ULTRASONIC NONDESTRUCTIVE INSPECTION DEVICE AND ULTRASONIC NONDESTRUCTIVE INSPECTION METHOD

摘要

PURPOSE: An ultrasonic non-constructive inspection device and an ultrasonic non-constructive inspection method are provided to extract a non-linear signal component and apply a time reversal method to the non-linear signal component, thereby accurately detecting non-linear defects. CONSTITUTION: An ultrasonic non-constructive inspection device comprises a first ultrasonic sensor(110a), a first signal unit(150), a second ultrasonic sensor(110b), a second signal unit(160), a third signal unit(170), a third ultrasonic sensor(110c), a fourth ultrasonic sensor(110d), and a fourth signal unit(180). The first ultrasonic sensor radiates ultrasonic waves of first signals toward an object. The first signal unit is connected to the first ultrasonic sensor, thereby controlling a signal input/output of the first ultrasonic sensor. The second ultrasonic sensor receives second signals in which the first signal is reflected by a boundary surface or defects of the objects. The second signal unit is connected to the second ultrasonic sensor, thereby controlling the signal input/output of the second ultrasonic sensor. The third signal unit extracts waveforms of the non-linear component from the second signals and reversal-processes the extracted non-linear component. The third ultrasonic sensor is connected to the third signal unit and radiates the third signals generated by the third signal unit to the object. The fourth ultrasonic sensor receives fourth signals in which the third signals penetrate through the object. The fourth signal unit is connected to the fourth ultrasonic sensor and detects the defect existence or a defect position by reading the peak amplitude of the fourth signals.