Superconductive quantum fluxmeter—superconductive quantum magnetometer with external feedback

✍ Scribed by Vladimír Zrubec; Anton Urban

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 743 KB
• Volume: 37
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/s0011-2275(97)00077-5

✦ Synopsis

In this article transfer and noise parameters of superconductive quantum magnetometers with external feedback functioning as superconductive quantum fluxmeters (SQFs) are analysed. From the derived relationships it follows that they are capable of measuring magnetic flux acting on superconductive coils with unknown geometrical structure, and unknown inductance and size parameters. The data on high input impedance of fluxmeters of this type are specified. Relationships are derived referring to the connection between inductive (typically (0.1 t IO) H) or resistive ( -(0.1 + 100) fi) nature of the input impedance of electronic unit (EU) SQFs and transfer parameters of their complete feedback loop. Simple methods permitting utilization of SQFs for the measurement of inductance of superconductive coils in situ in cryogenic environments in the range -(1O-gs IO-') H are presented.