1983
DOI: 10.1063/1.1137520
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Optimization of a clip-on SQUID current probe

Abstract: This paper presents details of an unusual clip-on nanoammeter. The device utilizes a toroidal magnetic flux sensor which is split to allow its placement around a continuous current carrying filament, and is coupled to a sensitive superconducting current amplifier. Optimization formulas allow the design of an instrument having the greatest possible signal-to-noise ratio consistent with the physical volume available for the sensing element. A prototype exhibited 125-nA current sensitivity at 25 Hz with a noise l… Show more

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Cited by 13 publications
(3 citation statements)
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“…They were even used to assess an axon damaged at its end [50]. A limitation of this technique is that the nerve needs to be cut and threaded through the toroid, but Mark Leifer and Wikswo developed an openable toroid that avoided any need for dissection [51]. Toroids have been used to evaluate the continuity of a nerve during surgery [52,53].…”
Section: Magnetic Field Of a Nervementioning
confidence: 99%
“…They were even used to assess an axon damaged at its end [50]. A limitation of this technique is that the nerve needs to be cut and threaded through the toroid, but Mark Leifer and Wikswo developed an openable toroid that avoided any need for dissection [51]. Toroids have been used to evaluate the continuity of a nerve during surgery [52,53].…”
Section: Magnetic Field Of a Nervementioning
confidence: 99%
“…11) Although the magnetometer (current probe) was optimized, 12) the noise level (6 pA Hz À1=2 at 1 kHz) of the probe was higher than that of a semiconductor amplifier probe (2.8 pA Hz À1=2 at 1 kHz). 13) Thus, the sensitivity of a current probe using a SQUID in the low frequency band is insufficient for measuring the action potential.…”
Section: Introductionmentioning
confidence: 99%
“…Two excellent papers are available that discuss various aspects of the problem. The first concentrates on the design of room-temperature pickup coil systems 6 and optimization of the SIN ratio, while the second 7 discusses the problems of matching the superconducting flux transformer coil to the SQUID.…”
Section: Apparatusmentioning
confidence: 99%