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Signal detection in l/f noise of SQUID magnetometersIt is shown that the variance on the SQUID power spectrum in the l/f low frequency region is well behaved, i.e., any small frequency band may be treated as white noise in standard power spectrum estimation theory. Specifically a calibration signal is examined at 0.017 Hz with an equivalent energy referred to the SQUID input coil of 1 times 10 to the -30th J and a digitally recorded and analyzed record of 140 hr duration obtained an optimum S/N better than 400. The results are in good agreement with theory. In addition no deviation from the l/f dependence of the noise energy spectrum is seen down to frequencies below 10 to the -5th Hz. A commercially available SQUID and electronics system were used.
Document ID
19800036779
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Cabrera, B.
(Stanford Univ. CA, United States)
Anderson, J. T.
(Stanford University Stanford, Calif., United States)
Date Acquired
August 10, 2013
Publication Date
January 1, 1978
Subject Category
Instrumentation And Photography
Meeting Information
Meeting: Future trends in superconductive electronics
Location: Charlottesville, VA
Start Date: March 23, 1978
End Date: March 25, 1978
Sponsors: U. S. Department of Energy, NSF, U, S, Navy
Accession Number
80A20949
Funding Number(s)
CONTRACT_GRANT: NAS8-32355
Distribution Limits
Public
Copyright
Other

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