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A 'Violin-Mode' shadow sensor for interferometric gravitational wave detectors

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Figure

Figure 1. The aLIGO suspension system for a 40 kg test-mass/mirror comprises four fused-silica suspension fibres, arranged in two pairs the schematic shows only fibre ‘A’ of the (C, A) pair, together with its collimated source of NIR illumination (across t
Figure 2. Diagram showing the profile of a silica fibre’s shadow as it falls across a photodiode (PD) sensor of effective (horizontal) width wshadow is imagined to be offset horizontally from the centre of its PD by a variable amount have depths at the lef
Figure 3. Schematic cross-sectional (plan-) view of a single vertically-orientated split-photodiode based shadow sensor, drawn to-scale
Figure 4. Partial front views of dual shadow-sensor housing C–A, with its front-plate, bearing the two apertures shown in figure removed
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