7.0 IMPLEMENTATION

7.11 OBS mechanisms

OBS mechanisms, grouped by category, are shown in the following tables.
OBS cameras
AcronymDescription
ACAMacquisition camera
DCAMdiagnostics camera
INTdeformable mirror interferometer
NCAMNIRC2 alignment camera
???temporary wavefront sensor
???temporary tilt/focus sensor
OBS two discrete position devices
AcronymDescription
AFMacquisition fold mirror
DFMdiagnostics fold mirror
FSSwavefront sensor field stop stage
IDCSinfrared atmospheric dispersion corrector stage
ISMscience instrument fold mirror (instrument selection mirror)
SFMtelescope simulator fold mirror
SODsodium transmissive dichroic
OBS n (>2) discrete position devices
AcronymDescription
FSPwavefront sensor field stop
IRDinfrared transmissive dichroic
WCSwavefront sensor camera stage[12]
WLSwavefront sensor lenslet stage<Superscript>b [13](3 d.o.f.)
OBS position control devices
AcronymDescription
AFSacquisition camera focus stage
FSMfield steering mirrors (4 d.o.f.)
SFPtelescope simulator field positioner (2 d.o.f.)
SPMtelescope simulator pupil mask
SFStelescope simulator focus stage
OBS motion control devices
AcronymDescription
FCSwavefront sensor focus stage[18]
IDCinfrared atmospheric dispersion corrector prism (2 d.o.f.)
ROTimage rotator
TSStilt/focus sensor XYZ stage (3 d.o.f.)
VDCvisible atmospheric dispersion corrector prism (2 d.o.f.)
WPSwavefront sensor pupil relay lens stage<Superscript>c
OBS analog inputs
AcronymDescription
ENVtemperature sensors (5)
???dew point sensor?
OBS analog outputs
AcronymDescription
???none identified
OBS digital inputs
AcronymDescription
???telescope simulator white light status
???enclosure shutter status
???electronics room overtemp
???e-stop active
???e-stop trip
???enclosure doors open
???overhead lights on
OBS digital outputs
AcronymDescription
NCAMNIRC-2 alignment camera and light source on/off
SWPtelescope simulator white light source on/off[23]
WWPwavefront sensor white light source on/off<Superscript>b
???enclosure shutter open/close

[12] WCS and WLS are correlated: WLS commands will automatically be propagated to WCS
[13] WLS also has a a fine adjustment mode
[18] FCS and WPS are correlated: FCS commands will automatically be propagated to WPS
[23] SWP and WWP may share the same light source
AO Software Design Book - 25 FEB 1997

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