طراحي و ساخت روبشگر فراصوتي جهت تهيه تصاوير روبش B-Scan ) B ) از قطعات صنعتي

DESIGN AND CONSTRUCTION OF AN ULTRASONIC SCANNER FOR OBTAINING B-SCAN IMAGES FROM INDUSTRIAL PARTS

The results of ultrasonic tests are usually displayed as A-scan signals. In an A-scan signal, reflections of ultrasonic wave form different reflectors are shown as sharp echoes on a time by amplitude display. Interpretation of these echoes can sometimes be quite difficult and usually requires knowledgeable and experienced specialists. There exist other methods of displaying the ultrasonic testing results one of which is the B-scan image. On a B-scan image detection and sizing of defects is much easier compared to an A-scan signal. In order to construct a B-scan image, one needs to use a scanner and continuously collect ultrasonic signals from different point on the motion path of the scanner. In this paper, a special scanner is built for construction of B-scan images from ultrasonic testing of plate butt welds. This scanner is used for producing B-scan images from specimens in which certain reflectors are implanted. The results indicate that the system can accurately identify and measure the embedded reflectors.