为提高颗粒转速测量范围，提出了双帧频拍摄法，并进行了数学推导和实验验证。
To enlarge measurement range of particle rotational speed, a dual- frequency imaging method was presented, with mathematical analysis and proving experiment.
实验测量了在设计转速下该风机全工作范围的性能参数。
The performance parameters at the design speed are measured in the experiments.
实验结果表明，采用巨磁阻传感器的转速测量系统具有准确度高、测量范围宽、测量间距大等优点。
The experiment result shows that the measuring system with GMR sensor has the advantage of high accuracy, wide measurement range, and distant measurement.
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