Now in mass production! Infineon's carbon dioxide sensor based on photoacoustic spectroscopy (PAS) technology gives objects the sense of smell

eric_wang

Now in mass production! Infineon's carbon dioxide sensor based on photoacoustic spectroscopy (PAS) technology gives objects the sense of smell [Copy link]

Affected by the COVID-19 pandemic, people have higher and higher requirements for air quality, which has driven the market demand for carbon dioxide concentration monitoring sensors. Studies have shown that there is a correlation between carbon dioxide concentration and aerosols, which is one of the transmission routes of viruses (such as COVID-19 or influenza). If we can reliably detect the carbon dioxide concentration in indoor spaces, we can actively control the risk of virus transmission. Therefore, accurate and affordable sensors based on Infineon's XENSIV PAS CO2 sensor are widely used in the field of air quality monitoring.Carbon dioxide concentrationMonitoring solutions are more important than ever. >>Now in mass production

Infineon's XENSIV PAS CO2 sensor is based on innovative PAS (photoacoustic spectroscopy) technology and has a very small footprint. Its size is less than a quarter of that of traditional CO2 NDIR sensors, and it is one of the few sensors of the same size that meets California Title 24 standards. This CO2 sensor can also accurately monitor indoor CO2 concentrations and use ventilation systems on demand based on precise sensor data to accurately control ventilation time in classrooms, offices, restaurants and residences, thereby saving energy and reducing the operating costs of ventilation systems. >>Now in mass production

The microcontroller integrated in the XENSIV PAS CO2 sensor can convert the detected CO2 concentration value into ppm, directly reading the actual CO2 concentration.

How does the XENSIV PAS CO2 sensor detect indoor air quality?

Light pulses from an infrared light source pass through a filter tuned to the wavelength that CO2 absorbs (λ = 4.2 m). CO2 molecules in the detection chamber absorb the filtered light, causing the molecules to vibrate and generate pressure waves with each pulse. This is called the photoacoustic effect. A highly sensitive MEMS acoustic detector detects the pressure changes produced by the CO2 molecules in the sensor cavity, and a microcontroller converts the output into a CO2 concentration reading. To obtain the most accurate ppm reading possible, the acoustic detector is optimized for low-frequency operation and the absorption chamber is acoustically isolated from external noise. >> Click here to learn more

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damiaa

Not bad, at first, it was a bit expensive, so I couldn't afford it for home use, but it's OK for industrial use. I guess the price will be better in the future.