Low-cost ndir-based GHG flux measurement system for soil respiration and atmospheric gradients
A proof-of-concept prototype using affordable non-dispersive infrared (NDIR) sensor technology to measure greenhouse gas (CO2 and N2O) fluxes in agroecosystems. The system replaces expensive infrared gas analyzers with low-cost single-beam and dual-wavelength sensors, enabling soil respiration chamber measurements and atmospheric flux-gradient sampling at a fraction of current costs.
Overview
This project delivers a proof-of-concept measurement system that uses affordable non-dispersive infrared (NDIR) sensor technology to accurately measure greenhouse gas fluxes in agroecosystems. Traditional micrometeorological and chamber-based gas flux measurements rely on expensive infrared gas analyzers. By leveraging recent advances in low-cost NDIR single-beam and dual-wavelength sensors, this system can measure CO2 accumulation in survey chamber headspace and atmospheric CO2 gradients at a total construction cost of less than $5000, compared to $700 to $3000 per probe in conventional setups.
The technology addresses a key challenge in agricultural and environmental monitoring: the high cost of deploying sufficient spatial coverage for reliable greenhouse gas flux measurements. By optimizing sampling frequency to compensate for slower sensor response times, the system achieves accurate CO2 measurements suitable for both soil respiration chamber studies and large-area atmospheric flux-gradient sampling across five or more acres.
Technical specifications
Core technology:
- Low-cost NDIR single-beam and dual-wavelength CO2 sensors (e.g., Vaisala-style probes)
- Adjustable sampling frequency to compensate for slower sensor response times
- Closed-loop survey chamber design for soil respiration measurements
- Atmospheric CO2 sampling system configured for flux-gradient measurements
System capabilities:
- CO2 accumulation measurement in chamber headspace
- Atmospheric CO2 gradient measurement across areas of five or more acres
- Planned integration of low-cost N2O sensor for expanded GHG coverage
- Construction cost under $5000 for both prototypes combined
Validation approach:
- Field testing of both the closed-loop chamber and atmospheric sampling prototypes
- Cross-validation against industry-standard commercially available infrared gas analyzers already available in the research lab
Technology readiness level
This project is at the proof-of-concept stage. The research team at North Carolina State University will design, build, and field-test two prototypes: a CO2 closed-loop survey chamber for soil respiration and an atmospheric CO2 sampling system for flux-gradient measurements. Following successful proof-of-concept validation, a low-cost N2O sensor will be integrated into the measurement systems. Both prototypes will be validated against industry-standard instruments under field conditions before advancing toward broader deployment.
About North Carolina State University
North Carolina State University is a large, comprehensive public land‑grant research university in Raleigh. Its on‑campus research and technology park co‑locates corporate R&D groups, government partners, and faculty labs, enabling shared facilities, prototyping, and agile contracting. Located in North Carolina’s Research Triangle, partners tap a dense regional ecosystem while engaging through a statewide extension network and a mature co‑op program that deliver field deployment and workforce pipelines. Multiple pilot and demonstration facilities support scale‑up and validation toward pre‑commercial readiness. Research is supported by competitive funding from major federal agencies, including NSF, USDA, DOE, and DOD, and a dedicated technology transfer office with clear IP pathways helps accelerate commercialization.
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