblockA{\IEEEauthorrefmark{2}FEMTO-ST, Time-Frequency, University of Franche-Comte, Besançon, France\\
+\{michel.lenczner@utbm.fr,gwenhael.goavec@trabucayre.com}
+}
+
+
 
-\author{ Raphaël COUTURIER\\
-Laboratoire d'Informatique 
-de l'Universit\'e de  Franche-Comt\'e, \\
-BP 527, \\
-90016~Belfort CEDEX, France\\
- \and Stéphane Domas\\
-Laboratoire d'Informatique 
-de l'Universit\'e de  Franche-Comt\'e, \\
-BP 527, \\
-90016~Belfort CEDEX, France\\
- \and Gwenhaël Goavec\\
-??
-?? \\
-??, \\
-??\\}
 
 
-\begin{document}
 
 \maketitle
 
@@ -61,12 +71,78 @@ BP 527, \\
 
 \section{Introduction}
 
-%% blabla +
+Cantilevers  are  used  inside  atomic  force  microscope  which  provides  high
+resolution images of  surfaces.  Several technics have been  used to measure the
+displacement  of cantilevers  in litterature.   For example,  it is  possible to
+determine  accurately  the  deflection  with different  mechanisms. 
+In~\cite{CantiPiezzo01},   authors  used   piezoresistor  integrated   into  the
+cantilever.   Nevertheless this  approach  suffers from  the  complexity of  the
+microfabrication  process needed  to  implement the  sensor  in the  cantilever.
+In~\cite{CantiCapacitive03},  authors  have  presented an  cantilever  mechanism
+based on  capacitive sensing. This kind  of technic also  involves to instrument
+the cantiliver which result in a complex fabrication process.
+
+In this  paper our attention is focused  on a method based  on interferometry to
+measure cantilevers' displacements.  In  this method cantilevers are illuminated
+by  an optic  source. The  interferometry produces  fringes on  each cantilevers
+which enables to  compute the cantilever displacement.  In  order to analyze the
+fringes a  high speed camera  is used. Images  need to be processed  quickly and
+then  a estimation  method is  required to  determine the  displacement  of each
+cantilever.  In~\cite{AFMCSEM11},  the authors have  used an algorithm  based on
+spline to estimate the cantilevers' positions.
+%%RAPH : ce qui est génant c'est qu'ils ne parlent pas de spline dans ce papier...
+   The overall  process gives
+accurate results  but all the computation  are performed on  a standard computer
+using labview.  Consequently,  the main drawback of this  implementation is that
+the computer is a bootleneck in the overall process. In this paper we propose to
+use a  method based on least  square and to  implement all the computation  on a
+FGPA.
+
+The remainder  of the paper  is organized as  follows. Section~\ref{sec:measure}
+describes  more precisely  the measurement  process. Our  solution based  on the
+least  square   method  and   the  implementation  on   FPGA  is   presented  in
+Section~\ref{sec:solus}.       Experimentations      are       described      in
+Section~\ref{sec:results}.  Finally  a  conclusion  and  some  perspectives  are
+presented.
+
+
+
 %% quelques ref commentées sur les calculs basés sur l'interférométrie
 
 \section{Measurement principles}
 \label{sec:measure}
 
+In order to develop simple,  cost effective and user-friendly cantilever arrays,
+authors   of    ~\cite{AFMCSEM11}   have   developped   a    system   based   of
+interferometry. In opposition to other optical based systems, using a laser beam
+deflection scheme and  sentitive to the angular displacement  of the cantilever,
+interferometry  is sensitive  to  the  optical path  difference  induced by  the
+vertical displacement of the cantilever.
+%%RAPH : est ce qu'on pique une image? génant ou non?
+The system build  by authors of~\cite{AFMCSEM11} has been  developped based on a
+Linnick interferomter~\cite{Sinclair:05}.   A laser beam is first  split (by the
+splitter) into  a reference beam  and a sample  beam that reachs  the cantilever
+array.  In  order to be able  to move the cantilever  array, it is  mounted on a
+translation  and rotational  stage with  five  degrees of  freedom. The  optical
+system is also fixed to the stage. Thus, the cantilever array is centered in the
+optical system which can be adjusted accurately.  The beam illuminates the array
+by a  microscope objective and the  light reflects on  the cantilevers. Likewise
+the reference beam reflects on a movable mirror.  A CMOS camera chip records the
+reference and  sample beams which  are recombined in  the beam splitter  and the
+interferogram. At the beginning of each experiment, the movable mirror is fitted
+manually in order to align the interferometric fringes approximately parallel to
+the  cantilevers. When  cantilevers  move due  to  the surface,  the bending  of
+cantilevers produce movements in the fringes  that can be detected with the CMOS
+camera.  Finally  the fringes  need  to  be  analyzed. In~\cite{AFMCSEM11},  the
+authors used  a LabView program to  compute the cantilevers'  movements from the
+fringes.
+
+
+
+
+
+
+
 \subsection{Architecture}
 \label{sec:archi}
 %% description de l'architecture générale de l'acquisition d'images
@@ -122,7 +198,7 @@ consider the camera actually in use, an exposition time of 2.5ms for
 $1024\times 1204$ pixels seems the minimum that can be reached. For a
 $10\times 10$ cantilever array, if we neglect the time to extract
 pixels, it implies that computing the deflection of a single
-cantilever should take less than 25$µ$s, thus 12.5$µ$s by phase.\\
+cantilever should take less than 25$\mu$s, thus 12.5$\mu$s by phase.\\
 
 In fact, this timing is a very hard constraint. Let consider a very
 small programm that initializes twenty million of doubles in memory
@@ -135,7 +211,7 @@ $3000$ operations.
 
 %% to be continued ...
 
-%% à faire : timing de l'algo spline en C avec atan et tout le bordel.
+%% � faire : timing de l'algo spline en C avec atan et tout le bordel.
 
 
 
@@ -318,9 +394,9 @@ Finally, the whole summarizes in an algorithm (called LSQ in the following) in t
 
 \subsubsection{Comparison}
 
-\subsection{VDHL design paradigms}
+\subsection{VHDL design paradigms}
 
-\subsection{VDHL implementation}
+\subsection{VHDL implementation}
 
 \section{Experimental results}
 \label{sec:results}