Our Herriott cell has a base length of 18.5 cm with 100 passes to achieve a nominal light absorption length of 18.5 meters. As shown in the above figure, measurement precision is around 0.07 - 0.1 ppm (1s) for an integration time of 30 seconds, sufficient to capture any short- or long-term  significant CH₄ concentration changes in the ambient air due to local emissions or regional transports.

Time series of CH₄ measured in the ambient air

Scalability

• Capable of simultaneously conducting 24-hour uninterrupted, high temporal resolution, accurate measurements of greenhouse gas CH₄ and various environmental parameter indicators (CO₂, wind speed, wind direction, temperature, humidity, atmospheric pressure, light exposure, rainfall, radiation, noise, PM₁, PM_2.5, PM₁₀, SO₂, NO₂, NO, O₃, CO, and TVOC, etc.)

Technological Advancement

• Data temporal resolution adjustable from 20 seconds to 1 hour;

• Accurately measures outdoor CH₄ concentrations (e.g., 2 - 20 ppm) and maintains a high baseline stability over the long term;

• The device achieves remote upgrades through automatic firmware updates and parameter changes, reducing operational workload;

• In the absence of network signals, the device can back up data for at least over a year, and the backed-up data can be continued to be transmitted to the server after the wireless signal is restored.

Comprehensive Ecological Environment Big Data Management Platform for Intelligent Data Application and Analysis

• 4G wireless transmission to the data platform, with display and application capabilities on various smart devices.