28ddbc420d
- Added a listen mode to commandlog in order to support the batchEditor - Some small fixes to exe* for BatchEditor
97 lines
3.7 KiB
OpenEdge ABL
97 lines
3.7 KiB
OpenEdge ABL
\subsection{Differential Scan}
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This is a special very fast but inaccurate scan method. The scan motor is
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set into motion and counts are collected on the fly, while the motor
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is moving. As neither the motor speed, nor the counters response nor
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the source stability can be relied upon to result in equally spaced
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and well defined counts, the counts have to be scaled according to the
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difference in monitor counts towards the previous count. This is why
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this is called differential scan. This is not a
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precise scan. But is a very fast one which helps locating peaks or
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during alignment.
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This is implemented as an operator on top of the standard scan
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module. All scan details, scan variables etc have to be configured in
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the main scan module. This object then just runs the diff scan and
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stores the result in the main scan object for further processing. For
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instance peak location. The end of the scan is calculated from the
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start, step and NP of the main scan module. be aware that these values
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have no well defined meaning during this kind of scan, NP will be
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corrected to account for the points actually measured.
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As motors cannot be guaranteed to run simulataneously, only one scan
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variable is suported for this.
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The actual control of this scan is hidden in a task function which is
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responsible for storing the data and stopping when the motor has
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finished driving.
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In order to do a differential scan a data structure is required:
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@d diffscandat @{
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typedef struct {
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pObjectDescriptor pDes;
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ObPar *parArray;
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int normalizationScale;
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int scaleMonitor;
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CountEntry last;
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int skip;
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int skipCount;
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pScanData scanObject;
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} DiffScan, *pDiffScan;
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@}
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The fields:
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\begin{description}
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\item[pDes] The standard object descriptor.
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\item[parArray] An array of parameters for the module.
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\item[normalizationScale] The scale to which to scale counts during
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counting.This will be the monitor difference between the first and the
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second point.
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\item[lastMonitor] is the last monitor read for caluclating differences.
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\item[scaleMonitor] The monitor to use for scaling. This should better
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be a monitor with a high count rate for acurate scaling.
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\item[skip] How many cycles of the main loop to skip between
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recordings.
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\item[skipCount] Counter for skipped cycles. Together with skip this
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is a means to limit the sampling rate of diffscan.
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\item[scanObject] The scan object we are operating upon.
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\end{description}
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The external interface to this module is like this:
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@d diffscanint @{
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/**
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* RunDiffScan runs a differential scan.
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* @@param self The Diffscan object to use
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* @@param pScan The scan object to use for configuration and for
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* for storing the results.
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* @@param pCon The connection to use for output and errors.
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* @@param fEnd The end value for the diffscan
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*/
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int RunDiffScan(pDiffScan self, pScanData pScan,
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SConnection *pCon, float fEnd);
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/*==================== interpreter wrappers ==========================*/
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int DiffScanWrapper(SConnection *pCon, SicsInterp *pSics, void *pData,
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int argc, char *argv[]);
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int MakeDiffScan(SConnection *pCon, SicsInterp *pSics, void *pData,
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int argc, char *argv[]);
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@}
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@o diffscan.h @{
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/*-------------------------------------------------------------------
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diffscan is an operator which can perform a fast differential scan
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while a motor is running.
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copyright: see file COPYRIGHT
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Mark Koennecke, November 2004
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---------------------------------------------------------------------*/
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#ifndef SICSDIFFSCAN
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#define SICSDIFFSCAN
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#include "obpar.h"
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#include "scan.h"
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#include "scan.i"
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@<diffscandat@>
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/*==================================================================*/
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@<diffscanint@>
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#endif
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@} |