Breakthrough CO2 sensor technology from Infineon
XENSIV™ PAS CO2 consists of a photoacoustic spectroscopy (PAS) transducer containing a detector, an infrared light source, and an optical filter, a microcontroller that performs signal processing and algorithms, and a MOSFET chip that drives the infrared light source on a printed circuit board. It is an integrated product. An integrated microcontroller performs advanced correction and setting algorithms along with ppm arithmetic.
The sensor uses a MEMS acoustic detector. By implementing the exceptional sensitivity of this acoustic detector in an integrated printed circuit board design, the required space is over 75% less than other true CO2 sensors on the market. As such, the XENSIV TM PAS CO2 sensor offers a size and cost advantage over modern NDIR sensors without compromising performance.
What is Photoacoustic Spectroscopy (PAS) Principle?
The PAS principle works as shown in the diagram above. A light pulse from an infrared light source passes through an optical filter tuned to the CO 2 absorption wavelength (λ=4.2µm). CO2 molecules in the measurement chamber absorb the filtered light and oscillate, producing pressure waves with each pulse. This is called the photoacoustic effect. A highly sensitive MEMS acoustic detector detects pressure changes caused by CO2 molecules within the sensor cavity, which the microcontroller converts to a CO2 concentration measurement and outputs. To obtain the highest possible accuracy of ppm measurements, the acoustic detector is optimized for low frequency operation and the absorption chamber is acoustically isolated from external noise.
Outstanding advantages of XENSIV™ PAS CO2
- Extremely small size (14X13.8X7.5 mm3) / Save space in your final product
- Accurate and robust performance at ppm level (±30ppm, ±3% of reading)
- Advanced correction and self-calibration algorithms
- Various configuration options (sampling rate, baseline calibration, etc.) and interfaces (UART, I2C, PWM)
- High quality data and compliance with smart building standards
- Plug-and-play for rapid design-to-market
Evaluation Board
XENSIV™ PAS CO2 Mini Evaluation Board
The XENSIV™ PAS CO2 Mini Evaluation Board enables rapid prototyping and design of CO2 sensing applications using Infineon's innovative Photo Acoustic Spectroscopy (PAS) carbon dioxide sensor. Using standard pin headers, it can be easily plugged into the target application board for flexible PCB design. The XENSIV™ PAS CO2 Mini evaluation board can be ordered in small quantities. Easier to use in the early stages of application development than standard reels.
Click here for details on the Infineon website
EVAL_PASCO2_SENSOR2GO Evaluation Kit
The XENSIV TM PAS CO2 Sensor2Go Evaluation Kit has been developed for quick and easy evaluation of Infineon's innovative CO2 sensor using photoacoustic spectroscopy (PAS).
The Sensor2Go Evaluation Kit can be used in conjunction with the PAS CO2 Mini Evaluation Board.
・Plug & Play: Direct connection to PC with micro USB cable
・All main functions of the sensor are available
・Record sensor history information
・All power supplies are generated onboard
・Device can be accessed via I2C
Click here for details on the Infineon website
Macnica CO2 concentration measurement automatic ventilation system demonstration video
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