Title :
Micro gap measurement by vibration mode for needle-type dispenser
Author :
Hirose, Kazuki ; Irie, Yuuka ; Hirata, Shinnosuke ; Aoyama, Hisayuki
Author_Institution :
Dept. of Mech. Eng. & Intell. Syst., Univ. of Electro-Commun., Chofu, Japan
Abstract :
A needle-type dispenser, consists of a thin needle and a glass capillary, has been developed for micro-droplet application from high viscosity liquids. A gap, which is a distance between the needle tip and the target surface, is formed in micro-droplet. If the gap is fluctuated, volumes of applied micro droplets are unstable. Therefore, a contact-detection method of the needle-tip droplet and the target surface is proposed. The needle is vibrated by the piezoelectric element through the leaf spring in the proposed method. Contact of the needle-tip droplet and the target surface can be detected from needle-vibration characteristics. In this paper, control of the gap and droplet volume using needle-vibration characteristics is reported.
Keywords :
displacement measurement; drops; mechatronics; needles; vibration measurement; glass capillary; micro gap measurement; needle-tip droplet; needle-type dispenser; piezoelectric element; thin needle; vibration mode; Frequency measurement; Frequency response; Needles; Resistance; Resonant frequency; Springs; Vibrations; micro gap control; needle vibration; needle-type dispenser; piezo actuator; resonance frequency;
Conference_Titel :
Mechatronics and Automation (ICMA), 2011 International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-8113-2
DOI :
10.1109/ICMA.2011.5985721