Direct Visualization of High-Intensity Focused Ultrasonic Field Using Light-Emitting Diodes and Piezoelectric Elements
This paper presents a tool with a light-emitting diode (LED) connected to a piezoelectric ceramic element for directly visualizing an intense ultrasonic field. The piezoelectric element generates electric voltage proportional to the ultrasonic pressure applied to the element; the LED is then turned on by the voltage. The sound pressure is directly observed as light intensity of the LED by human eyes. This paper first explains the basic structure of the sensor device. Several methods to utilize the sensor are then presented. Second, visualization of a focused field excited by a concave transducer working at 500kHz is demonstrated using an array version of the proposed sensor.
Key wordsVisualization LED Piezoelectric ceramics PZT Focused ultrasonic field Array Concave transducer
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