Radiofrequency superconductor magnetometer

A point-of-contact superconductor magnetometer was developed. A point-of-contact superconductor magnetometer or SQUID (superconducting quantum interference device) consists essentially of a superconducting cylinder interrupted by a weak link coupled to a resonating circuit at a frequency of about 20 MHz. The operating priciples of this device are outlined. The circuit for the instrument, its operating characteristics, and its performance are described. The application of the device in the field of medicine, biophysics, and gravitational wave detection is indicated.