工艺误差对电容式微加速度计温度漂移的影响（英文）  

Effects of fabrication error on thermal drift of capacitive micro accelerometer

作　　者：彭鹏[1,2] 彭倍[1,2] 周吴[1,2] 于慧君[1,2] 曲昊[1,2] 何晓平[3] 

机构地区：[1]电子科技大学机械电子工程学院,成都611731 [2]电子科技大学机器人研究中心,成都611731 [3]中国工程物理研究院电子工程研究所,四川绵阳621900

出　　处：《强激光与粒子束》2016年第6期122-125,共4页High Power Laser and Particle Beams

基　　金：supported by NSAF(U1530132);National Natural Science Foundation of China(51505068,51575090);Fundamental Research Funds for the central universities(ZYGX2013J097)

摘　　要：利用有限元方法,仿真分析了深反应离子刻蚀工艺造成的折叠梁宽度误差对电容式微加速度计温度漂移的影响。在存在工艺误差和保证微加速度计灵敏度恒定的前提下,增大了折叠梁设计宽度,计算了不同宽度下微加速度计的温度漂移量。结果表明:刻蚀工艺误差越大,微加速度计温度漂移量越大。折叠梁设计宽度为4.5μm和6.5μm时,最大温度漂移量分别为2.42mg/℃和1.71mg/℃,因此通过适当地增大设计尺寸,可以有效地减小微加速度计的温度漂移量。Dimension uncertainty inevitably occurs in almost every fabrication of micro structure due to itssmall size and uniformity of material. The dimension error, however, will result in the asymmetry of the sensitive structure. The unsymmetrical structure will change the distribution of the thermal stress when the microsensors are subjected to changed temperature and further impact the thermal stability of devices which is characterized by the quantity of thermal drift. This study investigates the effects of fabrication error on the thermaldrift of a comb capacitive micro accelerometer fabricated by deep reactive ion etching（DRIE） process. The accelerometers with supporting folded beams width error ranging from the ideal layout design to the actual fabricateddimension are modeled to simulate the deformation of sensitive component induced by temperature change. Thethermal drifts are acquired by the calculation of the differential capacitance of the deformed structure. In orderto reduce the thermal drift induced by the fabrication error, the design dimension of the beam width is enlargedunder the premise of constant sensitivity of the accelerometer. The calculated results indicate that the supporting beam fabrication error will significantly affect the thermal drift of the capacitive micro accelerometers and anincreased design dimension of the beam width can improve the symmetry of the sensor, and then reduce thethermal drift.

关 键 词：工艺误差 电容式微加速度计 温度漂移 

分 类 号：O432.12[机械工程—光学工程] TH744.1[理学—光学]