一种采用PIC单片机的摇动频率检测系统

提出了一种基于单片机的焊接电弧摇动频率数字化检测方法及系统。通过步进电动机反复正反向转动使焊接电弧作同频率摇动,再借助槽式光电开关将电动机转动速率转换成脉冲电信号,并采用PIC单片机实时测量该低频开关脉冲电信号周期,计算出电弧摇动频率值送数字化显示。试验结果表明:该系统运行可靠,检测精度高,可方便与数字化焊接设备接口,具有工程实用价值。     

基于TCS230颜色识别传感器的纸币清分机

为了高效、便捷地解决目前银行、公交公司、超市、商场等行业在整理纸币时的问题,在查阅、分析、对比现有的纸币分类系统后,自主设计了一种基于TCS230颜色识别传感器的纸币清分机,该机器在STC89C51单片机的控制下,可以将混叠在一起的多种面额地纸币进行快速、准确的清分,具有结构简单、体积小、操作方便、容易维护等特点。     

基于DSP的欧元水印条码识别系统的研究

水印条码是欧元引进的新防伪点,它携带欧元纸币的特定信息,因此研究出一套准确,快速识别欧元防伪条码的检测方法是有其实际意义和应用前景。本文采用TMS320VC5409数字信号处理器、MSP430单片机为主要器件,基于实现对欧元水印条码进行有效、准确、快速识别的目的,设计一套识别系统。并且对做出的系统电路进行实验研究,对采集到的不同纸币的水印条码曲线进行分析,并将新的面值为50欧元纸币的水印条码采集曲线与其他纸币的采集曲线进行分析比较,计算其相关度。最后结合水印的自身特点,水印条码的退化现象,以及实验条件等方面分析相关度出现较低现象的原因。最后对实验结果的误差进行分析,提出下一步研究的重点。     

一种卧式纸币清分机

现有立式纸币清分机由于高度和体积受到限制,不能拥有多个出钞口,极大地影响了纸币情分的效率。因此,设计了一种卧式纸币清分机。这种卧式纸币清分机机构简单,易于维护,并拥有多个出钞口,可一次性将混杂在一起的不同面额纸币挑选出来。     

红外光通信装置的设计

以LM386和红外光收发对管为核心元件,通过红外光定向传输语音信号,并具有环境温度实时检测功能。该设计中,音频信号经过发射电路转换为光强变化的红外光信号,接收电路接收到红外光,经LM386集成音频运放处理通过扬声器还原成声音。由DS18B20采集环境温度,经单片机STC12C5A60S2数据编码后发射,接收电路接收的红外光信号,经单片机解码后通过LCD液晶显示实时温度。     

磁场刺激诱发肌电信号的采集系统

文章介绍了磁场刺激诱发的肌电信号采集系统的软硬件设计，主要讲述了系统中的滤波放大电路、单片机控制电路等的设计，提出了一种新型的肌电信号检测系统，并对磁场刺激诱发的肌电信号进行了讨论。     

自动取款机纸币序列号图像采集装置的研制

自动取款机(简称ATM)纸币序列号图像的正确采集是ATM纸币序列号自动识别记录装置的关键.研制了一种ATM纸币序列号图像采集装置,包括纸币位置检测单元、纸币序列号图像采集单元、系统存储与控制单元.本论文的关键在于解决了ATM出钞过程中纸币序列号的图像实时采集问题.将所研制的纸币序列号图像采集装置安装在目前流通的一款ATM中,实际运行结果表明,所给出的纸币序列号图像采集方法与装置能够正确采集到纸币出钞过程中的纸币序列号图像,经过适当的参数调整,还可以应用于不同币种和面值、不同出钞速度的ATM中.     

用于音乐治疗的人体脑电检测系统设计

本文介绍了一种基于音乐治疗的人体脑电信号采集和处理系统,该系统可以对人在音乐治疗前后的脑电信号进行采集、处理和分析。系统的检测电极从人的脑部采集信号,通过预处理电路传到单片机控制模块,再采用nRF24L01无线通信模块将采集到的信号传给上位机,上位机程序对脑电信号进行处理、分析、显示。实验表呀,系统能够较好的获取人体脑电信号,数据处理结果显示,有音乐刺激时的脑电信号和无音乐刺激时的脑电信号相比,信号幅值增大、复杂度降低。     

光栅传感器在位移自动测量系统中的应用

介绍一种以单片机为核心的位移自动测量系统,该系统采用光机传感器把被测位移量转变为电信号,经前置放大和电路处理后,送入8031单片机进行综合运算处理后输出,并通过LED显示,文中介绍了整体电路的设计和单片机系统的硬件及软件流程。     

鸡蛋电特性无损检测仪

该检测仪由电极探头、交直流两用放大器、8098最小系统及结果指示4部分组成,以8098单片机为控制主体。用它可从蛋壳外直接采集鸡蛋的生物电信号,并由8098单片机对信号进行分析,指示鸡蛋的品质等级、受精与否和鸡     

基于CAN总线的车身信号采集和通讯系统

设计了基于CAN（Controller Area Network）总线的多路车身传感器信号采集和车身各控制器之间通讯系统。设计电路对车身轮速信号、车速信号、车身加速度信号、扭矩信号进行调理、滤波。并利用两个32位高性能ARM单片机LPC2292实现对其进行处理。通过CAN总线节点将多路信号发送给车身各控制器。各控制器也通过CAN总线相互传递车身的集成信号。系统为车身各控制器集成控制提供了便利。节省了汽车线路。提高了传感器信号处理的可靠性。     

某型机炮模拟器的设计

某型机炮模拟器主要包括单片机电路、电源模块接口、冷气装弹部件等组成,用来模拟机炮与飞机间的电信号传输、冷气工作时序、武器工作时序.     

