the temperature, l is the thermal conductivity, DH SL is the latent heat of solidification, f L is the liquid fraction, d is

We have developed a new magnetic Sensor Using a rotational magnetic field with a three-axis search coil for non-destructive testing(NDT). Using specimens with a machined crack in the center, we investigated the relationship between the position and the depth of a crack and the output signal of the three-axis search coil. The results of our experiments,.t;his sensor can clearly detect a crack existine on the revers e side of the sensine surface. In coil positioned orthogonal over the x-axis searchcoil. Each-=is search coil has 700 turns, The z-axis coil is a pamik"kpe Coil which outer radius is 1~" and thickness i s 1 " .It has 2oo-tums nXi& of 0 . 0 4~ Copper Wire. order to obtain large output signals, x-and y-axis search coils have an amorphous core( 1 x 7 x 7 m 3 ) . 0 " this paper, we present the construction, results of numerical analysis and experimental results of this sensor.

No abstract

No abstract

No abstract