Table of Contents
Sensors, Volume 19, Issue 3 (February-1 2019) – 312 articles
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Cover Story (view full-size image) Printable electronics (PE) allow for the low-cost and high-volume production of customized [...] Read more. Printable electronics (PE) allow for the low-cost and high-volume production of customized electronics devices, which makes PE appealing to a wide range of industries. However, for the fabrication of PE devices at an industrial scale, an in-line quality control tool has to be developed. Following the idea of a color control bar for traditional graphic art printing, we developed a quality control bar made from a terahertz vortex phase plate (VPP) that is able to follow the printed ink condition during production. We experimentally demonstrated by terahertz time-domain spectroscopy that the transmission response of VPP as a function of ink conductivity is consistent and more repeatable than conventional conductivity measurements, e.g., four-point probe. Our results open the door for a simple, non-destructive evaluation strategy for PE devices manufacturing in real-time and in a contactless fashion. View this paper.