HTS-SQUIDS AND RELATED INSTRUMENT MODELS MADE IN ROMANIA

When Polushkin and Vasiliev [V.N. Polushkin and B.V. Vasiliev, Investi gation of rf SQUID behavior at liquid nitrogen temperature, Modern Phy s. Lett. B, 3 (17) (1989) 1327] announced a HTS Zimmerman type SQUID, we had a laboratory technology for making niobium SQUIDs. The easy and less expensive capability of producing temperatures of about 80 K tem pted us to follow the suggested method and we succeeded in making some HTS-SQUIDs. A technological research was developed undertaken and, as a result, a pretty good material for making SQUIDs was obtained. In o rder to characterize the SQUIDs, a PC based testing system was underta ken. A dedicated software was developed. The system structure, the mai n characteristics and some relevant results are presented. A digital-a nalog flux meter model using HTS-SQUIDs as a transducer is now in use. Its characteristics are summarised in this paper. (C) 1997 Elsevier S cience S.A.