基于单片机的教室智能节能控制系统设计

基于MCS51单片机的教室智能节能控制系统,以TSAL6200红外发光二极管与TSOP1838红外接收器构成的四路红外测量模块动态统计教室内人数,以光敏电阻构成的两路感光模块感知教室内照度,通过驱动电路,实现基于人数的教室灯具自动开关控制.在充分保证教室照度的前提下,有效节约了电能,并延长了灯具的使用寿命.     

Detection of an infrared near-field optical signal by attaching an infrared-excitable phosphor to the end of a photocantilever

To improve the signal-to-noise ratio of near-field scanning optical microscopy, we propose attaching an infrared-excitable phosphor (IEP) to a photocantilever. One source of noise is the light scattered from locations on the sample surface other than that of the probe tip. By detecting only the light scattered from the tip, we can obtain a near-field optical signal without noise. We attached an IEP particle to a photocantilever to convert infrared light to visible light and we used 1550-nm infrared illumination, so the light scattered from the sample was only infrared. The silicon photodiode of the photocantilever is 10⁶ times less sensitive to infrared light than to visible light. As a result, only the converted visible light from the IEP particle, i.e. the signal containing the near-field optical information from the tip, was detected. We verified that the photocantilever detected the signal in the evanescent light produced by infrared illumination and that the detected signal was the light converted by the IEP. The experimental results show the feasibility of detecting infrared light and not the background light through the use of the IEP.     

轮胎红外测温监测防爆系统设计

基于红外测温技术的轮胎温度检测装置的基本原理和结构特点,实时监测轮胎表面温度分布情况,设计出一套通用的轮胎动态温度检测装置.将四个红外探头安装在轮毂上,将红外探头检测到的温度模拟信号输入模数转换器,转换成数字信号,再将数字信号输入单片机,设计单片机程序,通过单片机处理比较四个数字信号,并判断胎压是否过高,通过液晶显示屏...     

Detection of an infrared near-field optical signal by attaching an infrared-excitable phosphor to the end of a photocantilever

To improve the signal-to-noise ratio of near-field scanning optical microscopy, we propose attaching an infrared-excitable phosphor (IEP) to a photocantilever. One source of noise is the light scattered from locations on the sample surface other than that of the probe tip. By detecting only the light scattered from the tip, we can obtain a near-field optical signal without noise. We attached an IEP particle to a photocantilever to convert infrared light to visible light and we used 1550-nm infrared illumination, so the light scattered from the sample was only infrared. The silicon photodiode of the photocantilever is 10(6) times less sensitive to infrared light than to visible light. As a result, only the converted visible light from the IEP particle, i.e. the signal containing the near-field optical information from the tip, was detected. We verified that the photocantilever detected the signal in the evanescent light produced by infrared illumination and that the detected signal was the light converted by the IEP. The experimental results show the feasibility of detecting infrared light and not the background light through the use of the IEP.     

高频脉冲插值测量扭振及实验研究

转轴的扭转振动测量是对其进行状态检测和故障分析的重要手段,为此,设计了一种基于高频脉冲插值的扭振测量系统。测量方法是通过高精度光栅和红外光电管获取转速信号,再对转速信号进行高频脉冲插值,从而把转速信号转化为高频脉冲数,对高频脉冲数处理后得到转轴的扭振信息。测量系统采用FPGA与单片机相结合的模式,FPGA用于产生高频脉冲、对转速信号插值,并对插值后的信号进行计数,单片机读取计数结果并进行处理。经过实验验证,表明该测量方法有较高的测量精度,并通过理论分析找到了影响系统测量精度的原因。最后对几种常用的电动机进行了测试,测试结果较好地反映了转轴的实际振动情况。     

An in-situ infrared temperature-measurement method with back focusing on surface for creep-feed grinding

In creep-feed grinding research, it is vital to measure surface temperature of workpiece in order to optimize process parameters, prevent potential thermal damage, improve the surface integrity of workpiece and provide reference for modelling of grinding. Various measurement techniques for grinding temperature have been developed by using thermocouples and infrared radiation techniques. However, some inevitable problems still exist with slow response, strong noise interference and high sensibility to coolants. In order to obtain precise and reliable temperature of workpiece surface during grinding, an in-situ infrared technique is designed by focusing on the back surface of workpiece. With the help of a two-dimensional sliding table, the focus of infrared thermometer can be adjusted to the small hole in the workpiece to measure grinding temperature accurately. This method can avoid the high-frequency signal interruption of mechanical vibration and electrical noises, since the measurement is contactless and has signal shielding. The procedures to set up the measurement facility and measure grinding temperature are described in this paper. This paper also includes the analysis of measurement results of grinding temperature. Compared with other measurement techniques, this method is not affected by mechanical vibration and grinding fluids. By using infrared technology, this method can measure accurate grinding temperature with a fast response.     

基于单片机和上位机的温湿光照在线监测系统

以STC12C5A60单片机为核心,设计了一种测量环境温度、湿度、光照强度的方法:各传感器测量的数值,经过相应的转换后送到单片机中进行处理,用户可以通过上位机实时观测环境数据.针对湿度测量过程中出现的不稳定现象,提出了切实可行的解决方案;对光照强度采用新的测量方法,即分档测量的方法,与以往只用单电阻测量相比,极大地提高...     

微尺寸器件光电计数系统设计

介绍一种针对微小器件的光电感应计数系统。采用半导体激光发射器作为光源,经过光学系统形成的最小激光束照射器件,反射光由光电三极管进行光电转换,计数控制使用单片机系统。其电路简单、可靠,可以得出较为准确的测量数据。实验结果证明,该系统能达到较好的计数效果。