Kyushu Space explains how dust meter works
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The dust meter produced by our company operates based on the principle of light scattering. When air containing dust particles is drawn into the device through the sampling port, it first passes through a particle size cutter. This component ensures that only particles smaller than a specific size are allowed to enter the detection chamber, while larger particles are filtered out. The remaining fine dust then enters a dark chamber where a light source illuminates the particles.
As the dust particles are illuminated, they scatter the light in all directions. The intensity of this scattered light is directly proportional to the mass concentration of the dust present in the air. The sensor inside the device detects this scattered light and converts its intensity into an electrical signal, which is then processed as a pulse count. This count represents the relative dust concentration, typically measured in counts per minute (CPM).
The microprocessor within the instrument uses a pre-set conversion coefficient to transform the relative concentration into an actual mass concentration value, expressed in milligrams per cubic meter (mg/m³). This enables the device to provide accurate and real-time measurements of airborne particulate matter, making it suitable for a wide range of environmental monitoring applications. The design ensures high sensitivity and reliability, allowing users to effectively assess air quality in various settings.