基于线阵图像传感器的新型空间滤波测速仪  

Novel spatial filtering velocimeter based on a linear image sensor

作　　者：何鑫[1] 周健[1] 聂晓明[1] 龙兴武[1] 

机构地区：[1]国防科学技术大学光电科学与工程学院,湖南长沙410073

出　　处：《红外与激光工程》2014年第12期4117-4122,共6页Infrared and Laser Engineering

基　　金：国家自然科学基金(61308060)

摘　　要：为了实现对固体表面运动速度的高精度测量,建立了一套基于线阵图像传感器的新型空间滤波测速仪系统,提出了一种确定系统误差来源的新方法。图像传感器在系统中既作为探测器又作为空间滤波器使用,系统结构得到了很大的简化。在理论上对线阵图像传感器的空间滤波特性进行了分析,并设计了图像传感器的驱动电路、信号采集和预处理电路。测量了由高精度转台作为主动轮的传送带速度和日光灯的发光频率。实验结果表明,传送带速度测量精度在0.77%以内,11 min内的测量不确定度为0.66%;而在不使用成像系统的条件下直接测量日光灯的发光频率时,测量不确定度在0.056%以内,提高了一个数量级。总之,该测速仪能够基本满足传送带表面运动速度测量的实时、非接触、稳定和高精度等要求。In order to realize the velocity measurement of moving solid-surface,a novel spatial filtering velocimeter based on linear image sensor was established and a new method was proposed to ensure the error source of the system.The image sensor was employed both as a detector and as a pair of differential spatial filters so that the system was simplified.The spatial filtering characteristics of the linear image sensor were investigated theoretically and the driving circuit and the signal acquiring and preprocessing circuit were designed.The velocity of a conveyor belt using a high-precision turn table as the driving wheel and the radiating frequency of a lamp were measured.The experimental results show that the measurement error of velocity of conveyor belt was within 0.77% and the measurement uncertainty within 11 minutes was 0.66%;the radiating frequency of a lamp was measured under the condition of no imaging system,and the measurement uncertainty turned out to be 0.056%,which was an order better.In a word,the velocimeter can satisfy the requirements of non-contact,real-time,high precision and high stability velocity measurement of a conveyor belt.

关 键 词：固体表面速度测量 线阵图像传感器 空间滤波测速仪 电路设计 误差来源 

分 类 号：TN247[电子电信—物理电子学] O43[机械工程—光学工程]