便携式西瓜振动信号数据采集装置研制  

Development of Portable Data Acquisition Device for Watermelon Impact Signal

作　　者：张生伟[1] 王昌龙[1] 袁挺[1] 於锋[1] 高计超[1] 

机构地区：[1]扬州大学机械工程学院,江苏扬州225009

出　　处：《计算机测量与控制》2009年第11期2314-2316,共3页Computer Measurement &Control

基　　金：江苏省教委基金(06KJB510135);创新基金资助(2007CXJ005)

摘　　要：设计了一种便携式的西瓜敲击音频信号数据采集装置,通过喇叭状拾音口和麦克风对敲击的声音信号进行收集,然后通过仪用放大器对信号放大,通过调节AD620的外置增益电阻的大小来调节放大倍数,再经高速串行A/D转换芯片MCP3202进行A/D转换,转换后的数据由单片机送入片外RAM存储器;选用可串口编程的STC89C52RC单片机来实现对数据的计算和分析,并将测量结果显示在数码管上,最终完成对西瓜振动信号的处理;试验阶段利用PC机进行波形特征分析,采集装置成熟以后系统脱离PC机独自实现数据的采集和处理,并将成熟度测量结果显示在数码管上。A portable data acquisition device was designed to acquisite audio signal data of watermelon impacted. A horn- shaped mouth and a microphone collect the percussion sound signal. An instrument amplifier AD620 is employed to condition the signal, by regula- ting external gain resistors of it to change signal level. A high speed serial A/D converter MCP3202 is used to convert the analog signal to digital. A single chip microprocessor STC89C52RC saves the data to its external RAM. STC89CS2RC can be programmed with serial port. The MCU computes and analyzes the sample data, and indicate the result on the LED, finally perform the processing of watermelon vibra- tion signals. In the first stage, we use PC to analyze the characteristics of waves. After the system finished, it can work on its own data acquisition and processing function, and display the result of maturity on the LED.

关 键 词：单片机 信号放大 A/D转换 西瓜成熟度 

分 类 号：TP274[自动化与计算机技术—检测技术与自动化装置]