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authorBlaise Thompson <blaise@untzag.com>2018-04-11 22:13:49 -0500
committerBlaise Thompson <blaise@untzag.com>2018-04-11 22:13:49 -0500
commit30d81f3fc92064183eb786f153088ed198a1ee78 (patch)
tree039855c9ea710dfb2014e631fce45366449977ac /acquisition
parentf47987902f228af220b6a1b44d0ac06368324fbd (diff)
2018-04-11 22:13
Diffstat (limited to 'acquisition')
-rw-r--r--acquisition/chapter.tex75
1 files changed, 67 insertions, 8 deletions
diff --git a/acquisition/chapter.tex b/acquisition/chapter.tex
index ff6bcdf..78b4199 100644
--- a/acquisition/chapter.tex
+++ b/acquisition/chapter.tex
@@ -734,21 +734,80 @@ Each motor can be independently set and homed. %
\clearpage
\section{Sensors (devices)} \label{aqn:sec:sensors} % ============================================
-Sensors are...
+Sensors are the kind of things that actually measure data. %
+In spectroscopy these can be photodiodes, array detectors, photo-multiplier tubes etc. %
+In this section I describe the strategy that PyCMDS uses to represent sensors. %
+
+\subsection{The DAQ card} % ----------------------------------------------------------------------
+
+The National Instruments PCI-6251 card is capable of eight analog inputs and 1 million samples per
+second (one sample per microsecond). %
+Both instruments operate at 1 KHz, so that leaves 1000 samples per shot. %
+It is important to be able to configure all of the timings within each shot. %
+
+\autoref{aqn:fig:samples} shows the GUI designed to control the sample level timing of the NI
+PCI-6251 card. %
+All 1000 samples for the current shot are displayed in the large central plot. %
+Users may allocate regions of samples to be assigned to particular channels. %
+A second region may be allocated for explicit baseline subtraction. %
+For things like PMTs, make sure these two regions are the same size. % BJT: explain why
+For each region, a simple processing method is applied before the baseline is (optionally)
+subtracted and the signal is (optionally) inverted. %
+All of this results in a single processed value for each channel on each shot. %
+Users may also allocate exactly one sample for chopper monitoring. %
+
+\autoref{aqn:fig:shots} is a screenshot of the shots GUI. %
+Only one channel is shown, chosen by the pull down menu on the right hand side. %
+Each point is one processed value from all of the samples designated for that particular shot. %
+Because this instrument is using dual chopping at this time, only one out of four shots has a large
+amount of light, so most shots are near zero in \autoref{aqn:fig:shots}. %
+
+[SHOTS PROCESSING]
+
+% BJT: more about the power of digital processing
+%Old boxcar: 300 ns window, ~10 micosecond delay. Onset of saturation ~2 V.
-For DAQ cards, shots and samples...
+\begin{landscape}
+\begin{figure}
+ \includegraphics[width=9in]{"acquisition/screenshots/003"}
+ \caption{
+ CAPTION TODO
+ }
+ \label{aqn:fig:samples}
+\end{figure}
+\end{landscape}
-Power of digital processing...
+\begin{landscape}
+\begin{figure}
+ \includegraphics[width=9in]{"acquisition/screenshots/002"}
+ \caption{
+ CAPTION TODO
+ }
+ \label{aqn:fig:shots}
+\end{figure}
+\end{landscape}
-Old boxcar: 300 ns window, ~10 micosecond delay. Onset of saturation ~2 V.
+\begin{figure}
+ \caption{
+ TODO: SHOTS PROCESSING SCRIPT
+ }
+\end{figure}
-% TODO: screenshots
+\subsection{Multidimensional sensors} % ----------------------------------------------------------
-\subsection{Sensors as axes} % -------------------------------------------------------------------
+Sensors need not be single valued at each hardware coordinate. %
+Sometimes, a sensor returns an entire array of information. %
+In cases like these, PyCMDS expands the dimensionality of the scan to accommodate the many-valued
+sensor. %
-% TODO: equation from Skye
+For example, consider \autoref{aqn:fig:array_as_axis}. %
+This simple tune test was taken with an array detector, rather than using a scanning
+monochromator. %
+Although only one piece of hardware was scanned, the data is considered to be
+\emph{two}-dimensional, with the second dimension being $\bar{\nu}_a$, the differential color axis
+for the array vs the OPA setpoint. %
-% TODO: poweramp tune test (see darien slack)
+[EQUATION]
\begin{figure}
\includegraphics[scale=0.5]{"acquisition/tune_test"}