Methods for measurement of inkjet-printed drop speed at various precision levels were proposed in a draft international standard by IEC TC119: Printed Electronics WG3 - Equipment. These are reviewed and discussed for feedback by NIP31/DF2015.
Stephen D Hoath, "Standardization Of Inkjet Drop Speed Measurement Methods For Printed Electronics" in Proc. IS&T Int'l Conf. on Digital Printing Technologies and Digital Fabrication (NIP31), 2015, pp 129 - 134, https://doi.org/10.2352/ISSN.2169-4451.2015.31.1.art00029_1