【摘要】：穩(wěn)定性是光譜儀器重要指標(biāo),其影響因素較多。為了滿足自制PISA-S近紅外光譜穩(wěn)定性分析的要求,設(shè)計(jì)光譜儀工作參數(shù)的同步監(jiān)測(cè)系統(tǒng),為確定光譜儀器的穩(wěn)定性影響因素、提高光譜儀器的穩(wěn)定性提供依據(jù)。本文根據(jù)PISA-S光譜儀的結(jié)構(gòu)和工作過程,分析了影響光譜儀穩(wěn)定性的因素,確定了同步監(jiān)測(cè)系統(tǒng)的監(jiān)測(cè)參數(shù)和指標(biāo);采用STM32單片機(jī)和上位機(jī)控制,設(shè)計(jì)了具有實(shí)時(shí)同步多參數(shù)監(jiān)測(cè)、數(shù)據(jù)記錄分析和存儲(chǔ)功能的同步監(jiān)測(cè)系統(tǒng)。系統(tǒng)包括光源供電、傳感器制冷、信號(hào)解調(diào)3個(gè)監(jiān)測(cè)模塊,各模塊以一個(gè)STM32單片機(jī)為底層控制單元,通過串口與上位機(jī)進(jìn)行通訊,傳輸數(shù)據(jù)和指令。光源監(jiān)測(cè)模塊包括電壓/電流采樣單元、AD轉(zhuǎn)換單元、光照度以及溫度測(cè)量單元,通過單片機(jī)+PC機(jī)控制計(jì)算實(shí)現(xiàn)供電信號(hào)(電壓/電流)、光照度、環(huán)境溫度3個(gè)參數(shù)的測(cè)量。傳感器制冷監(jiān)測(cè)模塊包括阻抗匹配單元和AD轉(zhuǎn)換單元,通過測(cè)量光譜儀制冷單元中傳感器熱敏電阻阻值經(jīng)單片機(jī)計(jì)算得到制冷溫度。信號(hào)解調(diào)監(jiān)測(cè)模塊包括檢測(cè)信號(hào)整形單元和信號(hào)檢測(cè)單元,通過定時(shí)器的輸入捕獲功能實(shí)現(xiàn)檢測(cè)信號(hào)和參考信號(hào)頻率、占空比以及相位差測(cè)量。同步監(jiān)測(cè)系統(tǒng)通過單片機(jī)外部中斷獲取光譜儀工作狀態(tài)信號(hào),實(shí)現(xiàn)光譜儀工作參數(shù)同步測(cè)量。經(jīng)系統(tǒng)測(cè)試和應(yīng)用實(shí)驗(yàn),同步監(jiān)測(cè)系統(tǒng)實(shí)現(xiàn)了對(duì)PISA-S光譜儀光源供電信號(hào)(電壓/電流)、光照度、環(huán)境溫度、傳感器制冷溫度、檢測(cè)信號(hào)和參考信號(hào)的頻率、占空比、相位差8個(gè)參數(shù)的同步測(cè)量,并滿足設(shè)計(jì)指標(biāo)。
[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.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TH744.1

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