Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.apo.nmsu.edu/arc35m/Instruments/ARCTIC/Development/ImagerPDR/Assembly.pdf Дата изменения: Thu Dec 5 20:44:30 2013 Дата индексирования: Thu Feb 27 21:01:33 2014 Кодировка: Поисковые слова: messenger

The Instrument
· · · · · · Baffling Coa3ngs Assembly Moths Lab Tes3ng Commissioning


NA2 Baffle
· · The NA2 baffle will need to be modified The baffle will need to be opened up to allow the 10.8' diameter field through


Instrument Baffles

·

There are three knife edged surfaces inside the instrument ­ Entrance port ­ Back of shuIer housing ­ Op3cal Tensioner


Coa3ngs
· Dewar ­ Main components Nickel plated ­ Stainless steel components either Nickel plated or electro polished ­ Interior wall of lens cell will be Aeroglazed (if I can get even coa3ng thicknesses) Instrument housing will be anodized then Aeroglazed on the interior Detents, filter wheel drive mechanics and filter wheel pcb housing will be Nickel plated Rotator latching components will be leT bare stainless steel Exterior ­ The exterior of the instrument will either be black or shiny silver ish in color ­ The main purpose is for aesthe3c reasons but choosing the proper coa3ng will decrease wear on the instrument Interior Performance ­ All interior surfaces that can be painted will be painted with Aeroglaze to reduce any light scaIering

· · · ·

·


Assembly

· · ·

·

AIach components to moun3ng plate AIach moun3ng plate to assembly test stand Assemble individual components ­ Dewar ­ Dewar cage ­ ShuIer ­ Filter wheel system AIach pre assembled systems to front moun3ng plate


Lets look at the Assembly


Moth proofing
· Will this instrument be moth proof? ­ No, Can anything really be moth proofed? · Open entrance in front of instrument · Moving parts inside instrument · Purge air will help · Few electrical components inside instrument to generate heat · Sealed cover over front moun3ng port when instrument not in use


Lab Tes3ng
· Dewar ­ Pump down before Nickel coa3ng to determine baseline ­ RGA analysis ­ Long pump down aTer Nickel coa3ng to determine outgassing rate, cryo pumping capability, and ion pump stability ­ Temperature stability of dummy CCD Filter wheel ­ Test filter wheel repeatability with different filter loads and instrument posi3ons ­ Calibrate the stepper motor offsets with hall affects ShuIer ­ Life3me degrada3on tes3ng (run un3l repeatability starts to decline) ­ Failure mode analysis (what could cause it to fail) Instrument ­ Assembly and Measurements ­ Does everything fit together and s3ll work as expected? ­ Integra3ng sphere tests in lab ­ CCD Characteriza3on ­ Filter and op3cal throughput measurements with flats ­ Photometric accuracy using assembled instrument

·

·

·


Commissioning
· Planned / Requested 3me on sky ­ 1 half night > 2 days off > 2 adjacent half nights ­ Op3mis3c schedule if dewar does not need to be opened ­ If dewar needs to be opened then a week needs to be added between runs ­ Discuss schedule over run in Schedule Sec3on Planned tasks ­ Instrument block ­ Instrument performance · Throughput by looking at standards (should get comparable SPICam data the previous engineering run) · Limi3ng magnitude ­ look at some faint standards · Op3cal proper3es across field ­ look at globular cluster or move star across field ­ ARC User Science

·