一种新结构介观压光型微加速度计

A new structure accelerometer based on Meso-Piezoptic

对镜像异质三周期光子晶体的研究理论表明,在实际应用范围内,透射率与光子晶体所受的轴向应力呈简单的线性关系。据此,设计一种能实现微梁直拉直压的加速度计,微梁很小很敏感,处于轴向直拉直压位置时,能极大提高结构的灵敏度和自由振动频率。以镜像异质三光子晶体替代以往的压敏电阻,只需检测其透射率,即可得出加速度大小。最后结果表明:当透射光强改变1酃时,该结构可以感知小于0.4mgn的加速度的变化,测量量程可达3.2gn。

Theoretical study about mirror shows, in application range, transmissivity has a simple linear relationship with the axial stress to photonic crystal. Accordingly, a new structure accelerometer with axially deformed tiny beams was designed. Tiny beams are sensitive, so the sensitivity and frequency of free vibration of the structure will be increased significantly when tiny beams were in axial position. Using mirror triply periodic photonic crystal replace the original pressure sensitive resistor as the sensing element. Detecting the transmissivity of the photonic crystal, the magnitude of the acceleration can be calculated. It is shown that this structure can measure less than 0.4 mgn when the transmissivity intensity changes one out of 1？ and its measuring range is up to 3.2 gn.