KARAKTERISASI SPEKTROMETER FOTOAKUSTIK LASER CO2 KONFIGURASI INTRKAVITAS DAN APLIKASINYA DALAM PENGUKURAN KONSENTRASI GAS ASETON (C3H6O) PADA GAS HEMBUS ORANG YANG BERJALAN DI ATAS TREADMILL; CHARACTERIZATION OF CO2 LASER PHOTOACOUSTIC SPECTROMETER INTRACAVITY CONFIGURATION AND ITS APPLICATION IN MEASURING ACETONE (C3H6O) GAS CONCENTRATION OF HUMAN EXHALED BREATH DURING EXERCISE ON TREADMILL

MUYASAROH, NURUL, Mitrayana

2016 | Disertasi | FMIPA

Photoacoustic spectrometer is very effective instrument for detecting low concentration gases. In this research, a CO2 laser photoacoustic spectrometer intracavity configuration had been characterized and applied for measuring acetone gas concentration of human exhaled breath during exercise on treadmill. The characterization include laser power optimation, scanning laser spectrum, making resonant curve and quality factor, measuring noise and background signal, determining lowest detection and linearity curve. Acetone gas concentration was determined by analyzing normalized photoacoustic signal using multicomponent matrix. The optimum power was obtained at (32,4 + 0,5) W and CO2 laser spectrum consisted of four line groups. The highest laser absorption line of standard acetone gas was determined at 10P20. Quality factor was obtained at 14,6 ± 0,6, noise was (1,7 + 0,2) ?V/Hz1/2, background signal at 10P20 was 0,001-0,004 mV, lowest detection limit of acetone gas was (110 + 14) ppbV and acetone gas linierity gradient on 10P20 was

Kata Kunci : Intracavity configuration CO2 laser photoacoustic spectrometer, acetone gas concentration, exercise, treadmill