基于CIS的智能回弹仪系统
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摘要
回弹仪是一种采用无损检测技术、用于检测混凝土抗压强度的仪器,它是利用回弹仪内部的弹簧来驱动钢锤击打混凝土表面,钢锤被反弹回的距离即回弹值就可用来作为推算混凝土抗压强度的指标,达到检测的目的。回弹仪在建筑物、桥梁等混凝土工程领域中的应用极为普遍。
     目前国内市场上的回弹仪大多为机械式的,检测时需人工目测读取、记录并计算数据,存在误差较大、人为因素影响和效率低等缺点,因此人们开始研究智能式回弹仪系统。国内已开发的智能式回弹仪系统分为电阻式、电容式和光栅光耦式。其中电阻式和电容式分别采用电阻和电容作为位移传感器,建立和位移相应的关系式推算回弹值,误差较大。光栅光耦式是采用图像传感器来获取游标的位置信息,稳定性好且干扰小,但作为回弹仪位置传感器的光电耦合器件线阵CCD,虽然测量精度高,但相应的光学和电路复杂且功耗较大,难以推广。
     本文研究的“基于CIS的智能回弹仪系统”是安徽省教育厅重点科研项目“基于PSD的智能回弹仪系统”的重要组成部分。系统采用接触式图像传感器CIS来获取回弹仪游标的位移信息,具有电路简单、功耗小、精度高、成本低等特点。本文将图像传感器、单片机、无线传输等技术结合起来,使系统更加智能化,使用方便,且可在市场广泛推广。
     系统采用C8051F120单片机来产生CIS的驱动脉冲信号,对CIS的原始输出信号进行差分放大、零点校正和模数转换后,送入单片机进行数据计算得到回弹值,并将回弹值通过无线模块传输到上位机系统中。上位机系统在接收到检测数据后,根据国家标准对数据进行分析判断,并通过人机界面显示数据和输出检测结果。
     实验表明,本系统硬件电路简单,精度高,抗干扰性好,使用方便,功耗小等特点。
Rebound hammer is a kind of nondestructive instrument,which is used to detect the compressive strength of the concrete. When use the rebound hammer's hammer that is drove by spring to impact on the concrete surface,the distance of the hammer rebounded——the value of rebound is as the index of the concrete compressive strength and can achieve the purpose of detecting. This is the operating principle of rebound hammer. The rebound hammer is widely used in buildings,bridges and concrete construction.
     Currently rebound hammers in the market almost are mechanical,which need people to read,record and calculate the data. It is complicated,time-consuming and low efficiency.So people begin to study intelligent rebound hammer system. Intelligent rebound hammer system which have been developed are based on resistance,electric capacity and photo coupler. The rebound hammers based on resistance and electric capacity use resistance and electric capacity as displacement sensor and build the relation to displacement to obtain the rebound value. The two kinds have big error. That based on photo coupler uses image sensor to get the position of the pointer. The method has good stability and anti-interference. But the rebound hammer based on linear CCD has high power dissipation and cost as well as high efficiency and accuracy.
     The paper that intelligent rebound hammer system based on CIS is a important part of intelligent rebound hammer system based on PSD,which is key scientific project of Anhui province. After analyzing the rebound hammer in current market,the paper come up with the intelligent rebound hammer system based on CIS,which obtain the pointer's position by contact image sensor CIS. The system has simple circuit,low power dissipation,high accuracy and low cost. It combines image sensor technology,single-chip with wireless transmission technology to make system more intelligent and convenient. This system can widely used in market.
     The system uses C8051F120 to produce the pulse signal of CIS. Amplify,filter the CIS original output signal and then take the signals into the A/D converter. Then single chip can get the pointer displacement information (the rebound value) through the analysis of the digital quantity that converted by A/D and then send the rebound value to upper computer system by wireless transmission module. Upper computer system analyses the received data according to the national standards and displays the data and testing result.
     Experiments indicate that the system has the advantage of simple hardware circuit , high accuracy , good anti-interference , convenience and low power dissipation.
引文
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