【摘要】 为了实现检测系统的便携化、小型化和较强的数据处理能力,结合ARM 11嵌入式处理器和LabVIEW数据处理平台,设计并实现了一种嵌入式中红外差分甲烷检测系统。在软件方面,选用S3C6410作为主处理器、WinCE作为嵌入式操作系统,采用Platform Builder工具对该系统的内核文件进行裁剪定制以及移植安装;采用具有较强数据处理能力的LabVIEW作为数据处理平台,通过Touch Panel模块编写并生成可直接运行于WinCE系统的应用程序来处理传感信号。在硬件方面,选用双通道集成传感器IR12GJ,其输出的两路传感信号经前端电路放大和滤波处理后,由数据采集卡对其进行采集并传输给LabVIEW软件程序,经数据处理后获得甲烷浓度。基于所集成的系统,开展了气体标定、误差测量以及系统稳定性实验。实验结果显示,本系统对甲烷气体浓度的检测范围为0~6.5%,对12种气体样品的相对检测误差小于10%。对浓度为0.5%的气体样品进行了长达4小时的稳定性检测,除个别突变点外,最大误差为8.3%。本文所设计的检测系统结合了嵌入式系统体积小以及LabVIEW数据处理能力强的优点,从而具有较好的应用前景。更多还原

【Abstract】 In order to realize a portable and miniaturized methane（CH₄）detection system with strong data processing ability,combined with ARM11 embedded processor and LabVIEW data processing platform,an embedded mid-infrared differential methane（CH₄）detection system is implemented.In terms of software,S3C6410 is selected as the main processor,and WinCE is chosen to be the embedded operation system（OS）;Platform Builder tools are used for customizing the kernel files of the OS,and transplanting and installing the OS;LabVIEW with strong data processing ability is used as the data processing platform.Through the Touch Panel module,aprogram that can run directly on the WinCE OS is compiled for processing the sensor signal.In terms of hardware,a dual-channel integrated sensor IR12GJ is adopted.A data acquisition card is used to sample the two sensor signals after amplification and filtering by apre-processing circuit,then the two signals are supplied to the LabVIEW software program,and finally the CH₄ concentration is achieved after data processing.Experiments are carried on the aspects of gas calibration,relative error and stability based on the integrated system.Experimental results reveal that the measuring range on CH₄ is 0.6.5%.The maximum relative detection error on 12 CH₄ samples is less than 10%.The experimental result on a CH₄ sample with a concentration of 0.5% for 4 hshows that the detection error is less than 8.3% without considering some individual mutation points.Due to advantages of small size of the embedded system and strong data processing capability of LabVIEW,the reported detection system has wide application prospects.更多还原