侧壁压阻式力传感器的研制与标定

Design and Calibration of Sidewall Piezoresistive Force Sensor

在对现有微操作中夹持力问题进行分析的基础上,提出了一种基于面内侧壁压阻的力传感器加工方法,成功地在MEMS微夹持器上集成了压阻式的力检测传感器,对夹持力的检测反馈实现了微操作的闭环控制.该方法利用离子注入工艺和深度反应离子刻蚀(DRIE)工艺相结合制作检测梁侧壁压阻,改善了侧壁压阻工艺与其他工艺间的兼容性问题.最后通过压电叠堆驱动平台结合精密电子秤对压阻传感器进行了标定.测试表明,这种微力传感器加工技术可以很好地与其他工艺相兼容,力传感器的灵敏度优于72V/N,分辨率优于3μN.

Some existing problems about gripping force in the micromanipulation were summarized. An effective fabricating sidewall piezoresistor in plane technique was proposed and successfully used to fabricate piezoresistor force sensor in a MEMS microgripper. A closed-loop control of micro-operation was achieved for the detection of the feedback gripping force. The ion implantation technique combined with the deep reactive ion etching （ DRIE） technology was used to fabricate the sidewall sensor. The compatibility of the vertical sidewall surface piezoresistor technique with other micromachining techniques was improved. At last,an electronic scale and a precision voltage meter were used to calibrate the piezorisistive sensor. The experimental results verify that the sensitivity of the fabricated displacement sensors is better than 72 V/N,and the displacement resolution is better than 3 μN.