A measurement of the efficiency of CMOS sensors in smartphone cameras to cosmic ray muons is presented. A coincidence in external scintillators indicates the passage of a cosmic ray muon, allowing the measurement of the efficiency of the CMOS sensor. The observed flux is consistent with well-established values, and efficiencies are presented as a function of the number of photo-electrons collected from the CMOS silicon photodiode pixels. These efficiencies are vital to understanding the feasibility of large-scale smartphone networks operating as air-shower observatories.
@article{arxiv.2107.06332,
title = {Measurement of Smartphone Sensor Efficiency to Cosmic Ray Muons},
author = {Jeff Swaney and Michael Mulhearn and Christian Pratt and Chase Shimmin and Daniel Whiteson},
journal= {arXiv preprint arXiv:2107.06332},
year = {2021}
}