A position-sensitive detector for the advanced LIGO suspensions

Lockerbie, N. (2006) A position-sensitive detector for the advanced LIGO suspensions. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. ISSN 0168-583X (Unpublished)

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Abstract

A simple optical displacement sensor consisting of an infrared LED source, a photodiode detector, and an occluding 'flag', has been investigated for potential use in the Advanced LIGO gravitational wave detectors. A number of different commercially available LEDs and photodiodes were tried in the displacement sensor, and an optimal pair was found. A surprising geometrical effect was noted which allowed the residual noise level to be reduced at low frequencies, permitting a displacement sensitivity of ~10-10 m/√Hz to be attained at and above frequencies in the region of 2 Hz.