20.500.12556/DKUM-95591 Absorpcijska spektroskopija z nastavljivo lasersko diodo in integriranim lock-in ojačevalnikom magistrsko delo Absorption spectroscopy with a tunable laser diode and integrated lock-in amplifier Magistrsko delo obravnava metodo absorpcijske spektroskopije z nastavljivo lasersko diodo. Predstavljeno je teoretično ozadje metode in način kako tokovno modulirati DFB laser, ki omogoča natančno spreminjanje valovne dolžine izsevane svetlobe. Nadalje je predstavljeno zasnovano elektronsko vezje na osnovi analognega lock-in ojačevalnika in programska oprema za zajem in obdelavo signalov. Opisana je metoda demodulacije višjih harmonikov, s katero se poveča občutljivost meritev in zmanjša vpliv šumov. Prav tako so prikazane eksperimentalne meritve, ki potrjujejo prisotnost višjih harmonikov v merjenem signalu. Meritve so bile izvedene za amonijak, ki je bil pridobljen iz amonijevega hidroksida. The master's thesis addresses the method of absorption spectroscopy using a tunable diode laser. It presents the theoretical background of the method and the way in which the DFB laser is current modulated, allowing precise control of the emitted light wavelength. Furthermore, the designed electronic circuit and software for signal acquisition and processing are presented. The method of higher harmonic demodulation is described, which increases measurement sensitivity and reduces the influence of noise. Experimental measurements are also shown, confirming the presence of higher harmonics in the measured signal. The measurements were performed on ammonia, which was obtained from ammonium hydroxide. absorpcijska spektroskopija 2f-TDLAS višji harmoniki lock-in ojačevalnik DFB laser absorption spectroscopy 2f-TDLAS higher harmonics lock-in amplifier DFB laser true true false [B. Papotnik] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2025-09-29 21:05:38 2025-10-23 10:24:16 2025-12-16 03:08:53 0000-00-00 00:00:00 2025 0 Maribor 0 Maribor 1 spletni vir (1 datoteka PDF (XI, 57 str.)) 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 (621.38:543.421043.2) 261336323 MAG_Papotnik_Blaz_2025.pdf MAG_Papotnik_Blaz_2025.pdf 1 F9F926BD96A076013B337656D4B1F346 88e5f53ab7b2bb2b2b8803d882a19f7b3ff361a7b0fab31b9bdff5f54a0c6a7f e5b23fce-9d68-11f0-8bbe-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=199367 Fakulteta za elektrotehniko, računalništvo in informatiko 0 0 0