A TDLAS Sensor for Simultaneous Measurement of Temperature and C2H4 Concentration Using a Differential Absorption Scheme at High Temperature

Abstract

Ethylene (C 2 H 4 ) concentration and temperature is simultaneously measured in high temperature environments using a differential absorption scheme combined with a distributed feedback (DFB) diode laser near 1. 620 µm. Based on optimal selection criteria, two wavelength pairs with absorption peaks at 6,174.58 cm −1 and 6,174.98 cm −1 are selected for the measurement. Temperatures are obtained from the ratio of the absorption cross-section of the two wavelength pairs, and C 2 H 4 concentration is inferred from the differential absorption of one of the wavelength pairs. Measurements are performed in a high temperature cell (T = 300-900 K, P = 1 atm) to verify the accuracy of the system. The accuracies for the measurement of C 2 H 4 concentration and temperature are 1.135 and 2.215%, respectively. Continuous time series measurements indicated that the system has a good stability, and the limit of detection achieved by Allan-Werle variance analysis is 6.6 ppm at the optimal average time of 340 s. All the measurements show the scheme is helpful for improving the practicality of laser absorption spectroscopy in combustion diagnosis.

Temperature measurement of SO2 based on mid‐infrared laser absorption spectroscopy

“…Cai et al demonstrated accurate and fast measurement of carbon dioxide concentration and temperature based on TDLAS 5 . Zhang et al presented the measurement of C 2 H 4 concentration and temperature using TDLAS in the combination of differential absorption scheme 6 …”

Simultaneous Detection of CO₂ and N₂O Based on Quartz-enhanced Photothermal Spectroscopy by Using NIR and MIR Lasers

“…Non-optical sensor such as electrochemical and semiconductor sensors is based on chemical processes and electrical properties to detect gases with an advantage of low-cost [12,13]. Optical sensor is mainly based on light-matter interaction including absorption, scattering, and extinction [14,15], and is widely used in numerous fields of biomedical analyses [16,17], environmental monitoring [18,19], and combustion diagnosis [20][21][22] with advantages of fast response, high sensitivity and selectivity, real-time detection, etc. [23][24][25][26].…”

Highly Sensitive Trace Gas Detection Based on In-Plane Single-Quartz-Enhanced Dual Spectroscopy

“…Trace gas detection has numerous significant applications in various fields, such as biomedical analyses [1,2], combustion diagnosis [3][4][5], atmospheric environmental monitoring [6][7][8][9], as well as petroleum exploration [10,11]. Gas sensing technology based on laser absorption spectroscopy (LAS) has a number of advantages, including high sensitivity, rapid response time, high selectivity, et al [12].…”