Platform motions

Oct07

Intro:

The platform will move because of temperature, tiedown tensions, weight distribution, and oscillations. We can measure the platform motion using theodolites (surveys), tilt sensors in the dome, distomats, tiedown tension, and pointing error. The links below show some of these measurements. The links are also available through the optics, pointing, td hardware links.

Topics

Focus curves measured by tracking sources and moving the platform.
Pointing errors as we move the platform (vertically and rotations)
Pitch, roll, and focus using theodolite and tilt sensors to compute the tiedown correction.
Modeling the platform translations and rotations as we move the dome in az and za.
Platform oscillations
Surveying the dome position from AO9
Tilt sensor measurements(from dome)

Individual measurements

190918: pointing errors summer 2019 from platform tilts
120618: pointing error as we pull the platform down vertically
120606: pointing error as we rotate the platform (using td12).
070418: Platform motion as ch za moves 2 to 20 deg.
070415: Mapping platform Rotation to Sky rotation.
0501xx: standing waves measured by moving the platform with the tiedowns.
0312xx: platform corner height vs greg za when az pointing at tower.
02xxxx:Tiedown tensions vs:platform height,temperature, and tiedown Position. Data and fits
02xxxx:Td inches/platform inch, TdPos vs temp at platform focus position.
020729:Platform tilt while td tracking on (do the td's move together).
0108xx: Horizontal offset of platform relative to AO9 monument.
010413: platform motion as we pull uniformily on the 3 tiedowns.

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