为完成工程中强磁场、强辐射、小空间等恶劣环境下的扭矩测量，设计并实现基于LabVIEW的容栅扭矩测试系统，通过USB总线将LabVIEW开发的上位机软件与以容栅传感器为核心的测试电路进行连接，测试电路利用转动轴前后两端携带正弦波信号的两组容栅，将对扭矩的测量转换为对两路正弦波信号相位差的测量，上位机软件对大容量的测试数据进行采集与处理。恶劣环境下测量转速在1000~5000 r/min时的转动轴扭角，以理想环境下的扭角测量值作为给定标准值，发现在1000 r/min转速时相对误差最大，且相对误差<6%。结果表明：该测试系统性能稳定可靠，测量准确度高，开发周期短，易于后期维护升级。%In order to measure the torque in project construction under severe environment like high-intensity magnetic field, intense radiation and small space, a capacitive grid torque testing system has been designed and implemented based on LabVIEW. PC software developed by LabVIEW has connected with test circuit with a capacitive grid transducer as its core part via an USB bus. Two groups of capacitive gratings at the front and rear ends of rotation axis are used to convert torque measurement to phase-difference measurement of two sine wave signals. Then,the tested data of large capacity is acquired and processed with the PC software. The torsional angle of rotation shaft is tested at 1 000-5 000 r/min in harsh conditions. The torsion angle tested in an ideal condition was set as standard value. The relative error reached the maximum when the speed is at 1 000 r/min but no more than 6%. The result shows that this test system is stable and reliable with high measurement accuracy, short development cycle, and easy to maintain and upgrade.
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