光谱仪工作状态多参数同步监测系统

发布时间：2018-12-10 15:09

【摘要】：稳定性是光谱仪器重要指标,其影响因素较多。为了满足自制PISA-S近红外光谱稳定性分析的要求,设计光谱仪工作参数的同步监测系统,为确定光谱仪器的稳定性影响因素、提高光谱仪器的稳定性提供依据。本文根据PISA-S光谱仪的结构和工作过程,分析了影响光谱仪稳定性的因素,确定了同步监测系统的监测参数和指标;采用STM32单片机和上位机控制,设计了具有实时同步多参数监测、数据记录分析和存储功能的同步监测系统。系统包括光源供电、传感器制冷、信号解调3个监测模块,各模块以一个STM32单片机为底层控制单元,通过串口与上位机进行通讯,传输数据和指令。光源监测模块包括电压/电流采样单元、AD转换单元、光照度以及温度测量单元,通过单片机+PC机控制计算实现供电信号(电压/电流)、光照度、环境温度3个参数的测量。传感器制冷监测模块包括阻抗匹配单元和AD转换单元,通过测量光谱仪制冷单元中传感器热敏电阻阻值经单片机计算得到制冷温度。信号解调监测模块包括检测信号整形单元和信号检测单元,通过定时器的输入捕获功能实现检测信号和参考信号频率、占空比以及相位差测量。同步监测系统通过单片机外部中断获取光谱仪工作状态信号,实现光谱仪工作参数同步测量。经系统测试和应用实验,同步监测系统实现了对PISA-S光谱仪光源供电信号(电压/电流)、光照度、环境温度、传感器制冷温度、检测信号和参考信号的频率、占空比、相位差8个参数的同步测量,并满足设计指标。
[Abstract]:Stability is an important index of spectrometer, and its influence factors are many. In order to meet the requirements of self-made PISA-S near infrared spectrum stability analysis, a synchronous monitoring system for the working parameters of spectrometer is designed, which provides the basis for determining the influencing factors of the stability of the spectrometer and improving the stability of the spectrometer. In this paper, according to the structure and working process of PISA-S spectrometer, the factors influencing the stability of spectrometer are analyzed, and the monitoring parameters and indexes of the synchronous monitoring system are determined. A synchronous monitoring system with the functions of real-time synchronous multi-parameter monitoring, data recording and analysis and storage is designed by using STM32 single chip computer and upper computer control. The system consists of three monitoring modules: light supply, sensor refrigeration and signal demodulation. Each module uses a STM32 microcontroller as the bottom control unit, communicates with the host computer through serial port, transmits data and instructions. The light source monitoring module includes voltage / current sampling unit, AD conversion unit, illuminance and temperature measurement unit. The power supply signal (voltage / current), light illumination and ambient temperature are measured by the control calculation of single chip microcomputer PC machine. The sensor refrigeration monitoring module includes impedance matching unit and AD conversion unit. By measuring the resistance of sensor thermistor in the refrigeration unit of spectrometer, the refrigeration temperature is calculated by single chip computer. The signal demodulation and monitoring module includes a detection signal shaping unit and a signal detection unit. The detection signal and reference signal frequency duty cycle and phase difference measurement are realized by the input acquisition function of the timer. The synchronous monitoring system acquires the working state signal of the spectrometer through the external interruption of the single chip microcomputer, and realizes the synchronous measurement of the working parameters of the spectrometer. Through the system test and application experiment, the synchronous monitoring system realized the power supply signal (voltage / current), light intensity, ambient temperature, sensor refrigeration temperature, frequency and duty cycle of the detection signal and the reference signal for the PISA-S spectrometer light source, the light intensity, the ambient temperature, the temperature of the sensor, the frequency of the detection signal and the reference signal. The synchronous measurement of 8 parameters of phase difference is carried out, and the design index is satisfied.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TH744.1

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