| 摘要 |
PURPOSE:To obtain the impedance matching device of the ultrasonic inspecting device which easily obtain impedance matching by measuring impedance automatically at the time of the replacement of a probe, etc., comparing an obtained reflection coefficient with a set value, and adjusting the impedance by an adjustable impedance matcher. CONSTITUTION:When the probe 1 is replaced and the frequency of a burst- shaped voltage outputted by a transmitter is varied, a switching element 11 is switched to a terminal S1 and an impedance measuring circuit 12 measures the impedance. The measured value Zr is inputted to a reflection coefficient arithmetic circuit 13 to calculate the reflection coefficient GAMMA at the input terminal of the adjustable impedance matcher 10 according to the impedance of a directional coupler 6 which is stored previously. The reflection coefficient GAMMAis inputted to a comparative arithmetic circuit 15 and compared with a reflection coefficient GAMMAs which is set in a target value setting circuit 14 and the adjustable impedance matcher 10 adjusts the impedance automatically. |
