penetration depth

[‚pen·ə′trā·shən ‚depth] (cryogenics) The depth beneath the surface of superconductor in a magnetic field at which the magnetic field strength has fallen to 1/ e of its value at the surface. (electricity) In induction heating, the thickness of a layer, extending inward from a conductor's surface, whose resistance to direct current equals the resistance of the whole conductor to alternating current of a given frequency. (engineering) The greatest depth in an ultrasonic test piece at which indications can be measured.

单词	penetration depth
释义	penetration depth penetration depth [‚pen·ə′trā·shən ‚depth] (cryogenics) The depth beneath the surface of superconductor in a magnetic field at which the magnetic field strength has fallen to 1/ e of its value at the surface. (electricity) In induction heating, the thickness of a layer, extending inward from a conductor's surface, whose resistance to direct current equals the resistance of the whole conductor to alternating current of a given frequency. (engineering) The greatest depth in an ultrasonic test piece at which indications can be measured.
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