Air Quality Monitor Technology
How Does Atlanta Healthcare Airvisual Node Work?
The Atlanta Healthare air quality monitor AirVisual Node uses high precision laser to count particles in the air, which is then processed with a unique algorithm to calibrate for external factors such as temperature, humidity and outliers.
HOW DOES THE PM2.5 SENSOR WORK?
The light scattering laser sensor for PM2.5 measurements throws a laser light beam onto particles, and this light is then irradiated in all directions from these particles (scattering). A light detector (or 'photometer detector') then measures all of this scattered light, and from this, the sensor can calculate the concentration of particles within the chamber. In this way, the sensor is able to detect near microscopic particles ranging from 0.3μm to 2.5μm. The sensor in the AirVisual Node also has a small fan to ensure a constant flow of air through the measuring chamber. Each reading reported from the sensor is calibrated by a special algorithm which takes into account external temperature and humidity values.
HOW ARE THE CO2 LEVELS DETERMINED?
The CO2 readings are projected with the help of a CO2 sensor, which is an infrared gas sensor (NRID), the components of which include an infrared source, light tube, interference filter and infrared detector.