| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydrogen concentration measuring method and a hydrogen concentration measuring apparatus capable of measuring the concentration of hydrogen of tubular members in a short time. SOLUTION: An electromagnetic ultrasonic sensor 2 applies varying magnetic fields to an object to be measured 8. An electromagnetic ultrasonic transmitter/receiver 3 receives axisymmetric SH waves. A control part 4 adjusts the frequency of the varying magnetic fields in such a way that the axisymmetric SH waves may generate resonance. At the detection of the resonance frequency of the axisymmetric SH waves, a resonance characteristics index computation means 5 computes a resonance characteristics index of the object to be measured on the basis of a detected resonance frequency. A hydrogen concentration output means 6 determines and outputs the concentration of hydrogen corresponding to a computed resonance characteristics index of the object to be measured on the basis of the correlation between the resonance characteristics index and the concentration of hydrogen stored in a reference material database 7. COPYRIGHT: (C)2010,JPO&INPIT
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