b7c9700c51
- Fixed two small issues with evcontroller: no test for privilege on drive - Many changes to AMOR software.
123 lines
4.6 KiB
OpenEdge ABL
123 lines
4.6 KiB
OpenEdge ABL
\subsection{AMOR Two Theta}
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AMOR is SINQ's new reflectometer. It has the peculiar feature that the
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two theta movement of the detector is expressed in translations along
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the reflectometer base axis and the detector height. Additionally the
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detector is tilted. The height of two diaphragms has to be adjusted as
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well. And, in polarizing mode, the analyzer has to be operated as
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well. Quite a complicated movement. I fear this module may only be
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useful for AMOR, but may be, other reflectometers may profit as well.
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This object implements this complex movement as a virtual motor.
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The following formulas are used for the necessary calculations:
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\begin{eqnarray}
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delta height & = & h_{s} - \sin \alpha \\
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delta x & = & |x_{c} - x_{s}| - R \cos \alpha \\
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omega & = & -2 MOM + 2 SOM \\
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\end{eqnarray}
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with
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\begin{eqnarray}
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h_{s} & = & \tan(2MOM)|x_{c} - x_{s}| \\
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R & = & \sqrt{hs^{2} - |x_{c} - x_{s}|^{2}} \\
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\alpha & = & ATT - 2SOM \\
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\beta & = & 180 - 90 - 2MOM \\
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MOM & = & polarizer \omega \\
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SOM & = & sample \omega \\
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x_{c} & = & counter position \\
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x_{s} & = & sample position\\
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\end{eqnarray}
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The same equations hold true for the calculations of the diaphragm
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heights, just replace the distances. The equations for the analyzer
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are not yet known.
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Due to this complicated movement this module needs to know about a lot
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of motors and a lot of parameters. The distances of the various
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components need to be modified at run time in order to allow for
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configuration changes. These are not motorized but must be entered
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manually.
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\subsubsection{Data Structures}
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Consequently data structures are complex. The first data structure
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used is an entry in an array of motors to start:
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@d putput @{
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typedef struct {
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pMotor pMot;
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char pName[80];
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float fTarget;
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}MotEntry, *pMotEntry;
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@}
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\begin{description}
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\item[pMot] is a pointer to the motors data structure.
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\item[pName] is the name of the motor to start.
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\item[fTarget] is the target value for the motor.
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\end{description}
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The next data structure is the class data structure for amor2t:
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@d amoredata @{
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typedef struct __AMOR2T {
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pObjectDescriptor pDes;
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pIDrivable pDriv;
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pMotor aEngine[MAXMOT];
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MotEntry toStart[MAXMOT];
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int iStart;
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ObPar *aParameter;
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}Amor2T;
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@}
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\begin{description}
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\item[pDes] The standard SICS object descriptor.
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\item[pDriv] The drivable interface. The functions defined for the
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drivable interface implement most of the work of this class.
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\item[aEngine] An array of pointers to the motor data structures this
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class has to deal with. The proper initialization of this is taken
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care of during the initialization of the object.
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\item[toStart] An array of motors to start when all calculations have
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been performed.
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\item[iStart] The number of valid entries in toStart.
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\item[aParameter] An array of parameters for this object.
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\end{description}
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\subsubsection{The Interface}
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The interface to this module is quite primitive. Most of the
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functionality is hidden in the drivable interface. So there are only
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functions for interacting with the interpreter.
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@d amorinterface @{
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typedef struct __AMOR2T *pAmor2T;
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int Amor2TFactory(SConnection *pCon, SicsInterp *pSics, void *pData,
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int argc, char *argv[]);
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int Amor2TAction(SConnection *pCon, SicsInterp *pSics, void *pData,
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int argc, char *argv[]);
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void Amor2TKill(void *pData);
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@}
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@o amor2t.i @{
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/*--------------------------------------------------------------------------
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A m o r 2 T . i
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Internal data structure definitions for Amor2T. For details see amor2t.tex.
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DO NOT TOUCH! This file is automatically created from amor2t.w.
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Mark Koennecke, September 1999
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----------------------------------------------------------------------------*/
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@<putput@>
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@<amoredata@>
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@}
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@o amor2t.h @{
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/*-------------------------------------------------------------------------
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A m o r 2 T
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A class for controlling the two theta movement of a reflectometer.
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Especially the AMOR reflectometer at SINQ. For details see the file
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amor2t.tex. DO NOT TOUCH! This file is automatically created from amor2t.w
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with nuweb.
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Mark Koennecke, September 1999
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---------------------------------------------------------------------------*/
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#ifndef AMOR2T
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#define AMOR2T
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@<amorinterface@>
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#endif
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@}
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