From 9db46ddb7c11d1e14d8dad9cd151af34f72b2c9f Mon Sep 17 00:00:00 2001 From: "lorenzo.zolfanelli93" Date: Thu, 27 Aug 2020 12:53:16 +0000 Subject: [PATCH] Update on Overleaf. --- chapters/3-methods.tex | 24 ++++++++++++++++++++++-- images/step_response.pdf | Bin 0 -> 29488 bytes 2 files changed, 22 insertions(+), 2 deletions(-) create mode 100644 images/step_response.pdf diff --git a/chapters/3-methods.tex b/chapters/3-methods.tex index 44449c0..281441f 100644 --- a/chapters/3-methods.tex +++ b/chapters/3-methods.tex @@ -89,7 +89,7 @@ calcolata in un raggio di \SI{60}{pixel}. \begin{figure}[ht] \centering - \includegraphics{images/z-est.pdf} + \includegraphics[scale=0.8]{images/z-est.pdf} \caption{Andamento del rapporto intensità anello/cerchio in funzione della quota del piano focale.} \label{fig:z_est} @@ -133,7 +133,27 @@ stabile indipendentemente dal tempo di osservazione, con fluttuazione che hanno una deviazione standard di circa \SI{1}{\nm}. Introdurre nel ciclo di controlla alla componente proporzionale una componente integrale o derivativa non altera significativamente -la stabilizzazione raggiunta. +la stabilizzazione raggiunta. +Il fattore di proporzionalità del ciclo di retroazione +(guadagno, $g$) influenza +le caratteristiche della risposta del sistema: un fattore troppo +elevato causerà una sovracorrezione delle perturbazioni, inducendo +oscillazioni smorzate, mentre un fattore troppo piccolo aumenterà +inutilmente il tempo di risposta. Per trovare il valore ottimale +si osserva la risposta del sistema per diversi valori di $g$, in +seguito ad una perturbazione fittizia ottenuta modificando di +\SI{50}{\nm} il \textit{set point} lungo una direzione. +In figura \ref{fig:step_response} si riporta la risposta del +sistema di stabilizzazione per gli assi $x$ e $z$ a diversi valori +del fattore di proporzionalità $g$. + +\begin{figure} + \centering + \includegraphics{images/step_response.pdf} + \caption{Risposta del sistema a una perturbazione di \SI{50}{\nm} + lungo l'asse $x$ (sinistra) e $z$ (destra).} + \label{fig:step_response} +\end{figure} L'acquisizione di diverse tracce della durata di 5-10 minuti ha sempre mostrato deviazioni standard delle fluttuazioni comprese diff --git a/images/step_response.pdf b/images/step_response.pdf new file mode 100644 index 0000000000000000000000000000000000000000..975e91815f163b3019d95afef7440500f46db12e GIT binary patch literal 29488 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