Abstract
Superconducting quantum interference device (SQUID) sensors are used to sense changes invarious physical quantities, which can be transformed into changes in the magnetic fluxthreading the SQUID loop. We have developed a novel SQUID array dc current sensor. Thedevice is based on a series array of identical dc SQUIDs. An input signal current to bemeasured is coupled tightly but non-uniformly to the SQUID array elements. The inputsignal coupling to the individual array elements is chosen such that a single-valued,non-periodic overall voltage response is obtained. Flux offsets in the individual SQUIDswhich would compromise the sensor voltage response are avoided or can be compensated.We present simulations and experimental results on the SQUID Array for Dc(SQUAD) current sensor current sensor performance. A dc current resolution of<1 nA in a measurement bandwidth of 0–25 Hz is achieved for an input inductance ofLIn<3 nH.
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