Ultrasonic flaw detection device

An ultrasonic flaw detection device comprising:

• an ultrasonic probe to generate ultrasound waves corresponding to transmission signals to be provided to the ultrasonic probe and send out the ultrasound waves into a specimen, and receive echoes of the respective ultrasound waves having propagated through the specimen and output the received echoes as reception signals;
• a processor to execute a program;
• and
• a memory to store the program, when executed by the processor, perform processes of,
• generating, as the transmission signals, signals that are used by the ultrasonic probe to send out the ultrasound waves to the specimen obliquely at a respective plurality of angles;
• and
• determining, from the reception signals, amplitudes of the echoes corresponding to the plurality of angles, and periods of time from when the respective ultrasound waves are sent out until the respective echoes are received, as reception times, and identifying a location of an acoustic discontinuous portion in the specimen from the reception times and a ratio between the amplitudes of the echoes corresponding to the plurality of angles,
• wherein the identified location indicates that the acoustic discontinuous portion is on one of a front-side and a back-side of the specimen.