The Panasonic SN-GCJA5 Air Quality Sensor detects 'PM (particle matters) in the air' by optical method. This sensor employs LD (laser diode) as a light-emitting device and PD (photodiode) as a light-receiving device. The LD inside the sensor emits light to the air in a detection area. The PD inside the sensor detects scattering light which correlates to the actual floating particles in the air. An MCU inside the sensor analyses the wave profile from PD by optimistic algorithm, then output a converted mass-density (μg/m3) through I2C and UART interface.
The device is a small size offering high accuracy (±10%, from low to high concentrations). It provides high sensitivity and quick response. It maintains performance through a unique Auto-Calibration Function. It minimises dust accumulation by optimised air pathway structure that it makes possible to avoid 'tracking' for electrical safety.