آشکارسازی هم زمان گازهای NO2 و SO2 با استفاده از روش بیناب نگاری نوری جذب تفاضلی

مبشری, ابوالحسن

آشکارسازی هم زمان گازهای NO2 و SO2 با استفاده از روش بیناب نگاری نوری جذب تفاضلی

نوع مقاله : مقاله پژوهشی

نویسنده

ابوالحسن مبشری

استادیار، دانشگاه صنعتی مالک اشتر،تهران، ایران

چکیده

بیناب‌نگاری نوری جذب تفاضلی یک روش برای تعیین غلظت آلاینده‌های گازی محیط است. از این روش برای تعیین غلظت ستون آلاینده‌های جوی در طول مسیرهای طولانی در جو استفاده می‌شود. معمولاً طیف جذبی گازهای مختلف موجود در جو، در ناحیه طیفی فرابنفش – مرئی باهم همپوشانی دارند. طیف جذبی گازهای SO2 و NO2 در ناحیه طول‌موجی nm 290-310 باهم همپوشانی دارند و حضور گاز NO2 باعث بروز خطا در تعیین غلظت گاز SO2 خواهد شد؛ بنابراین، در این مقاله الگوریتمی برای تعیین غلظت دو گاز SO2 و NO2 به روش جذب تفاضلی، به‌صورت هم‌زمان، به کار گرفته‌شده است. برای آزمون الگوریتم موردنظر، یک چیدمان آزمایشگاهی برپا و آزمون‌ها بیناب‌نگاری ‏ انجام‌شده است. در الگوریتم موردنظر، بیناب جذبی گازها به دو بخش کند تغییر و تند تغییر تجزیه‌شده است. بخش تند تغییر بیناب جذب برای آشکارسازی گاز و بخش کند تغییر آن برای تعیین غلظت گاز استفاده‌شده است. چیدمان آزمایشگاهی موردنظر شامل چشمه دوتریوم - هالوژن، سلول تک عبوری با طول cm 22 و بیناب‌نگار است. برای تشخیص غلظت دو گاز، ابتدا غلظت‌های مختلف و معلوم گاز NO2 و سپس گاز SO2 وارد سلول گاز شده و منحنی کالیبراسیون برای این گازها، به‌صورت جداگانه، رسم شده است. سپس غلظت‌های متفاوت از ترکیب گاز SO2/NO2 وارد سلول گاز شده است و منحنی کالیبراسیون برای ترکیب دو گاز ثبت‌شده است. با استفاده از این منحنی‌ها و الگوریتم موردنظر، غلظت دو گاز با دقت 2% تعیین شد. همچنین حد آشکارسازی ppm 8/72 برای گاز SO2 و ppm 140 برای گاز NO2 در حالت ترکیب دو گاز به دست آمد.

کلیدواژه‌ها

20.1001.1.26455153.1404.13.1.5.0

عنوان مقاله [English]

Simultaneous detection of NO2 and SO2 gases using differential optical absorption spectroscopy

نویسنده [English]

abolhasan mobashery

Assistant Professor, Malek Ashtar University of Technology, Tehran, Iran

چکیده [English]

Differential optical absorption spectroscopy (DOAS) is a technique used to determine the concentration of gaseous pollutants in the environment. This method is used to measure the concentration of pollutants in a vertical column of the atmosphere over long distances. Typically, the absorption spectra of various gases present in the atmosphere overlap in the ultraviolet-visible spectral region. Specifically, the absorption spectra of SO₂ and NO₂ gases overlap in the 290~310 nm wavelength range. As such, the presence of NO₂ can lead to errors in determination of the concentration of SO₂. This paper has thus developed an algorithm to simultaneously determine the concentrations of both SO₂ and NO₂ using the differential absorption method. To test the proposed algorithm, an empirical lab setup was established, and spectroscopic measurement trials were conducted. In this algorithm, the gas absorption spectrum is divided into two components: One fast-changing part and another slow-varying component. The fast-changing component of the absorption spectrum is used for gas detection, while the slow-changing component is used to determine the gas concentration. The experimental setup includes a deuterium-halogen light source, a 25 cm single-pass cell, and a spectrometer. To detect the concentration values for the two gases, various known concentrations of NO₂ and then SO₂ were introduced into the gas cell, and calibration curves were plotted for each gas separately. Subsequently, different concentrations of the SO₂/NO₂ gas mixture were introduced into the gas cell, and a calibration curve was recorded for the gas mixture. Using these curves and the proposed algorithm, the concentrations of the two gases were determined with a %2 accuracy. When both gases were present in the mixture, the detection limits were found to be 72.8 ppm for SO₂ and 140 ppm for NO₂.

کلیدواژه‌ها [English]

Differential Optical Absorption Spectroscopy
gas detection
Sulphur dioxide
Nitrogen dioxide
Limit of detection
gas cel

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