摘要:
PROBLEM TO BE SOLVED: To provide a method for analyzing a heat receiving state by irradiating the concrete structure on a place burnt down by a fire with a space ultrasonic wave in a non-contact state. SOLUTION: The concrete structure is irradiated with an ultrasonic wave in a non-contact state using an extremely strong ultrasonic wave generator to measure the surface vibration displacement of the concrete structure at this time. Especially the secondary harmonic component in the measured value is analyzed to judge whether the concrete structure has a heat receiving effect. COPYRIGHT: (C)2009,JPO&INPIT