AN ARDUINO BASED LASER WAVELENGTH TUNING SYSTEM FOR TDLAS OF CARBON DIOXIDE

Abstract

Nowadays, accurate monitoring of greenhouse gas emissions, particularly CO2, is of crucial importance in both the environmental and healthcare sectors due to its significant impact on health and safety. In the environmental context, monitoring CO2 levels helps to assess the anthropogenic load on the atmosphere from transport and industries. In healthcare, capnography, a real-time CO2 monitoring method, plays a vital role in patient care by measuring end-tidal CO2 concentrations during anesthesia, resuscitation and intensive care.
Near Infrared absorption spectroscopy enables non-destructive and non-invasive monitoring with high sensitivity, selectivity and time resolution. From the point of view of absorption spectroscopy, the optimal choice for CO2 monitoring is the spectral range of 1567-1572 nm, the transitions in which are approximately 1000 times more intense than the transitions of other gases and isolated from the influence CO and H2O lines.
A commercially available IR diode laser module ML2540-1570 manufactured by LTT LLC (Minsk, Belarus) with a central generation frequency of 1570 nm and an output average radiation power of 4.5 mW was chosen as an IR radiation source. In the commercial version, the wavelength of this laser is tuning manually – by adjusting the analog potentiometer, which is not suitable for continuous measurements. As a solution to this problem, we developed a system for automatic wavelength tuning based on Arduino micro and a digital potentiometer. The use of this system allows tuning the generation wavelength in the range of 1568-1571.5 nm with an accuracy of less than 0.3 nm.

This research was funded by the Ministry of Science and Higher Education of the Russian Federation grant number 075-15-2024-557 dated 04/25/2024.

Speaker

Georgii K. Raspopin
Tomsk State University
Russia

Report

File with report

Discussion

Ask question