Direct-coupled First-order SQUID gradiometer for Nondestructive Evaluations

비파괴 평가용 직접결합형 1차 미분형 SQUID gradiometer

  • Published : 1999.08.18

Abstract

We have fabricated the direct-coupled planar type 1st-order SQUID gradiometers. The gradiometer consists of moats or slots in SQUID loop. It is made by YBa$_2Cu_3O_7$ thin films using pulsed laser deposition method on SrTiO$_3$ single crystal and bi-crystal substrates. We have studied the effects of slots and moats in SQUID loop by measuring the voltage modulation signals under uniform field and 1st-order gradient, and the noise properties under non-shielded environment.

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