• Sensor Electronics dimensions (W x H x D): 450 mm x 101 mm x 136 mm. Our latest development – the Fiber-Optic Current Sensor – is a perfect demonstration of the leaps intechnology which can result from our research. ABB's innovation has been to apply this technology to a current-sensing device, in place of the. The FOCS Series Fiber Optical Current Sensors are passive, all-dielectric devices designed for precise current measurement without metal components, making them immune to electromagnetic interference noise. Our advanced fiber optical technology and patented closed-loop system ensure accurate, reliable, and long-lasting performance. Superior Performance: Immune. Our global manufacturing network for fiber optic sensors in Ayabe (Japan), Shanghai (China) and Nufringen (Germany) focuses on continuously optimising methods for small and large volume production, applying stringent quality control procedures, and expanding production portfolio and flexibility to. rinciples and techniques in depth. The aim of the SPIE Field Guides is to distill this information, providing readers with a handy desk or briefcase reference that provides basic, essential information about optical princi-ples, techniques, or phenomena, including definitions and descriptions, key.