Feedback control of ejection state of a pneumatic valve-controlled micro-droplet generator through machine vision

Fei Wang; Jiangeng Li; Yiwei Wang; Weijie Bao; Xiao Chen; Hui Zhang; Zhihai Wang

doi:10.1117/12.2522946

15 March 2019 Feedback control of ejection state of a pneumatic valve-controlled micro-droplet generator through machine vision

Fei Wang, Jiangeng Li, Yiwei Wang, Weijie Bao, Xiao Chen, Hui Zhang, Zhihai Wang

Author Affiliations +

Proceedings Volume 11041, Eleventh International Conference on Machine Vision (ICMV 2018); 110410L (2019) https://doi.org/10.1117/12.2522946
Event: Eleventh International Conference on Machine Vision (ICMV 2018), 2018, Munich, Germany

Abstract

Pneumatic valve-controlled micro-droplet ejection is a printing technique that has potential applications in many fields, especially in the field of bio-printing. The ejection is controlled by a solenoid valve being briefly turned on, so that high pressure gas enters the liquid reservoir, forming a gas pressure pulse, forcing the liquid out through a tiny nozzle to form a micro-droplet. For bio-printing applications, the bio-inks are typically non-standard. The difficulties are not only that the initial working parameters are difficult to set, but also the working conditions change over time in many cases. In order to maintain a stable single-drop ejection state, a machine vision based ejection monitoring was designed to obtain the number, positions and sizes of the droplets for each ejection, and a feedback control is realized by adjusting the conduction time of the solenoid valve or the gas pressure at the front end of the solenoid valve.

Citation Download Citation

Fei Wang, Jiangeng Li, Yiwei Wang, Weijie Bao, Xiao Chen, Hui Zhang, and Zhihai Wang "Feedback control of ejection state of a pneumatic valve-controlled micro-droplet generator through machine vision", Proc. SPIE 11041, Eleventh International Conference on Machine Vision (ICMV 2018), 110410L (15 March 2019); https://doi.org/10.1117/12.2522946

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