In wireless data collection, transmission, and monitoring for industrial and agricultural environments, gas sensors are widely used, among which CO2 sensors are the most common in the market. Below, we will briefly introduce several common types of CO2 sensors.

1. Electrochemical CO2 Sensors:

Electrochemical sensors detect CO2 concentration through electrochemical reactions, typically using sodium hydroxide or potassium carbonate solutions as electrolytes. These sensors have high selectivity for CO2 but may be affected by interference from other gases.

2. Infrared CO2 Sensors:

Infrared sensors utilize the absorption characteristics of CO2 gas at specific infrared wavelengths to detect concentration. These sensors offer high detection accuracy and are not affected by other gases.

3. Laser Gas Sensors:

Laser gas sensors use laser light sources to detect gas concentration by analyzing the absorption or scattering properties of the laser in the gas. These sensors feature high sensitivity and selectivity but come at a higher cost.

4. Cavity Ring-Down Sensors:

Cavity ring-down sensors detect gas concentration by utilizing the absorption and scattering of gas molecules within a resonant cavity. These sensors offer exceptional sensitivity and selectivity.

5. Waveguide Gas Sensors:

Waveguide gas sensors utilize the propagation characteristics of light waves in a waveguide to detect gas concentration. These sensors enable fast, non-invasive gas detection.

6. Micro-Electro-Mechanical Systems (MEMS) Sensors:

MEMS sensors are manufactured using micro-machining technology, enabling miniaturized, low-power gas detection. These sensors are commonly used in portable and wearable devices.