石英谐振式数字称重传感器

A Digital Quartz Resonator Load Cell

介绍了一种由柔性铰链构成的弹性体结构和 Ａ Ｔ 切型石英谐振器组成的石英谐振式数字称重传感器。通过仔细设计弹性体的结构形式和石英谐振器在弹性体中的位置，可以消除传感器的四角误差，使之象电阻应变式称重传感器一样经过简单的调整就可以作为电子衡器的传感器。由于 Ａ Ｔ 切型石英谐振器在加力方向角约为４０°处存在着力频转换系数温度影响为零的点，利用这一特性可以使传感器的灵敏度温度系数在没有补偿的情况下达到３×１０－ ４／° Ｃ。通过改变柔性铰链的尺寸可以设计不同量程的传感器，并给出了量程为 ２００ Ｎ 的传感器的精度指标。

A digital load cell has been developed utilizing flexible hinges and a precision AT cut quartz resonator as the sensing element.Geometry dimensions of elastic body and position of quartz resonator in elastic body can be designed carefully so that the load cell has no biased load error.Force direction angle is determined to minimize sensitivity temperature shift.Quartz resonator and geometry of flexible hinges are discussed and temperature characteristics of the load cell are presented.A practical design is developed and experimental results are given.