摘要
基于红外光谱的吸光度理论，以单片机为核心控制红外光发射和检测电路，实现了甲烷气体在线检测分析的设计方案。微控制器及其外围电路对红外光源进行电调制。被调制后的红外光源产生一定频率的红外光。红外光穿过一定浓度的气体敢部分吸收后到达红外光检测器。红外光检测器对红外光进行检测后产生徽电压信号输出给运算放大器，最后经过放大后的电压信号送给AD芯片进行采样。微控制器根据采样后的AD值计算出吸光度，并由微控制器对数据进行处理得出甲烷体积分数值。给出了该仪器的软、硬件设计方案，检测标准为：检测体积分数0～100％，最小检测体积分数0．01％，测量误差为±3％。样机测试体积分数误差为±3％，表明该在线分析仪能对甲烷气体进行准确有效的分析，达到了预期设计目标。
Based on the theory of infrared spectra absorbance,the single-chip microcomputer was the core to control infrared light emission and detect circuit,thus achieving the detection design of volume fraction of methane gas.Microcontroller and its peripheral circuits can electrically modulate infrared light source,then the modulated infrared light generates the infrared light of a certain frequency.The infrared light passes through the gas of a certain concentration and is partly absorbed,then reaches the infrared light detector,the infrared light detector generates a micro-voltage signal to the operational amplifier after detecting the infrared light,finally sends it to AD chip for sampling by the amplified voltage signal.The microcontroller calculates the absorbance in accordance with the sampled AD,and the microcontroller processes the data and obtains methane volume fraction value.The paper gave the hardware and software design of the instrument and its testing standards are:detecting volume fraction:0 to 100%,the minimum volume fraction:0.01%,measurement error:± 3%.prototype testing:error of volume fraction:±3%,indicating that the detector can perform an accurate and efficient analysis for hydrocarbon gases and achieve the expected design goals.
出处
《录井工程》
2013年第4期55-58,85,共4页
Mud Logging Engineering
