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Identifier

000448257

Title

Development and application of near-infrared spectroscopy for the detection of atmospheric pollutants and volatile compounds of agri-food products

Alternative Title

Ανάπτυξη και εφαρμογή φασματοσκοπίας laser εγγύς υπερυθρου για την ανίχνευση ρύπων στην ατμόσφαιρα και πτητικών ενώσεων σε προϊόντα αγροδιατροφής

Author

Σταυρακάκης, Γεώργιος

Thesis advisor

Παπάζογλου, Δημήτρης
Βελεγράκης, Μιχάλης
Σαμαρτζής, Πέτρος

Abstract

Detection of toxic, explosive, hazardous gases and greenhouse gases (GHG) is of great importance. Several gas-sensing devices and sensors are currently available based on various methods however, there is a strong demand for improved sensitivity, reliability and simplicity. Laser-based infrared spectroscopy is a novel method increasingly applied for gas detection, thanks to its high selectivity, responsivity and sensitivity. In the current work, two types of laser-based near-infrared spectroscopy techniques were employed for gas detection; Tunable Diode Laser Absorption Spectroscopy (TDLAS) and Tunable Diode Laser Photoacoustic Spectroscopy (TDLPAS). An experimental apparatus was developed for measurements of both spectroscopic techniques. The absorption spectra of five gases, carbon dioxide (CO2), methane (CH4), ammonia (NH3), nitrous oxide (N2O) and acetylene (C2H2) were recorded. A processing method of the acquired spectra was implemented and the limits of detection, in the present case, for each gas were estimated. Finally, a comparison of the two techniques was performed and a further discussion about their efficiency, usability and improvement of them is presented.

Language

English

Subject

Diode laser

Gas detection

Photoacoustic spectroscopy

Ανίχνευση αερίων

Διοδικό λέιζερ

Φωτοακουστική φασματοσκοπία

Issue date

2022-03-18

Collection