ゲート制御レーザ照射による超音波の発生と無線受信の検証

抄録

Ultrasonic waves generated in a solid by the thermo-elastic effect and ablation of laser irradiation have a wide frequency range. In other words, it is not easy to control the center frequency of the ultrasonic wave because of the pulse-like wave generation. Here, we manage the frequencies in a solid by switching the on/off of the emission gate of a high-repetition-rate laser source. Switching at a fixed time interval generates ultrasonic waves in the range of tens to hundreds of kHz in the solid. It was confirmed that ultrasonic waves were generated in the designed frequency range using the gate switching. Furthermore, the wireless communication device transmitted the received ultrasonic signal to the host PC. We confirmed that the ultrasonic wave can be detected and transmitted more than 3.5 m away from the laser irradiation point.