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Oasis-Knowledge
Sensors
SPS-30: Particulate Matter Air Quality
Introduction
The SPS30 is a PM 2.5 sensor, where PM 2.5 stands for Particulate Matter that has a particle diameter up to 2.5 micrometers. These very small particles are airborne pollutants that can exist anywhere in the atmosphere, such as the outside environment and indoors. These particles are harmful, as they are small enough to penetrate deep into the lungs and even enter the bloodstream, causing health problems like respiratory and cardiovascular diseases, and some types of cancer. They can be generated from vehicle emissions, industrial processes, wildfires, and chemical reactions in the atmosphere. Indoor sources of PM 2.5 particles include construction work, woodwork metalwork, and even cooking.
Sensor Working Principle
The SPS30 is an Optical Particle Counter (OPC), a device that uses light to detect. direct particles suspended in the ambient atmosphere. A measurement cell, which contains a light source (here, a laser) and a photodetector is opened to the atmosphere, drawing in particles. As the particles interact with the light, some of the light beam is scattered on to a photodetector. The signal from the photodetector is converted to particle count and mass concentration values in units of particles/cm3 and μg/m3. The main difference in performance between different sensors is the conversion method from the measured signal to mass concentration. This is because optical properties of particles like refractive index and shape strongly influence calculations of particle mass.
Sources
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