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Acquisition Camera: Troubleshooting Help. Vern STAHLBERGER Institute for Astronomy August 21-2008. Comments and Purpose: Images not centered in Acquisition TV Camera (problems, especially with CSHELL Create this Document to help with the troubleshooting. Assembly Picture-1.

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Acquisition camera troubleshooting help
Acquisition Camera: Troubleshooting Help

Vern STAHLBERGER

Institute for Astronomy

August 21-2008

  • Comments and Purpose:

  • Images not centered in Acquisition TV Camera (problems, especially with CSHELL

  • Create this Document to help with the troubleshooting


Assembly Picture-1

AO Spool AOK-301

Support Structure AOK-300

Top Plate Cover: AOK-317

George Mount AOK-400

(orange colored)


Assembly Picture-2

X-Y Stage

(yellow colored)


Assembly Picture-3

AO Spool

(partially transparent)


Assembly Picture-4 (Top View)

POM (Pick Off Mirror;

Movable via X-Y Stage

Covers for Acquisition Box removed!

Animatics for X-Y Stage




Collins CCD Camera & Focus Mechanism

Lens Cell AOK-271

Filter Wheel AOE-100

Fold Mount AOK-205 (Movable)

Fold Mount AOK-205 (Fixed)

Apogee CCD Camera & Focus Mechanism


Gimbal Mount Pickoff Mirror: AOK-100

AO Spool

Some parts partially transparent



POM Mechanism without Support Structure

  • Mechanism Description:

  • The Pickoff Mirror Support is a 2-Axis Gimbal Mount Mechanism whose axis are at right angles to each other and are co-planar to the front surface of the Mirror. The nominal angle of the POM is 45 degrees to the incoming beam

  • CCW and CW Rotation is limited to about 2 degrees (stops) in both axis

  • Compression Springs are used to preload Gimbal Frames onto Actuator ends (eliminating backlash)

  • Rotation is accomplished remotely using Newport Actuators (blue cylinders)

  • Note: This mechanism is difficult to service while installed inside the AO Spool. Remove everything up to, but not including X-Y Stage. (see next slides)

  • Checklist:

  • Do Actuator ends remain in contact with the Gimbal Frames at all times? Will require energizing the Actuators to verify

  • Are the Actuators themselves held firmly in place (check screws that hold Actuator Bodies)

  • Check Flex Pivots for breakage; check screws that secures Flex Pivots 8x)

  • Check Mirror Clips 3x (do they hold the POM firmly in place?)

  • For a parts list of Gimbal Mount Pickoff: AOK-100 go to…

  • http://irtfweb.ifa.hawaii.edu/~ao/Mechanical/AO-IRTF/AO-Acquisition-Camera-AOK/Assy-AOK/

a

b

Actuator a-axis

Actuator b-axis


Note: To access these screws disassembly is NOT required to what is shown in this picture!!

Optics Base Plate: AOK-312

Relevant Screws Qty=4

X-Y Stage

George Mount: AOK-400

There are 4x 10-32 Socket Head Cap Screws (SHCS) used to bolt the Optics Base Plate to the X-Y Stage

All of them are accessible by removing the Top Plate Cover AOK-317 (see next slides). Side walls do NOT

have to be removed!


Access to 2x 10-32 SHCS what is shown in this picture!!


Access to 1x 10-32 SHCS what is shown in this picture!!

May need to move motor if not visible


Access to 1x 10-32 SHCS what is shown in this picture!!


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