三丝扭摆微推力在线测量方法及不确定度分析  

On Line Measurement Method of Three-Wire Torsion Pendulum Micro Thrust and Analysis of its Uncertainty

作　　者：宁中喜[1] 范金蕤[1] 

机构地区：[1]哈尔滨工业大学能源科学与工程学院,黑龙江哈尔滨150080

出　　处：《测控技术》2012年第5期45-48,共4页Measurement & Control Technology

摘　　要：介绍了一种利用三丝扭摆在线标定和测量毫牛级微推力的方法,该方法采用扭矩平衡和光杠杆放大的原理,将推力器的微小推力转化为光斑的大位移。为消除环境和热等诸多外界因素的影响,使用了砝码在线标定方法,并分析了其测量不确定度。结果表明,使用该方法后在有效的推力测量范围内合成不确定度最小可达到1.5%。A method for online measuring the micro thrust of the order of mN with a three-wire torsion pendulum is described.Utilizing the principles of torque balance and optical lever amplification,the micro thrust is transformed into the large displacement of a tiny spot.To eliminate the effect of environment,heat and other external factors,a weight-based online calibrating technique is applied.Analyzing the measurement uncertainty of this method,it is shown that an integrated uncertainty can reach 1.5%of the minimum in the range of the valid thrust.

关 键 词：三丝扭摆 微推力测量 在线标定 不确定度 

分 类 号：TB93[一般工业技术—计量学]