Multi-DM™ User Manual Section 10 - Reference Information
BMC Document Number: DOC-0009 Rev. 5.2 Page 53
10.5.2 The Active Aperture
The Active Aperture (AA) is the largest circular region
that fits within the displaceable controllable area of the DM surface.
10.5.2.1 The Active Aperture for Continuous DMs
For continuous DMs, the Active Aperture is a circle inscribed within the outer
controllable actuators. The area within the Active Aperture is displaceable
but not fully controllable at the edges because the controllable outer actuators
are coupled to actuators further out that cannot be controlled.
The diameter of the Active Aperture is ([actuators across] -1) x [pitch]
Active Aperture (red circle)
overlaid on the actuator map
Surface scan of the
flattened Active Aperture
10.5.2.2 The Active Aperture for Segmented DMs
For segmented DMs, the Active Aperture is a circle inscribed within the outer
controllable segments. The area within the Active Aperture is fully controllable.
The diameter of the Active Aperture is [actuators across] x [pitch]
Active Aperture (red circle)
overlaid on the actuator map
Surface scan of the
flattened Active Aperture
112
101 89 76 63 50 37 25 14
123
113 102 90 77 64 51 38 26 15 5
124 114 103 91 78 65 52 39 27 16 6
125 115 104 92 79 66 53 40 28 17 7 0
126 116 105 93 80 67 54 41 29 18 8 1
127 117 106 94 81 68 55 42 30 19 9 2
128 118 107 95 82 69 56 43 31 20 10 3
129 119 108 96 83 70 57 44 32 21 11 4
130 120 109 97 84 71 58 45 33 22 12
131
121 110 98 85 72 59 46 34 23 13
122 111 99 86 73 60 47 35 24
112 101 89 76 63 50 37 25 14
123 113 102 90 77 64 51 38 26 15 5
124 114 103 91 78 65 52 39 27 16 6
125 115 104 92 79 66 53 40 28 17 7 0
126 116 105 93 80 67 54 41 29 18 8 1
127 117 106 94 81 68 55 42 30 19 9 2
128 118 107 95 82 69 56 43 31 20 10 3
129 119 108 96 83 70 57 44 32 21 11 4
130 120 109 97 84 71 58 45 33 22 12
131 121 110 98 85 72 59 46 34 23 13
122 111 99 86 73 60 47 35 24
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