# Non-Dispersive Gas Analyzer for H2O and CO2 Flux Analysis by the Eddy Covariance Method

## TL;DR

This paper describes the development of a new gas analyzer for measuring water vapor and carbon dioxide using an innovative infrared radiation method.

## Contribution

The paper introduces a new discrete IR radiation generation scheme using pulse-width modulation for gas analysis.

## Key findings

- The NGAP-1 prototype was developed with a novel IR radiation generation method.
- The analyzer was calibrated and validated in field experiments as part of an ecological and climatic station.
- The device is intended for use in the eddy covariance method for flux analysis.

## Abstract

This article presents the stages of development of a non-dispersive infrared (NDIR) open-type gas analyzer prototype (NGAP-1) with a fundamentally new discrete IR radiation generation scheme using pulse-width modulation for measuring the dynamics of water vapor and carbon dioxide concentrations, with further application in the instrument base of an ecological and climatic station to implement the eddy covariance (EC) method. In addition, selecting the component base for NGAP-1, as well as its calibration and experimental field validation as part of an ecological and climatic station, are described.