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超导磁体在降温及通电情况下将受到热及电磁应力,拟采用电阻应变片测量CFETR CS模型线圈在降温及通电过程中产生的应变。为了修正温度和磁场对电阻应变片的影响,采用惠斯通电桥法补偿应变片由于温度及磁场引起的偏差,并实际测量了316L不锈钢样品从室温降到液氦温度的热收缩值,测量结果与ITER数据库数值进行了对比、分析,并研究了磁场对应变测量信号的影响,结果表明惠斯通电桥法能够修正温度和磁场对应变测量的影响,并达到测量的精度要求,可以用于CFETR CS模型线圈的应变测量。
Superconducting magnets will experience thermal and electromagnetic stresses when cooled and energized. Resistance strain gauges are intended to measure the strain of the CFETR CS model coil during cooling and energizing. In order to correct the influence of temperature and magnetic field on the resistance strain gauges, Wheatstone bridge method was used to compensate the strain caused by temperature and magnetic field, and the actual shrinkage value of 316L stainless steel from room temperature to liquid helium was measured. The results show that the Wheatstone bridge method can correct the influence of temperature and magnetic field on the measurement of strain and meet the requirement of measurement accuracy and can be used in CFETR Strain measurement of CS model coils.