Abstract
High-speed rotary communication links exhibit high complexity and require challenging assembly tolerances. This article investigates the use of optical wireless communications (OWC) for on-axis rotary communication scenarios. First, OWC is compared with other state-of-the-art technologies. Different realization approaches for bidirectional, full-duplex links are discussed. For the most promising approach, a monolithic hybrid transmitter-receiver lens is designed by ray mapping methodology. Ray tracing simulations are used to study the alignment-depended receiver power level and to determine the effect of optical crosstalk. Over a distance of 12.5 m m , the lens achieves an optical power level at the receiver of − 16.2 dBm to − 8.7 dBm even for misalignments up to 3 m m .
Highlights
IntroductionData transmission over rotating parts is required in a broad range of applications such as wind turbines [1], industrial communications [2,3], surveillance radars [3,4,5,6,7], military [2,8], aerospace [9] and many more
Reliable, real-time connectivity is the backbone of industrial automation
optical wireless communications (OWC) use optical emitters like light emitting diode (LED) or laser diodes (LDs) at the TX to convert an electrical signal into the optical domain
Summary
Data transmission over rotating parts is required in a broad range of applications such as wind turbines [1], industrial communications [2,3], surveillance radars [3,4,5,6,7], military [2,8], aerospace [9] and many more. Due to mechanical contact they suffer wear and tear which limits their durability [1,2,5,6,9,10,11] and increases maintenance costs. Life times of several hundreds of revolutions are common and rotation speeds in the order of magnitude of rpm or even rpm are reached with contactless methods
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