Abstract
A hight temperature superconducting (HTS) rf-SQUID has been used in non-destructive testing (NDT). A two-hole HTS rf-SQUID is employed as a gradiometer sensor without using flux transformer coils. This gradiometer, maintained at liquid nitrogen temperature, is sensitive to enough to detect small cracks in an aluminum alloy slab covered by an 1″ thick solid aluminum alloy plate, yet it does not need any special magnetic shileding. This application of a HTS SQUID in NDT demostrates one of the important practical usage of high temperature superconductors. It also offers a possibility of solving simultaneously four NDT requirements: sensitivity, penetration depth, resolution, and portability of the device.
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