DC-squid based displacement sensor for a mössbauer RED-shift experiment

Erkki Ikonen, Heikki Seppä, Walter Potzel, Christian Schäfer

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review


A superconducting quantum interference device (SQUID)-based displacement sensor with resolution up to 3*10/sup -15/ m/ square root Hz in the frequency band of 20 Hz-15 kHz is reported. The sensor monitors the Doppler modulation of gamma radiation in a gravitational red-shift experiment using the 93-keV Mossbauer resonance of /sup 67/Zn. Test results for the SQUID and the PZT transducer used in the experiment are presented. The relative statistical uncertainty in the determination of the gravitational red shift is about 3% for a one-week experiment. Preliminary results obtained with the displacement sensor show that the systematic uncertainties that are related to the Doppler motion generated by the velocity drive are negligible compared to the statistical uncertainty.
Original languageEnglish
Title of host publicationCPEM'90 Digest
Subtitle of host publicationConference on Precision Electromagnetic Measurements
EditorsGary R. Hanes
Place of PublicationNew York
PublisherIEEE Institute of Electrical and Electronic Engineers
Publication statusPublished - 1990
MoE publication typeA4 Article in a conference publication
EventCPEM'90: Conference on Precision Electromagnetic Measurements - Ottawa, Canada
Duration: 11 Jul 199014 Jul 1990



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