Broadband spectroscopic sensor for real-time monitoring of industrial SO_2 emissions

Abstract

A spectroscopic system for continuous real-time monitoring of SO 2 concentrations in industrial emissions was developed. The sensor is well suited for field applications due to simple and compact instrumental design, and robust data evaluation based on ultraviolet broadband absorption without the use of any calibration cell. The sensor has a detection limit of 1 ppm, and was employed both for gas-flow simulations with and without suspended particles, and for in situ measurement of SO 2 concentrations in the flue gas emitted from an industrial coal-fired boiler. The price͞performance ratio of the instrument is expected to be superior to other comparable real-time monitoring systems.

Temperature-Corrected Oxygen Detection Based on Multi-Mode Diode Laser Correlation Spectroscopy

“…Coal combustion in industry constitutes a major pollution source, not least in China where coal is used as the major source of energy. Besides the analysis of combustion-generated pollutants such as SO 2 [8] and NO [9], quantitative detection of oxygen in the exhaust gas is necessary to provide normalizing reference. However, corrosion due to the presence of acidic gases in the coal-combustion exhaust prohibits the employment of certain oxygen sensors [10,11].…”

The use of lidar as optical remote sensors in the assessment of air quality near oil refineries and petrochemical sites

“…Correlation spectroscopy is often employed in the petrochemical and gas industry for leak detection and remedy against explosion, [6][7][8][9] differential absorption LIDAR enables three-dimensional mapping and total flux measurements, [10][11][12] while tunable diode laser absorption spectroscopy provides miniaturization and high sensitivity detection. 13 Generally, optical techniques have experienced tremendous development in the past decades, largely stimulated by the information technology and advances in laser technology.…”

Nanocomposite based on a liquid crystal doped with aluminum nitride nanotubes for optical sensor of sulfur dioxide

“…The optical signal is an information signal, and wavelength is a control parameter of our sensor. Carbon nanotubes, boron nitride, zinc oxide, titanium oxide, and iron oxide are widely used as absorbents of gasses . Theoretical aspects of sorption of gasses by various materials have been extensively studied by many researchers .…”