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Cooling of SQUIDs using a Gifford-McMahon cryocooler containing magnetic regenerative material to measure biomagnetism.

Author(s) : FUJIMOTO S., KAZAMI K., TAKADA Y., YOSHIDA T., OGATA H., KADO H.

Type of article: Article

Summary

The authors have constructed a cryostat containing a Gifford-McMahon cycle cryocooler that uses erbium-nickel as a magnetic regenerator and operates two-channel SQUID magnetometers. The intensity of the magnetic noise measured by the SQUID magnetometers in a magnetically shielded room was about 40 pT p-p. Magnetocardiograms were measured in real time using a digital signal process. Auditory evoked fields were successfully measured by averaging 100 patterns from which the magnetic noise had been eliminated by a signal process. N 100 and P 200 peaks were thereby observed with a magnetometer cooled only by a Gifford-McMahon cryocooler for the first time.

Details

  • Original title: Cooling of SQUIDs using a Gifford-McMahon cryocooler containing magnetic regenerative material to measure biomagnetism.
  • Record ID : 1996-1398
  • Languages: English
  • Source: Cryogenics - vol. 35 - n. 2
  • Publication date: 1995/02

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