Dissolved CO2 is typically measured using an optical sensor that leverages non-dispersive infrared (NDIR) absorption.
Understanding NDIR Technology for CO2 Measurement
The core of the measurement process lies in the use of NDIR technology. Here's a breakdown:
- An optical sensor is placed inside the sample.
- The sensor emits infrared radiation.
- CO₂ molecules present in the measurement chamber absorb some of this radiation.
- The amount of radiation absorbed is directly proportional to the amount of CO₂ present.
How NDIR Sensors Work in Practice
Here's a step-by-step look at how NDIR sensors function:
- Infrared Emission: The sensor contains an infrared light source.
- Sample Interaction: The emitted infrared radiation passes through the sample being measured (e.g., water sample).
- Absorption: CO₂ molecules in the sample absorb specific wavelengths of infrared light.
- Detection: A detector measures the remaining infrared light after absorption.
- Calculation: The difference between emitted and detected light is used to determine the concentration of dissolved CO₂.
This technology provides a non-destructive method for accurate CO₂ measurement.
Advantages of Using NDIR Sensors for Dissolved CO2
Using an NDIR sensor provides several benefits:
- Accuracy: Provides reliable and precise CO2 measurements.
- Non-Destructive: Doesn't consume the sample, making it suitable for various applications.
- Real-Time Monitoring: Can provide continuous readings for dynamic systems.
- Robust: Typically requires low maintenance and is long-lasting.
Practical Applications
This method is commonly used in various fields:
- Environmental Monitoring: Assessing water quality and CO2 levels in aquatic ecosystems.
- Industrial Processes: Monitoring fermentation processes and carbon capture.
- Research: Conducting precise experiments and analysis involving dissolved CO2.
