So Kitazawa

DEVELOPMENT OF 3D PHASED ARRAY SYSTEM “3D FOCUS‐UT”

Ultrasonic phased array inspection systems have been used the in various industrial fields recently. For instance, power plants have used these systems to maintain their reliability. The phased array is advantageous because it improves efficiency by imaging the inside of the test subject. This inspection image is obtained by electronic scanning of a focused ultrasonic beam using a phased array sensor. We have developed a 3‐dimensional volume inspection technology to make further efficiency and accuracy improvements in ultrasonic inspections. This study presents the innovative 3D phased array inspection system “3D Focus‐UT” for 3D volume inspection. This system employs (1) a 3D ray‐trace simulator to set up the delay time for the elements in the array sensor and the delay pattern for 3D volume scanning; (2) high sensitivity phased array equipment that has a 256 ch pulsar/receiver to drive/receive a 2D matrix array transducer simultaneously; and (3) high‐speed 3D data processing software. The software conve...

Forward-Biased Cadmium Telluride Detectors with High-Energy Pulse X-ray Sources

Forward-biased Schottky CdTe detectors (In/CdTe/Pt) have been investigated with an electron linear accelerator as an X-ray source, in order to suppress the polarization effect. The forward-biased detectors which have considerably large leakage currents show no gradual decrease in signals with time due to the polarization, while the reverse-biased detectors show a gradual decrease. Moreover, the outputs in the forward-biased state are much larger than those in the reverse-biased state.