基于T矩阵的光压加速度计的光阱力研究

光压加速度计作为新型悬浮类加速度计,对惯性微球所受光阱力的理论研究提出了更高的要求。对单轴双光束光压加速度计的工作原理进行了分析,并采用T矩阵方法对光压加速度计中的惯性微球在任意一轴所受到的光阱力进行数值模拟,比较了在不同主要参数下的光阱力捕获效率的差异,最后对光压加速度计的灵敏度进行了优化分析,得出了10-7 g/μm加速度的测量灵敏度。理论分析和模拟计算表明,T矩阵的方法可以实现快速和较为精确的光阱力的仿真与计算;同时,基于单轴双光束的光压加速度计方案可以得到较高的测量精度。

Research on Optical Trapping Force in the Light-Force Accelerometer Based on T-Matrix

As a new kind of accelerometer,light-force accelerometer needs more significant theory of optical trapping force used to capture inertial particles.In this paper,the working principle of one-dimensional dual-beam trapping apparatus was demonstrated and numerical analysis for inertial particles of LFA was conducted by using T-matrix method.And also the trapping efficiency of optical trapping force under condition of different parameters was compared.At last,the results of LFA's sensitivity with 10-7 g/μm were obtained.Theoretical analysis and simulation show that T-matrix can be used to simulate and calculate the optical trapping force quickly and accurately,meanwhile,the plan of three-dimensional LFA can achieve a high measuring accuracy of acceleration.