%! TEX root = ../../../facharbeit.tex
% LTeX: language=de-DE

\begin{figure}[tbhp]
	\begin{tikzpicture}
		\node at (0,0) [rectangle,draw] (a) {Detektor};
		\node at (4,0) [rectangle,draw] (b) {Detektor};
		\node at (8,0) [rectangle,draw] (c) {Detektor};

		\def\offset{0.5}
		\def\lineWidth{0.8}
		\def\laserDualLine{0.05}
		\def\laserLineWidth{0.6}
		% a
		\node [below] at ($(a) - (0,0.4)$) {$a$};
		\draw[line width=\lineWidth pt] ($(a) + (\offset,\offset)$) -- ($(a) + (-\offset,\offset)$) node [left] {Rayleigh-Sperrfilter};
		\draw[line width=\lineWidth pt] ($(a) + (\offset,\offset * 4)$) node [below right, align=left] {Dichroitischer\\ Spiegel} -- ($(a) + (-\offset,\offset * 2)$);

		\node at ($(a) + (-\offset * 3, \offset * 3)$) [rectangle, draw] (aLaser) {Laser};
		\node at ($(a) + (0, \offset * 9)$) [circle,draw] (aSample) {Probe};
		\node at ($(a) + (0, \offset * 6)$) [ellipse, draw, label=left:Linse, minimum width=1cm] (aLens) {};
		\coordinate (aLaserHit) at ($(a) + (0, \offset * 3)$);

		\draw[red, ->, line width=\laserLineWidth] (aLaser) -- ($(aLaserHit) - (\laserDualLine,0)$);
		\draw[red, ->, line width=\laserLineWidth] ($(aLaserHit) - (\laserDualLine,0)$) -- ($(aSample) - (\laserDualLine,0.58)$);
		\draw[green,<-, line width=\laserLineWidth] (a) -- (aSample);

		% b
		\node [below] at ($(b) - (0,0.4)$) {$b$};
		\coordinate (bFirst) at ($(b) + (\offset,\offset*2)$);
		\coordinate (bSecond) at ($(b) + (\offset,\offset)$) ;

		\draw[line width=\lineWidth pt] ($(b) + (-\offset,\offset*2)$) -- (bFirst);
		\draw[line width=\lineWidth pt] ($(b) + (-\offset,\offset)$) -- (bSecond);
		\node[right, align=left] at ($(bFirst)!0.5!(bSecond)$) (bRayleighThing) {Rayleigh-\\Sperrfilter};


		\node at ($(b) + (0, \offset * 9)$) [circle,draw] (bSample) {Probe};
		\node at ($(b) + (-0.3, \offset * 16)$) [rectangle, draw, rotate=90, anchor=north] (bLaser) {Laser};
		\node at ($(b) + (0, \offset * 6)$) [ellipse, draw, label=left:Linse, minimum width=1cm] (bLens1) {};
		\node at ($(b) + (0, \offset * 12)$) [ellipse, draw, label=left:Linse, minimum width=1cm] (bLens2) {};

		\draw[red,->, line width=\laserLineWidth] (bLaser) -- ($(b) + (0, \offset * 2)$);
		\draw[green, ->, line width=\laserLineWidth] ($(bSample) - (\laserDualLine, 0.60)$) -- ($(b) - (\laserDualLine, -0.2)$);

		% c
		\node [below] at ($(c) - (0,0.4)$) {$c$};

		\node at ($(c) + (0, \offset * 9)$) [circle,draw] (cSample) {Probe};
		\node at ($(c) + (0, \offset * 6)$) [ellipse, draw, label=left:Linse, minimum width=1cm] (cLens) {};
		\node at ($(c) + (\offset * 2, \offset * 9)$) [ellipse, draw, rotate=90, anchor=north, label=right:Linse, minimum width=1cm] (cLens) {};
		\node at ($(c) + (\offset * 5, \offset * 9)$) [rectangle, draw] (cLaser) {Laser};

		\draw[red, ->, line width=\laserLineWidth] (cLaser) -- ($(cSample) + (0.68,0)$);
		\draw[green,->, line width=\laserLineWidth] (cSample) -- (c);
	\end{tikzpicture}
	\caption{
		Vergleich der drei verschiedenen Raman Spektroskop Geometrien: Eine ($a$)
		zurückstreuende, ($b$) durchquerende oder ($c$) rechtwinklige Geometrie.
		Die roten Strahlen symbolisieren das direkt von dem Laser ausgesandte und
		Rayleigh gestreute Licht, die Grünen das von der Probe Raman gestreute Licht.
		Die Abbildung ist Abbildung 1 aus \cite{cellPhoneRamanSpec} nachempfunden.
	}\label{fig:DetektorPositioning}
\end{figure}