APPARATUS, METHOD, AND PROGRAM FOR EVALUATING DEFECT OF UNDERGROUND STRUCTURE

PROBLEM TO BE SOLVED: To provide an underground structure defect evaluation apparatus capable of accurately evaluating the degree of a defect caused by corrosion. SOLUTION: A probe transmits ultrasonic waves (S201). A receiver is set so that reception may be performed by a second receiving filter (S202). In the case that the second receiving filter has recognized echoes reflected by a corroded section (YES in S203), a memory stores waveform data of the echoes reflected by the corroded section, and a switching section sets the receiver so that reception may be performed by a first receiving filter (S204). When the first receiving filter has received waveform data of reflected echoes (S205), the memory stores the waveform data to evaluate the degree of the defect caused by corrosion (S301). COPYRIGHT: (C)2011,JPO&INPIT