In the context of seeking to develop laser system for remote sensing of main pollutants
atmosphere, we have designed and built a laser detection system provide non-intrusive in-situ
measurements of gas properties. relying on tunable diode laser abs
orption spectroscopy TDLAS
technology to detect ammonia gas and ethylene gas with high accuracy and a sufficient
sensitivity for economic and medical applications.
In this research work, the performance of the measurement system (TDLAS) has been improved, it was connected to the computer for acquisition and processing data using the programming language MatLab. The internal surface of the cavity was coated by p
araffin wax, adsorption is significantly lowered.
This system has been employed to measure the concentration of ammonia in exhaled breath for 20 healthy volunteers in two cases (fasting and non-fasting), and 36 volunteers with chronic renal disease (before hemodialysis).
