Abstract
In order to cope with the problems such as nonlinearity and machining difficulty of large gratings or long reflector in the field of long-range and high-precision displacement measurement, multi-sensor incremental measurement systems that combining with switching operations among different sensors has proven to be a feasible solution. However, with large numbers of repetitive switching operations, the switching errors and subsequently generated accumulation become one of the main obstacles for achieving excellent performance. In this paper, a novel method is proposed to reduce the switching errors and their accumulation in the incremental displacement measurement systems. The initialization constant of each “to-be” used sensor is derived by analyzing the real-time measurement data of the adjacent sensors over an extended period and is used for the switching operations. By theoretical analysis and simulation experiments, the proposed method can effectively reduce the accumulative errors relative to conventional methods.
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