A position-sensitive detector for the advanced LIGO suspensions

Research output: Contribution to journalArticle

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.

Keywords

  • optical
  • displacement sensor
  • LIGO suspensions
  • gravity
  • nanoscience
  • astrophysics

Fingerprint Dive into the research topics of 'A position-sensitive detector for the advanced LIGO suspensions'. Together they form a unique fingerprint.

  • Cite this