Application Specific Semiconductor Lasers in sensor systems for chemical analysis

Abstract

Measurement methods based on laser spectroscopic techniques have always been a very attractive solution for chemical analysis of gaseous compounds due to well known properties like high selectivity, high sensitivity, and an inherent resistance to interference effects from other gases. Laser systems for real-time monitoring of gases have been used in a number of different applications. Emission control of diffuse leakages from petrochemical plants [1] and measurements of pollutants in urban areas [2] have successfully been performed. However, due to a high degree of complexity where well trained personnel is necessary these systems are ordinarily related with high costs and therefore its use are often limited to research establishments.