A new multi-element rf SQUID system and its application to the magnetic vector gradiometer

✍ Scribed by K. Shirae; H. Furukawa; K. Kishida

• Publisher: Elsevier Science
• Year: 1981
• Tongue: English
• Weight: 392 KB
• Volume: 21
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(81)90213-7

✦ Synopsis

In the rf SQUID system, the rf voltage of the L-C resonant circuit is modulated periodically by the magnetic flux applied to the SQUID element. The voltage change of the resonant circuit is typically of the order of 10/aV. Some devices have been reported to enhance the voltage output)'2 We have found that the voltage output can be enhanced in proportion to the square root of the SQUID elements coupled to the resonant circuit. 3

This paper describes a rf SQUID system, which has only one rf amplifier and many rf SQUID elements coupled to a single rf resonant circuit. In this system, the separate input flux signals applied to every rf SQUID element can be detected separately and simultaneously.

The principle of operation and some fundamental characteristics of the new multi-element rf SQUID system and its application to a vector magnetic gradiometer are described.