SQUID Multiplexing Method
Original Publication Date: 1986-Nov-01
Included in the Prior Art Database: 2005-Mar-09
This article relates generally to superconducting quantum interference devices (SQUIDs) and, more particularly, to the multiplexing of such devices. A plurality of magnetometer pick-up coils arranged in parallel can be sequentially sensed by a single SQUID in determining a magnetic field pattern. In the figure, identical pick-up coils L1 and L2, each sensing respective flux fields d1 and d2, are connected in parallel with an inductor L3 whose field is, in turn, sensed by SQUID 4. An output voltage change is detected at terminal V. The current through inductor L3 is the resultant of that due to the effective flux divided by the total effective inductance of all coils. If a portion of the loop containing L1 is driven to the normal or resistive state, the current in that loop becomes zero.