OPTIMASI DAYA LASER PADA SPEKTROMETER FOTOAKUSTIK LASER CO2 KONFIGURASI INTRAKAVITAS DAN APLIKASINYA DALAM PENGUKURAN KONSENTRASI GAS ETILEN PADA GAS HEMBUS RELAWAN PEMAKAN GORENGAN; LASER POWER OPTIMIZATION OF CO2 LASER PHOTOACOUSTIC SPECTROMETER INTRACAVITY CONFIGURATION AND ITS APPLICATION IN MEASURING ETHYLENE GAS CONCENTRATION OF FRIED FOODS CONSUMER’S BREATH

Tuqo, Mamila Ziyyit, Mitrayana

2015 | Disertasi | FMIPA

The laser power optimization of CO2 laser photoacoustic spectrometer intracavity configuration has been conducted. It was generated 4 laser group and highest power was obtained at 37 W with medium active gas composition He:N2:CO2 was 30:70:55. The highest laser absorption line of standard ethylene gas was acquired at 10P14 and lowest detection limit was obtained at 57,1+0,4 ppb (part per billion). Furthermore, CO2 laser photoacoustic spectroscopy applied to the measuring of ethylene gas (C2H4) in fried foods consumer breath. Samples were variated for ages and genders. Based on research, for <15 years volunteers, the highest concentration of ethylene gas was 5,570±0,002 ppm during 30 minutes after eating fried foods. For volunteers aged 15-30 years, the highest concentration of ethylene gas was 5,644±0,002 ppm during 120 minutes after eating fried foods. For volunteers aged> 30 years, the highest concentration of ethylene was 6,866±0,002 ppm during 120 minutes after eating fried foods. The result showed that eating fried food influenced the increase of ethylene concentration in body then there was difference of ethylene gas concentration to the age variation due to the difference metabolism in human body.

Kata Kunci : CO2 laser photoacoustic spectrometer; fried food consumer; ethylene gas.