微张力测量模型设计与实验研究

对差分结构的霍尔式张力测量模型进行了研究,基于线性霍尔元件和悬臂梁设计了挠度参变量和转角参变量两种微张力测量模型.应用悬臂梁系统将待测张力转换为位移和转角的变化,并以它们为中间参变量,建立了张力与霍尔电压的线性关系,实现了用线性霍尔元件以磁敏的方式测量张力.模型的对称互补式设计,不仅抵消了非线性变量对测量的影响,还能提高信号输出幅度.模型的差分式电压输出,能够抑制共模干扰和零点漂移.两种模型均能实现单一线性变量测量,实验结果符合理论结论.对比实验研究表明,挠度参变量微张力测量模型的灵敏度和线性度均优于转角参变量微张力测量模型,论述了设计原理并给出了理论计算.

Design and Experimental Study of Micro-tension Measurement Models

The differential structure of the Hall-type tension measurement model was studied, Deflection parameter and Angle parameter micro-tension measurement model based on the linear Hall element and the cantilever. Cantilever system can transform test tension to corner and displacement changes. A linear relationship is set up between a tension and the Hall-voltage using the changes as a parameter. Finally a magnetic measurements of tension by linear Hall element is Realized. Complementary symmetry design of the model, not only offset the impact of non-linear variables, but also improves the range of signal output; Differential voltage output of the model can suppress common mode interference and zero drift. Both of two models are able to realize a single linear variable measurement, and the experimental results in line with the theoretical conclusions. Experiment shows that in sensitivity and linearity, deflection parameter model of micro-tension measurement are superior to the corner parameter model of micro-tension measurement. The design principles are discussed and a theoretical calculation is given to prove it.