1 / 7

the steering mirror control c.cerna demonstrator progress meeting 29/06/2005

This progress meeting discusses the requirements, specifications, and solutions for the KMOS case and the demonstrator case. It covers temperature, vibration, tip-tilt range, pointing accuracy, pointing stability, and coding. The control solutions and costs for the demonstrator case are also discussed.

phillipe
Download Presentation

the steering mirror control c.cerna demonstrator progress meeting 29/06/2005

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. the steering mirror control c.cerna demonstrator progress meeting 29/06/2005

  2. the KMOS case • The more stringent requirements : • Temperature (30 °K) • Vibration (Ariane 5 launch) • Purpose of the prototype : verify the specs. @ cryo conditions : • Tip-tilt range : +/- 2.5° • Pointing accuracy : 1’ • Pointing stability : <= 5” • In terms of coding : • 5°/5” = 3600 steps ~ 12bits

  3. the KMOS case solution adopted in term of control : x2 axis x2 axis Coil INFINEON FP212L100 PC • home made ao board • AD524 ampli op. • U/I ampli : +/-10V, qq mA40 mA • out 2 : +5V, 10 mA stable • ampli op. : g=10 • National Instrument • NI 7342 control board • 2 axis • out : +/-10V, qq mA • in : +/- 10V, 12bits

  4. the demonstrator case The more stringent requirement : control the dithering test at 120 °K

  5. 10 mm 2.5 mm 250 mm X Y the demonstrator case Z stack • Tip-tilt : • qX= +/- 0.258° • qY= +/- 1.15° steering position • pointing accuracy : • dithering : moving a PSF on the slices of a known value to be sure that the image of the PSF on the detector has moved of 1/10 of pixel • 1/10 of IR pixel = 39 mm on the slices  qaccuracy = 33 “ • Absolute accuracy : be able to measure 33” means have an absolute accuracy of about 3”  dqaccuracy ~ 3“

  6. the demonstrator case • in terms of coding : • en x : 0.516°/3” ~ 9bits • en y : 2.3°/3” ~ 11.4bits • in terms of signal amplification : • As the tip-tilt is at least twice lower than in KMOS case, AO gain have to be at least twice higher g~20-50 • in terms of motor power : • As mechanical part is optimised (PEB) one can imagine than 40mA will be enough to move the actuators <12bits

  7. <300€ @ home expensive outside 800€ 500€ NI 7342 1000€ ? ~3000€ demonstrator solutions Coil INFINEON FP212L100 • ao board : • U/I converter • stable alim • ao g~10-100 control 8ch Alim 24V 4ch 16bits an. input alim rack Coil INFINEON FP212L100 • ao g~10-100

More Related