Vaisala CARBOCAP® Sensor for measuring carbon dioxide

Vaisala´s Carbocap Sensor technology
Published: Dec 14, 2017
Industrial Measurements
Innovations and Inspirations

The CARBOCAP® story began in 1992, when micromechanical sensors were being intensively researched at Vaisala. The groundbreaking idea of miniaturizing the Fabry-Perot Interferometer (FPI) was born, leading to collaborative development work with VTT Technical Research Center of Finland.

Later, a patent application was submitted for a single-channel gas concentration measurement method using the FPI. The driving force behind the innovation of the CARBOCAP® sensor was Vaisala's commitment to developing superior technologies for environmental measurements. And indeed, Vaisala’s pioneering work in the field of silicon-based NDIR technology and electrically tunable filters resulted in the compact, simple and high-performance CARBOCAP® sensor. To this day, the long-term stability and reliability of the measurement provided by the FPI is unrivaled.

The first commercial CARBOCAP® products for measuring ppm-level CO2 in ventilation applications were launched in 1997, with instruments for percentage-level CO2 measurements following soon after. CARBOCAP® technology is proven in a wide range of applications, including ecological measurements, where it performs reliably in harsh environments such as soil and snow, satisfying the thirst for knowledge that scientists have for understanding nature´s processes. see how the technology works! Or watch video about the CARBOCAP® Technology.

CARBOCAP’s unique benefits
Superior stability enabled by built-in reference measurement
Minimal maintenance and calibration requirements
Insensitive to dust, water vapor, and most chemicals
Insensitive to changing air flow rates









How does the Vaisala Carbocap Technology work? Carbon dioxide has a characteristic absorbance band in the infrared (IR) region at a wavelength of 4.26 μm. This means that when IR radiation is passed through a gas containing CO2 , part of the radiation is absorbed. Therefore, the amount of radiation passing through the gas depends on the amount of CO2 present, and this can be detected with an IR detector.