Measurement of sub-nanoradian angular movements

Adrian Cruise

Research output: Contribution to journalArticle

Abstract

A method is described for measuring small angular movements, some as small as a few tens of a picoradian, and results are presented from two applications. The method uses a linear conducting probe nominally orthogonal to the electric field in a microwave cavity. By pumping the cavity with microwave power large electric fields are generated and the linear probe detects these in a homodyne system with very high sensitivity to the angle between the field and the probe. The first application is a dc investigation of field rotation caused in a lossy waveguide by a ferrite sample and achieves a sensitivity of a few microradians. The second example is the angular rotation of electric fields in a gravitational wave detector which has a target sensitivity of picoradians and operates at 100 MHz.
Original languageEnglish
Pages (from-to)941-944
Number of pages4
JournalMeasurement Science and Technology
Volume18
DOIs
Publication statusPublished - 1 Mar 2007

Keywords

  • gravitational wave detector
  • angular movement
  • microwave detector
  • ferrite
  • angular measurement
  • picoradians
  • electromagnetic field rotation

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