A high precision, compact electromechanical ground rotation sensor

V. Dergachev, R. Desalvo, M. Asadoor, A. Bhawal, P. Gong, C. Kim, A. Lottarini, Y. Minenkov, C. Murphy, A. O'Toole, F. E. Peña Arellano, A. V. Rodionov, M. Shaner, E. Sobacchi

    Research output: Contribution to journalArticlepeer-review

    12 Citations (Scopus)


    We present a mechanical rotation sensor consisting of a balance pivoting on a tungsten carbide knife edge. These sensors are important for precision seismic isolation systems, as employed in land-based gravitational wave interferometers and for the new field of rotational seismology. The position sensor used is an air-core linear variable differential transformer with a demonstrated noise floor of 1×10-11 m/√Hz. We describe the instrument construction and demonstrate low noise operation with a noise floor upper bound of 5.7×10-9rad/√Hz at 10 mHz and 6.4×10-10 rad /√Hz at 0.1 Hz. The performance of the knife edge hinge is compatible with a behaviorur free of noise from dislocation self-organized criticality. © 2014 AIP Publishing LLC.
    Original languageEnglish
    Pages (from-to)054502-1 - 054502-13
    JournalReview of Scientific Instruments
    Issue number5
    Publication statusPublished - 2014


    Dive into the research topics of 'A high precision, compact electromechanical ground rotation sensor'. Together they form a unique fingerprint.

    Cite this