From: W. Trevor King Date: Fri, 3 May 2013 20:58:29 +0000 (-0400) Subject: calibcant/theory.tex: Increase linking to apparatus/cantilever-calib X-Git-Tag: v1.0~266 X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=544b2535568fea7c0d60e76ccc127cbd3cf953c3;p=thesis.git calibcant/theory.tex: Increase linking to apparatus/cantilever-calib --- diff --git a/src/apparatus/cantilever-calib.tex b/src/apparatus/cantilever-calib.tex index d0a01e1..68e1d64 100644 --- a/src/apparatus/cantilever-calib.tex +++ b/src/apparatus/cantilever-calib.tex @@ -54,6 +54,7 @@ power spectral density ($\PSD_f$\index{PSD@\PSD!in frequency space}) of a damped harmonic oscillator exposed to thermal noise \begin{equation} \PSD_f(V_p, f) = \frac{G_{1f}}{(f_0^2-f^2)^2 + \beta_f^2 f^2} \;. + \label{eq:psd-Vp} \end{equation} In terms of the fit parameters $G_{1f}$\index{$G_{1f}$}, $f_0$\index{$f_0$}, and $\beta_f$\index{$\beta_f$}, the expectation diff --git a/src/calibcant/theory.tex b/src/calibcant/theory.tex index 2b0f394..28ad001 100644 --- a/src/calibcant/theory.tex +++ b/src/calibcant/theory.tex @@ -302,7 +302,7 @@ we have = \sigma_p^2 \avg{x(t)^2} \;, \end{align} where $G_{1p}\equiv G_0/m_p^2=\sigma_p^2 G_1$. -Plugging into the equipartition theorem yeilds +Plugging into the equipartition theorem (\cref{eq:equipart_k}) yields \begin{align} \kappa &= \frac{\sigma_p^2 k_BT}{\avg{V_p(t)^2}} = \frac{2 \beta\omega_0^2 \sigma_p^2 k_BT}{\pi G_{1p}} \;. @@ -347,7 +347,7 @@ The variance of the function $x(t)$ is then given by plugging into = \iOInf{f}{\frac{1}{2\pi}\PSD_f(x,f)2\pi\cdot} = \iOInf{f}{\PSD_f(x,f)} \;. \end{align} -Therefore +We can now extract \cref{eq:psd-Vp,eq:Vp-from-freq-fit}. \begin{align} \begin{split} \PSD_f(V_p, f) &= 2\pi\PSD(V_p,\omega) @@ -361,7 +361,8 @@ Therefore % = \frac{\pi G_{1p}}{2\beta\omega_0^2} = \avg{V_p(t)^2} % check! \end{align} where $f_0\equiv\omega_0/2\pi$, $\beta_f\equiv\beta/2\pi$, and -$G_{1f}\equiv G_{1p}/8\pi^3$. Finally +$G_{1f}\equiv G_{1p}/8\pi^3$. Finally, we can generate +\cref{eq:kappa}. \begin{align} \kappa &= \frac{\sigma_p^2 k_BT}{\avg{V_p(t)^2}} = \frac{2 \beta_f f_0^2 \sigma_p^2 k_BT}{\pi G_{1f}} \;.