Measurement of Time-Averaged Temperature and Concentration of Exhaust Gas using Absorption Spectroscopy

Measuring the total emissions of exhaust gases resulting from fuel utilization is considered crucial. Traditionally, evaluating the combustion process involves assessing exhaust gas temperature and concentration. However, conventional measurement techniques utilizing thermocouples face limitations in accurately gauging irregular and rapidly fluctuating temperature readings, primarily due to localized sample contact. In this study, the real-time fluctuations in the time-averaged temperature and exhaust gas concentration were evaluated. The primary objective is to measure the temperature and concentration of the target gas using TDLAS (Tunable Diode Laser Absorption Spectroscopy), an optical measurement method. Furthermore, by employing a multi-laser configuration, real-time variations in temperature and concentration within the exhaust gas can be easily examined in a two-dimensional format.