Deteksi dan Pengukuran Spektra dalam Analisis Spektrografi Emisi dengan Pengolahan Citra

Itmy Hidayat Kurniawan, Sahat Simbolon

Abstract


Abstract—Qualitative and quantitative analysis on emission spectrograph detector are important to identify impurities elements in nuclear fuel. the process is still using a densitometer based manual method which has limitations due mechanical factors on instrument and expert chemists requirements. To reduce measurement error on manual methods, we develops analytical methods by processing scanned digital image of a spectrogram. The aim of this paper is to identify impurities on nuclear fuel elements (boron and cadmium in uranium oxide). Image processing is done by cropping digital image to separate each the spectra result of excitation processes and identify impurities, which enlarged later to refine the distribution of signal intensity of pixels. Signal processing methods for quantitative analysis conducted with pulse peaks analysis. Results obtained then substituted into a standard curve obtained from regression analysis of sample reference to calculate concentration of the element. End results indicated that signal processing can be used to identify and analyze the elements in the detector, element concentrations value of image processing is not different from the results of analysis of densitometer on statistic significancy level of 5%.

Keywords— Image Processing, Spectrograph Analysis, Scanned Spectral Image, Peak Detection

Intisari— Analisis kualitatif dan kuantitatif pada detektor spektrografi emisi dilakukan untuk uji takmurnian dalam bahan bakar nuklir. Saat ini perangkat yang digunakan untuk analisis spektra pada detektor dilakukan dengan pengukuran manual berbasis densitometer. Penelitian ini difokuskan pada penerapan metode untuk menganalisis unsur boron dan kadmium dalam uranium oksida menggunakan pengolahan citra digital. Metode ini diawali dengan akuisisi citra detektor spektrografi emisi ke dalam komputer menggunakan image scanner, selanjutnya piksel citra yang diidentifikasi sebagai unsur boron dan kadmium didistribusikan nilai intensitas pikselnya dalam bentuk kurva. Analisis kualitatif dilakukan dengan menentukan keberadaan kurva pada area yang diprediksi sebanding dengan spektra garis unsur yang dianalisis. Analisis kuantitatif dilakukan dengan mengukur ketinggian puncak kurva. Hasil pengukuran ketinggian kurva diamati untuk masing-masing unsur dan dibuat kurva kalibrasi. Masing-masing kurva standar dilakukan uji signifikansi dan linieritasnya, sedangkan hasilnya menunjukkan bahwa semua kurva standar dapat digunakan untuk menghitung konsentrasi sampel uji. Hasil analisis dan pengujian menunjukkan bahwa metode pengolahan citra dapat dipergunakan untuk mengidentifikasi dan menganalisis unsur. Nilai konsentrasi unsur dari analisis pengolahan citra tidak berbeda dengan hasil analisis dari densitometer pada taraf signifikansi secara statistik sebesar 5%.

Kata Kunci— Pengolahan Citra, Analisis Spektrografi Emisi, Deteksi Puncak


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References


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DOI: http://dx.doi.org/10.22146/jnteti.v3i1.44

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