Measurements on CO Concentration and gas temperature at 1.58 um with Tunable Diode Laser Absorption Spectroscopy

2007 ◽  
Author(s):  
Fei Wang ◽  
Ning Li ◽  
Qunxing Huang ◽  
Jianhua Yan ◽  
Kefa Cen
Keyword(s):  
Diode Laser ◽  
Absorption Spectroscopy ◽  
Tunable Diode Laser ◽  
Gas Temperature ◽  
Laser Absorption Spectroscopy ◽  
Laser Absorption ◽  
Co Concentration ◽  
Diode Laser Absorption

CO Concentration Measurement in the High Temperature Flame With Tunable Diode Laser Absorption Spectroscopy

2011 ◽  
Author(s):  
Ting Xu ◽  
Fei Wang ◽  
Zhishen Jiang ◽  
Jianhua Yan ◽  
Kefa Cen ◽  
...  
Keyword(s):  
High Temperature ◽  
Diode Laser ◽  
Absorption Spectroscopy ◽  
Equivalence Ratio ◽  
Tunable Diode Laser ◽  
Laser Absorption Spectroscopy ◽  
Laser Absorption ◽  
Co Concentration ◽  
Diode Laser Absorption ◽  
Combustion Environment

CO concentration real-time monitoring in combustion process has great significance in improving combustion efficiency and controlling combustion emissions. No CO-spectroscopy solid state sensors are available at the high temperature of 1600K–2000K in the flames. Gas sensing based on tunable diode laser absorption spectroscopy (TDLAS) with the advantages of high sensitivity, high selectivity, quick response and non-intrusiveness offers the possibility for on-line measurement in combustion environment. CO absorption line located at 2302.12nm is selected for measurement by direct absorption method in premixed C3H8/Air flat flame. Experiment results show that, when equivalence ratio is larger than one, the concentration of CO in the flame is increased with the increase of equivalence ratio. It proves that this method can be used on combustion environment.

A Measurement Based on Tunable Diode Laser Absorption Spectroscopy for Pressure in Gas Flow

2014 ◽  
Vol 1051 ◽  
pp. 910-914
Author(s):  
Song Ji Peng ◽  
Yan Ji Hong ◽  
Guang Yu Wang ◽  
Hu Pan
Keyword(s):  
Diode Laser ◽  
Absorption Spectroscopy ◽  
Gas Flow ◽  
Gas Pressure ◽  
Tunable Diode Laser ◽  
Measuring System ◽  
Gas Temperature ◽  
Laser Absorption Spectroscopy ◽  
Laser Absorption ◽  
Diode Laser Absorption

Pressure is a very important parameter for combustion diagnostics since pressure is a good indicator of combustion efficiency .As combustion technologies mature, more accurate and less response time pressure diagnosis are needed. Line of sight (LOS) tunable diode laser absorption spectroscopy (TDLAS) provides a fast, nonintrusive, sensitive and reliable solution for quantitative sensing of multiple flow field parameters including gas temperature, components concentration, and mass flux. So far, there is no mature method to measure gas pressure using TDLAS, and it is very important to perfect TDLAS measuring system with the gain of pressure.This paper intends to found a method based on TDLAS for gas pressure measurement. At first, a gas pressure measuring method is presented. Then, an experiment is conducted in a heated static cell to verify this method. A Direct-Absorption-Based Senor which scans H2O transitions near 1.4 μm was used, and this made the measuring system compact, low cost, simple to operate and quick to response. The experiment successfully measured the pressure in several pressure points, and the results agreed well with the data measured by pressure sensor, average difference is 3.1%.

scholarly journals Detection Limit of CO Concentration Measurement in LPG/Air Flame Flue Gas Using Tunable Diode Laser Absorption Spectroscopy

Energies ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 4234
Author(s):  
Sunghyun So ◽  
Jiyeon Park ◽  
Aran Song ◽  
Jungho Hwang ◽  
Miyeon Yoo ◽  
...  
Keyword(s):  
Detection Limit ◽  
Diode Laser ◽  
Absorption Spectroscopy ◽  
Equivalence Ratio ◽  
Tunable Diode Laser ◽  
Laser Absorption Spectroscopy ◽  
Laser Absorption ◽  
Co Concentration ◽  
Diode Laser Absorption ◽  
Combustion Environment

In a combustion reaction of hydrocarbon fuel, carbon monoxide (CO) is a gas species that is closely related to air pollution generation and combustion efficiency. It has a trade-off with nitrogen oxide and increases rapidly in case of incomplete combustion or in fuel-rich (Φ > 1) environments. Therefore, it is essential to measure CO concentration in order to optimize the combustion condition. In the case of a steel annealing system, the combustion environment is maintained in a deoxidation atmosphere to prevent the formation of an oxide layer on the steel sheet surface. However, it is difficult to measure the CO concentration in a combustion furnace in real-time because of the harsh environment in the furnace. Tunable diode laser absorption spectroscopy, which has the advantages of non-invasiveness, fast response, and in situ measurement-based optical measurement, is highly attractive for measuring the concentration of a certain gas species in a combustion environment. In this study, a combustion system of a partially premixed flamed burner was designed to control the equivalence ratio for fuel-rich conditions. CO concentration was measured using a distributed feedback laser with a wavenumber of 4300.7 cm−1 in the mid-infrared region. The results showed that the CO concentration measured at an equivalence ratio of 1.15 to 1.50 was 0.495% to 6.139%. The detection limit in the combustion environment was analyzed at a path length of 190 cm and an internal temperature of 733 K. The ranges of the peak absorbance were derived as 0.064 and 0.787, which were within the theoretical bounds of 10−3 and 0.80 when the equivalence ratio was varied from 1.15 to 1.50.

Sign in / Sign up

Export Citation Format

Share Document