一种转速遥测仪的数据采集与处理系统  

Design of Data Acquisition and Processing System for Remote Rotation Velocimeter

作　　者：刘全顺[1] 曾祥楷[1] 朱志雄[1] 陈阳[1] 

机构地区：[1]重庆理工大学光电信息学院,重庆400054

出　　处：《仪表技术与传感器》2015年第10期27-29,34,共4页Instrument Technique and Sensor

基　　金：重庆市时栅传感及先进检测技术重点实验室基金(2013TGS006);重庆理工大学研究生创新基金(YCX201303)

摘　　要：根据空间滤波转速遥测原理和数据处理方法,设计了转速遥测系统中的数据采集与处理系统,构建了一个转速遥测仪。用两个平行排列且相距一定距离的光电池阵列构成双空间滤波传感器,双空间滤波传感器输出两个与转速相关的准正弦信号S1和S2。每个准正弦信号通过波形变换转换为两个互补的矩形信号,用可编程计数器8254-2测量矩形信号的高电平脉宽,用高性能微处理器S3C2440采集矩形信号的脉宽计数值,根据矩形信号多个脉宽的平均值求出准正弦信号的中心频率。根据S1和S2的中心频率及其变化计算出旋转中心点位置,再根据旋转中心点位置和S1、S2的中心频率计算出旋转速度并显示。设计结果表明:该数据采集与处理系统能够实现转速遥测仪中多路相关数据的采集与处理。According to the spatial filter velocimetry and its data processing method,the design of data acquisition and processing subsystem for the remote measurement system of rotational velocity,in which a remote rotation velocimeter has been constructed was presented in this paper. Two parallel photovoltaic arrays arranged with a certain interval form a double spatial-filtering sensor（ DSFS） which output two quasi-sinusoidal signals S1 and S2. Each of the two quasi-sinusoidal signals was converted into two complementary rectangular signals by use of waveform transform. The programmable counters of 8254- 2 were applied to measuring the high-level width of the rectangular signals. The microprocessor S3C2440 with high performances was employed to collect the values of the counters. The central frequency of one quasi-sinusoidal signal was obtained by averaging out several high-level widths of the rectangular signal that is from the quasi-sinusoidal signal. The location of the imaged rotational-center of the measured object was determined by the central frequencies and their variations of S1 and S2. Then the rotational velocity was calculated and displayed with the rotational center location and the central frequencies of S1 and S2. The experimental results show that the designed subsystem is able to acquire and process multichannel data in the remote rotation velocimeter.

关 键 词：空间滤波 旋转速度 中心频率 可编程计数器 ARM9微控制器 

分 类 号：O439[机械工程—光学工程]