13 February 1990 Low Cost Binary Proximity Sensor For Automotive Applications
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Abstract
A fiber optic binary position sensor has been fabricated simply and inexpensively. This sensor exploits the Faraday Effect to detect the presence of a piece of ferrrous metal The sensor is positioned inside a ring magnet, so that when a ferrous metal object passes close to the face of the magnet, it distorts the field, changing the output of the sensor from low optical power to high. The key component is a piece of bismuth doped iron garnet film with an extremely high Faraday Rotation per unit length and a low saturation magnetization. Material properties of this film will be discussed, along with sensor design and performance. This sensor has many potential applications in the automotive industry, such as monitoring door, hood and trunk positions.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
L. B. Maurice, L. B. Maurice, D. H. Crowne, D. H. Crowne, J. R. Harrington, J. R. Harrington, F. G. Hoff, F. G. Hoff, "Low Cost Binary Proximity Sensor For Automotive Applications", Proc. SPIE 1173, Fiber Optic Systems for Mobile Platforms III, (13 February 1990); doi: 10.1117/12.963210; https://doi.org/10.1117/12.963210
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