Sam Hitchman‘s project on developing a laser Doppler vibrometer (LDV) has been published in the European Journal of Physics! This paper lays out the detailed workings, parts, and the design of this device as an open-source (OS) hardware project to measure particle velocities in a non-contacting way. We hope this paper will be the starting point for OSLDVs to be built, used, and improved by researchers around the world!