嵌入式时栅传感器高精度激励设计  

High-Precision Excitation Design Method for Embedded Time Grating Sensor

作　　者：王婷[1,2] 彭东林[2] 武亮[2] 陈锡侯[2] 

机构地区：[1]重庆理工大学机械工程学院,重庆400054 [2]机械检测技术与装备教育部工程中心,时栅传感及先进检测技术重庆市重点实验室,重庆400054

出　　处：《传感技术学报》2015年第12期1812-1817,共6页Chinese Journal of Sensors and Actuators

基　　金：国家自然科学基金项目(51127001;51475063);国家863高技术研究发展计划项目(2012AA041200);国家重大科研仪器设备研制专项项目(2013YQ20893);重庆科委项目(yykf B70003);“两江学者”专项资金项目

摘　　要：介绍了嵌入式时栅传感器的基本原理,分析了两相激励信号不一致性主要是幅值不等和相位不正交对传感器测量精度的影响。基于DDS原理结合反馈控制设计了高精度的激励信号模块,采用反馈电路控制可程控放大电路调理两相信号幅值,实现了激励信号的幅值相等,基于闭环反馈控制直接修改数字激励信号实现了信号的相位正交。实验研究结果表明,采用这种闭环控制的方法,传感器短周期测角误差从±65″降低到±16″左右,常值误差基本消除,传感器精度大幅度提高。The basic principle of embedded time grating sensor was introduced,and the influence of accuracycaused by two excitation signals with variable amplitudes and non-orthogonal phases was analyzed. Based on DDSand feedback control the excitation signal generator with high precision was designed. The programmable-gain am-plifier was used to modulate the amplitude of two excitation signals,which achieved equal amplitude,and the orthog-onal signals were realized through the feedback control method. The experimental results show that the short-perioderror has been reduced from ±65″ to ±16″,and the constant error has been basically eliminated by using this closedloop control method. The accuracy of the sensor have been greatly improved.

关 键 词：嵌入式时栅传感器 高精度激励 DDS 可程控增益放大电路 闭环控制 

分 类 号：TP302[自动化与计算机技术—计算机系统结构]