以杠杆悬臂传感梁为基础, 设计了支点可调式称量传感单元, 通过调节支点位置实现不同量程的称量传感灵敏度可调控制, 并且可以实现温度误差补偿.理论分析表明, 结构一定的传感单元, 支点与支座间距离存在临界阈值, 当支座间距离等于该阈值时, 称量传感灵敏度等于零; 随着支座间距离的增大灵敏度逐渐减小并趋向于稳定.实验表明, 在0~200 g的范围内, 称量传感的平均线性度大于0.998, 理论灵敏度与实验灵敏度之间的平均相对误差为6.46%, 可满足不同量程的不同灵敏度的称量应用.

An innovative weighing sensing unit using optical fiber Bragg grating sensors was developed. Based on lever cantilever with an adjustable fulcrum, the weighing range and sensitivity can be adjusted. During the differential operation of the shifts of Bragg wavelength, the shifts of Bragg wavelengths caused by the temperature fluctuation can be compensated. As a result of theoretical analysis, there is a threshold for the value of the distance between the fulcrum and the brace. When this distance equals the threshold, weighing sensitivity will be zero. Experimental results show that the average linearity is larger than 0.998 and the average relative error between the theoretical weighing sensitivity and the experimental weighing sensitivity is 6.46% within the range of 0~200 grams of force.