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    An open-source camera system for experimental measurements

    Year: 2021

    Journal: SoftwareX, Volume 14, JUN

    Authors: Miikki, Kim; Karakoc, Alp; Rafiee, Mahdi; Lee, Duck Weon; Vapaavuori, Jaana; Tersteegen, Jennifer; Lemetti, Laura; Paltakari, Jouni

    Organizations: Academy of Finland SUPER-WEAR project [322214]; Research Fellowship at the School of Electrical Engineering; Academy of Finland BESIMAL project [334197]

    Keywords: Raspberry Pi; Digital image processing; Non-contact optical measurements; Open-source initiative

    We present an affordable, yet accurate and modular camera system solution developed on Raspberry Pi 4/4 GB platform with Raspberry v2.x and HQ camera modules with 8 and 12.3 megapixels still resolutions, respectively. The system uses freely available Python scripts and libraries for digital image processing and non-contact optical measurements under MIT licenses as a contribution to the open-source initiative. Several investigations were conducted with the present system, which were two-dimensional (2D) digital image correlation (DIC) for the displacement and strain analysis, the kinetic analysis of the photoisomerization of the spiropyran (a model system for a time-dependent chemical reaction yielding molecules with differing color with respect to starting material) with timelapse photography, lap shear tests with the assistance of high-speed image capturing and contact (wetting) angle measurements with still images and time-lapse photography. These studies show that the camera system, setups and scripts can be confidently integrated into the chemical, physical and mechanical tests. (C) 2021 The Author(s). Published by Elsevier B.V.
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