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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.2//EN"><!--Converted with LaTeX2HTML 96.1 (Feb 5, 1996) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds --><HTML><HEAD><TITLE>6.3 Radio Baton</TITLE><META NAME="description" CONTENT="6.3 Radio Baton"><META NAME="keywords" CONTENT="sensors"><META NAME="resource-type" CONTENT="document"><META NAME="distribution" CONTENT="global"><LINK REL=STYLESHEET HREF="sensors.css" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/sensors.css"></HEAD><BODY BGCOLOR="#FFFFFF" TEXT="#000000" LANG="EN"> <A NAME="tex2html358" HREF="node28.html" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/node28.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="next_motif.gif" tppabs="http://ccrma.stanford.edu/Images//next_motif.gif"></A> <A NAME="tex2html356" HREF="node24.html" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/node24.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="up_motif.gif" tppabs="http://ccrma.stanford.edu/Images//up_motif.gif"></A> <A NAME="tex2html352" HREF="node26.html" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/node26.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="previous_motif.gif" tppabs="http://ccrma.stanford.edu/Images//previous_motif.gif"></A> <BR><B> Next:</B> <A NAME="tex2html359" HREF="node28.html" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/node28.html"> About this document </A><B>Up:</B> <A NAME="tex2html357" HREF="node24.html" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/node24.html">6 System Integration</A><B> Previous:</B> <A NAME="tex2html353" HREF="node26.html" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/node26.html">6.2 BioMuse</A><BR> <P><H2><A NAME="SECTION00063000000000000000">6.3 Radio Baton</A></H2><P>The Radio-Baton is a device which tracks the motions of the tips of 2 batons in a 3
dimensional space. The main components of the system are 2 batons, and a base unit
called the ``antenna.'' The tips of each of the batons are shrouded in copper, and 5 copper
plates are housed in the base unit. By measuring the electrical capacitance between the tip
of the baton and each of the 5 plates, the system is able to localize of the tips of each of
the batons. Each of the 5 capacitors will vary as a nonlinear function of the distance
between tip of the baton and the copper plate. This is depicted in Figure <A HREF="node27.html#Baton2" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/node27.html#Baton2">46</A>.<P><P ALIGN=CENTER><A NAME="878"> </A><A NAME="Baton2"> </A> <IMG WIDTH=436 HEIGHT=283 ALIGN=BOTTOM ALT="figure886" SRC="img130.gif" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/img130.gif" > <BR>
</P>
<STRONG>Figure 46:</STRONG> The capacitive elements of the Radio Baton <BR><P><P>The remainder of the Radio Baton system is shown in Figure <A HREF="node27.html#Baton1" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/node27.html#Baton1">47</A>. Capacitors are devices
which exhibit an electrical impedance (the AC counterpart to resistance) which varies
inversely proportional to the capacitance of the device. By applying an alternating current
of known voltage to the plates of the capacitor, one can determine the impedance, and
hence the capacitance by measuring the current flow through the device. This is the basic
principle of operation of the radio baton. In the case of the radio baton, the voltage is an
AC signal with a frequency of 50kHz. The current through each of the 5 capacitive
elements is measured, and converted to a voltage which reflects the magnitude of this
current. This voltage is subsequently measured by the ADC converter.<P>The set of 5 current measurements is processed by an embedded 80186 processor, which
is programmed to turn the set or measurements into a position given as a set of 3 cartesian
coordinates. An important aspect of this procedure is to compensate for the nonlinear
relation between the measured current and that actual position.<P><P ALIGN=CENTER><A NAME="885"> </A><A NAME="Baton1"> </A> <IMG WIDTH=431 HEIGHT=591 ALIGN=BOTTOM ALT="figure893" SRC="img131.gif" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/img131.gif" > <BR>
</P>
<STRONG>Figure 47:</STRONG> Block diagram of the Radio Baton system. <BR><P><HR><A NAME="tex2html358" HREF="node28.html" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/node28.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="next_motif.gif" tppabs="http://ccrma.stanford.edu/Images//next_motif.gif"></A> <A NAME="tex2html356" HREF="node24.html" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/node24.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="up_motif.gif" tppabs="http://ccrma.stanford.edu/Images//up_motif.gif"></A> <A NAME="tex2html352" HREF="node26.html" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/node26.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="previous_motif.gif" tppabs="http://ccrma.stanford.edu/Images//previous_motif.gif"></A> <BR><B> Next:</B> <A NAME="tex2html359" HREF="node28.html" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/node28.html"> About this document </A><B>Up:</B> <A NAME="tex2html357" HREF="node24.html" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/node24.html">6 System Integration</A><B> Previous:</B> <A NAME="tex2html353" HREF="node26.html" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/node26.html">6.2 BioMuse</A><P><ADDRESS><I>Tim Stilson <BR>Thu Oct 17 16:32:33 PDT 1996</I></ADDRESS></BODY></HTML>⌨️ 快捷键说明
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