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Aspheric reflectors

Off-axis high-order aspheric primary mirrors

Name Inspection item Inspection result Inspection item Inspection result
Off-axis high-order aspheric primary mirrors 690 Outer diameter φ689.900mm Distance of location hole 450mm
Center thickness 75.0394mm Top's radius of curvature(R) 3153.6264mm
Edge thickness 92.3mm K value -1.0691
Edge thickness difference 0.0395mm Off-axis distance 651.8182mm
Platform width 3.5mm Clear aperture 665mm
Diameter of location hole 20.07mm Finishment 80/50S&D
Depth of location hole 34.96mm Roughness 0.8nm
TOP of location hole 0.0320mm Surface flatness precision RMS:0.0185λ
Coating requirement 0.4um~0.5um:96.259%:0.5um~0.6um:96.029%:0.6um~1.2um:97.695%;1.2um~2.5um:98.169%:2.5um~14um:98.475%。

Surface flatness precision value:

SiC coaxial parabolic primary mirrors



Name Inspection item Inspection result Inspection item Inspection result
1236mmSiC primary mirror Flatness of surface A 0.0500mm Coaxiality between center hole and outer circle φ0.0413mm
Outer roundness 0.0145mm Diameter of reflecting surface φ1220.37mm
Outer diameter φ1236.0636mm Flatness of ground reflecting surface 0.0082mm
Perpendicularity between outer circe and surface A φ0.0129mm Parallelism between ground reflecting surface and surface A 0.025mm
Outer cylindricity 0.0329mm Effective clear aperture φ1200mm
Center hole diameter φ289.9617mm Top's radius of curvature (R) 3000.2688
Perpendicularity between center hole and surface A φ0.0019mm Aspherical coefficient K -1.00005
Cylindricity of center hole 0.0111mm Coaxiality between reflecting surfaces optical axis and outer circle φ0.1000mm
Total thickness 130.08、130.00、130.06、130.03

Surface flatness precision value:

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