Package: Optical Adjustments

Description:  The AT Control Software provides high-level coordination functions to perform a number of optical alignment tasks. They will be invoked by the VLTICS-ISS in coordination with the control of other VLTI sub-systems located in the Interferometric Lab. (e.g. pupil sensor, image sensor, Instruments, etc.).

Note:It is recognised that the exact sequence/procedure contained in the Use Cases for Internal Calibrations (Calibrate M6/Coude, calibrate Az axis, check STRAP pupil) may be modified after the first experience with the system. As a consequence and to avoid lost effort, it is agreed to proceed as follows:

1. Make sure that we will have in the first version of the ATCS (to be ready for the ESO tests at AMOS on AT#1) the possibility to perform "manually" the procedure by sending individual sub-system commands.
2. During the Tests at AMOS, elaborate the exact sequence/procedure.
3. Implement the "automatic" (single command) calibration procedures for the first integration/test period of AT#1 at Paranal. These procedures will be implemented in the first place as OSF templates.
4. Some Use Cases contain provision to use FAS and/or FSS to do alignment. It's under investigation where this option is really needed and where only one subsystem is sufficient.

Package name: opt

Inheritance: Standard Package

Deployment:  AT Control Workstation: atosfControl process and OSF templates

Use Case diagram: 

Class diagram: 

Architecture: 

This coordination package is responsible for the control of optical devices which participate in the alignment procedures.

The following commands are dedicated to the optical alignment of the telescope:

• PREPIAL: Prepare for Image Alignment
• GP2BEAC: Guide Probe to Beacon
• OFFSGPB: Offset Guide Probe on Beacon
• STOPIAL: Stop Image ALignment
• PREPPAL: Prepare for Pupil Alignment
• STOPPAL: Stop Pupil Alignment
• PREPDAL: Prepare for Delay Constant Alignment
• STOPDAL: Stop Delay Constant Alignment
• PREPFOC: Prepare for VLTI Focus Adjustment
• STOPFOC: Stop VLTI Focus Adjustment
• CALM6: Calibrate M6 versus Coudé Sensors
• CALAZ: Calibrate Az axis
• STRPAL: Check STRAP Pupil Alignment
• ADJCOUD: Abjust Coudé Focus

These PREPxxx commands are initiating each an alignment procedure, that remains active until the explicit STOPxxx completion command is received.

In addition, the command GETDATA is necessary for external software (VLTICS-ISS) to request for data acquisition, using the FAS and/or FSS detectors.

At last, this package provides the command wrappers to the device specific commands to be invoked during the procedure (e.g. chopping the Nasmyth Wheel around its alignment tool center position):

• M2: SETFPOS, SETCPOS, SETTILT
• M6: SETTILT
• M10: SETTILT
• NFD: SETPATH

Command Definition Table:  atoptControl.cdt

Reuse from VLT TCS: New package

Issues to be Determined or Resolved: None

Last modified: Mon Feb 25 13:18:59 UTC 2002