基于测量基准变换的增量直线式时栅传感器研究
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重庆理工大学 机械检测技术与装备教育部工程研究中心 时栅传感及先进检测技术重庆市重点实验室重庆400054

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TH7

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国家自然基金(51435002,51305478)、重庆市基础与前沿研究计划(cstc2016jcyjA0505)、重庆高校创新团队建设计划(CXTDX201601029)项目资助


Research on incremental linear time grating sensor based on measurement standard transformation
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Chongqing Key Laboratory of TimeGrating Sensing and Advanced Testing Technology, Engineering Research Center of Mechanical Testing Technology and Equipment, Ministry of Education, Chongqing University of Technology, Chongqing 400054, China

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    摘要:

    针对目前绝对直线场式时栅无法满足全闭环数控系统要求的增量式直线位移反馈的问题,采用测量基准转换方式从时间域的角度处理绝对直线场式时栅的空间位移信息,运用时间序列算法分析绝对式时栅采样数据序列的内在相关性,建立自适应递推算法。通过时间触发采样将时栅传感器过去的测量数据作为样本集,递推时栅下一个采样时刻的位移,在下一个采样周期内将直线时栅的绝对位移代表的增量式时间脉冲通过脉宽调制的方式连续发出,实现绝对式直线时栅到增量式直线时栅位移传感器的转换设计。实验表明在76.604 mm的范围内增量式直线时栅位移传感器达到±2 μm的测量精度。此研究可将原绝对式直线时栅位移传感器运用于全闭环增量式直线运动数控系统,具有重要现实意义。

    Abstract:

    Aiming at the problems that current absolute linear magneticfield type time grating displacement sensors do not provide incremental linear displacement feedback for full closedloop numerical control system, in this paper the measurement standard transformation method is adopted to process the spatial displacement information of the absolute linear displacement magneticfield type time grating sensors in time domain. The inherent relevant of the sampling data series of the absolute linear displacement time grating sensor is analyzed using time series algorithm, and the selfadaptive recursive algorithm is established. The measured linear absolute displacement data sampled in timetriggered pattern are employed as sample set, and the absolute linear displacement for the next sampling period is calculated through recursion. Then the incremental time clock pulses represented by the absolute linear displacement of the time grating sensor are sent continuously using pulse width modulation pattern during the next sampling period. In this way, the absolute linear time grating sensor is transformed into an incremental linear one. Experiment results prove that the dynamic displacement measurement error of the proposed incremental linear time grating sensor is within ±2 μm in the range of 76.604 mm. With the proposed method, the absolute linear time grating sensor can be applied for incremental linear displacement feedback required in full closedloop numerical control system.

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陈自然,刘小康,杨继森,李钢.基于测量基准变换的增量直线式时栅传感器研究[J].仪器仪表学报,2017,38(1):91-96

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  • 在线发布日期: 2017-07-20
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