Digital micro-laboratory application using surface acoustic wave devices
* Presenting author
Droplet manipulation is one of the important applications of surface acoustic wave (SAW) devices. When a sensor is fabricated on the droplet manipulation surface, a digital micro-laboratory for droplet manipulation, mixing, and measurement is realized on a piezoelectric substrate. For optimum droplet manipulation, it is necessary to clarify the acoustic streaming caused by the SAW in droplets. We have discussed droplet manipulation mechanism, experimentally. For optimum control of the droplet, it is necessary to measure the droplet position. When the SAW was generated by the short burst wave, reflected and transmitted signals were observed. The origin of the signals is the longitudinal wave propagation in the droplet. Therefore, it is possible to determine the droplet position with the signals. For the droplet position measurements, the longitudinal wave velocity of the droplet is known. If the droplet position is known and the velocity is unknown, it is possible to measure the velocity of the droplet using the SAW device. This is a unique measurement method of a longitudinal wave velocity of droplets.