Nova PM Sensor SDS011 can measure fine dust and smoke = particulate matter (PM) concentrations in two categories:
- Ultrafine dust particles with a diameter of 0 – 2.5 micrometres (μm/m3). Output PM2.5
- Fine dust particles with a diameter 2.5 – 10 micrometres (μm/m3). Output PM10
The sensor is designed with a built-in fan to ensure sample air circulation to a chamber with a laser diode, where the size and amount of PM is determined. The scattered light is transformed into electrical signals and with further analysis, on the signal waveform, the digital output of the component is the particle concentration of PM2.5 andPM10 (from counts of particles with diameters from 0.3 to 10μm). The working principle is based on light scattering, where a light source illuminates the particles and the scattered light is transformed into a signal by a photodetector, the amplitude of which depends on the light wavelength, scattering angle, particle size and relative index of refraction between medium and particle.
Datasheet: SDS011 laser PM2.5 sensor specification-V1.4