Fiber optic sensor for angular position measurement: application for an electrical power-assisted steering system

Nicolas Javahiraly; Ayoub Chakari

doi:10.1117/12.2017953

31 May 2013 Fiber optic sensor for angular position measurement: application for an electrical power-assisted steering system

Nicolas Javahiraly, Ayoub Chakari

Author Affiliations +

Proceedings Volume 8720, Photonic Applications for Aerospace, Commercial, and Harsh Environments IV; 87200U (2013) https://doi.org/10.1117/12.2017953
Event: SPIE Defense, Security, and Sensing, 2013, Baltimore, Maryland, United States

Abstract

To achieve a very effective automotive power steering system, we need two important data, the angular position of the wheel and the torque applied on the shaft by the driver of the car. We present a new accurate optical fiber angular position sensor connected to an automotive power steering column. In this new design, the sensor allows the measurement of the angular position of a car steering wheel over a large and adjustable range (± several turns of the wheel). The wheel rotation induces micro-bending in the transducer part of the optical fiber sensing system. This system operates as an amplitude modulation sensor based on mode coupling in the transducing fiber in the case when all the modes are equally excited. We study the sensor response both theoretically and experimentally with a multimode step index optical fiber [r_f (fiber radius) = 300 μm; r_c (core radius) = 50 μm; n_c (core index) = 1,457; N.A. = 0, 22 and the wavelength is 632,8 nm at the ambient Temperature (20°C)]. We show that the sensitivity can be controlled as a function of the sensor's length. We compare modeling and experimental validation and we conclude with a perspective on what could soon be an industrial sensor.

Citation Download Citation

Nicolas Javahiraly and Ayoub Chakari "Fiber optic sensor for angular position measurement: application for an electrical power-assisted steering system", Proc. SPIE 8720, Photonic Applications for Aerospace, Commercial, and Harsh Environments IV, 87200U (31 May 2013); https://doi.org/10.1117/12.2017953

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