From 29b43c9f50ec87c314c94d91a121707c95236fa6 Mon Sep 17 00:00:00 2001
From: "W. Trevor King" <wking@tremily.us>
Date: Fri, 14 Jun 2013 14:28:46 -0400
Subject: [PATCH] pyafm/auxiliary.tex: Add a Peltier figure with a caption from
 my oral

---
 src/figures/schematic/peltier.asy | 48 +++++++++++++++++++++++++++++++
 src/pyafm/auxiliary.tex           | 14 +++++++--
 2 files changed, 59 insertions(+), 3 deletions(-)
 create mode 100644 src/figures/schematic/peltier.asy

diff --git a/src/figures/schematic/peltier.asy b/src/figures/schematic/peltier.asy
new file mode 100644
index 0000000..02cb2b6
--- /dev/null
+++ b/src/figures/schematic/peltier.asy
@@ -0,0 +1,48 @@
+import Circ;
+import ElectroMag;
+import Mechanics;
+
+real u = 0.75cm;
+real w = 1.75u;
+real wo = 0.75u;
+
+MultiTerminal bat = source(dir=180, type=DC);
+
+Block hot = Block(
+  center=bat.center + (0, 1.3u), width=4u, height=u, fill=red, L="heat sink");
+Block h_in = Block(center=hot.center + (-u, 0.75u), width=w, height=u/2);
+Block h_out = Block(center=hot.center + (u, 0.75u), width=w, height=u/2);
+Block n = Block(center=h_in.center + (0, 1.25u), width=w, height=2u,
+  fill=opacity(0.25)+blue, L=Label("n", align=E));
+Block p = Block(center=h_out.center + (0, 1.25u), width=w, height=2u,
+  fill=opacity(0.25)+red, L=Label("p", align=W));
+Block bridge = Block(
+  center=hot.center + (0, 3u), width=3.75u, height=u/2);
+Block cold = Block(
+  center=hot.center + (0, 3.75u), width=3.75u, height=u,
+  fill=blue, L="cooled");
+
+MultiTerminal cur = current(draw=false);
+cur.centerto(bridge.center + (-1, 0), bridge.center + (1, 0));
+
+Charge electron = nCharge(n.center + (-0.3u, 0), "-");
+Vector v_e = Velocity(center=electron.center(), dir=-90);
+
+Charge hole = pCharge(p.center + (0.3u, 0), "+");
+Vector v_h = Velocity(center=hole.center(), dir=-90);
+
+wire(bat.terminal[1], h_in.center + (-h_in.width/2, 0), type=rlsq, dist=-2u);
+wire(bat.terminal[0], h_out.center + (h_out.width/2, 0), type=rlsq, dist=2u);
+hot.draw();
+h_in.draw();
+h_out.draw();
+n.draw();
+p.draw();
+bridge.draw();
+cold.draw();
+cur.draw();
+
+v_e.draw();
+electron.draw();
+v_h.draw();
+hole.draw();
diff --git a/src/pyafm/auxiliary.tex b/src/pyafm/auxiliary.tex
index 80a409f..8c6a082 100644
--- a/src/pyafm/auxiliary.tex
+++ b/src/pyafm/auxiliary.tex
@@ -176,14 +176,22 @@ Thermoelectric Cooler Controller\citep{melcor} over a serial line.
 The controller monitors the fluid cell temperature with a
 thermocouple, and reading temperatures from the controller is fairly
 straightforward (\cref{fig:unfold-protein:unfolder}).  Temperature
-control is via a peltier mounted underneath the sample surface
+control is via a Peltier device mounted underneath the sample surface
 (\cref{fig:peltier}).
 
 \begin{figure}
   \begin{center}
-    % TODO: peltier image
+    \asyinclude{figures/schematic/peltier}
+    \caption{A Peltier functions by applying a voltage to regions of
+      p- and n-type semiconductor in series.  Conduction in n-type
+      semiconductors is mainly through thermally excited electrons and
+      in p-type semiconductors is mainly through thermally excited
+      holes.  Applying a positive voltage as shown in this figure
+      cools the sample by constantly pumping hot conductors in both
+      semiconductors towards heat sink, which radiates the heat into
+      the environment.  Reversing the applied voltage heats the
+      surface.\label{fig:peltier}}
   \end{center}
-  \caption{TODO.\label{fig:peltier}}
 \end{figure}
 
 The controller tries to keep the measured temperature at the setpoint
-- 
2.26.2