A PM sensor (Particulate Matter sensor) is a device that detects and measures the concentration of microscopic solid or liquid particles suspended in the air. Here's a breakdown of its key aspects:
Function & Purpose
It specifically targets particulate pollutants like PM2.5 (particles ≤ 2.5 micrometers) and PM10 (particles ≤ 10 micrometers), which are major air contaminants posing health risks. PM sensors monitor air quality in real-time and can trigger alerts when pollution levels exceed safety thresholds.
Working Principle
Most PM sensors operate using optical methods:
Light Scattering: A light source (laser or infrared LED) illuminates particles as air is drawn through the sensor. Scattered light is detected by a photodiode, with the intensity correlating to particle concentration.
Detection Types: Laser-based sensors offer higher precision for smaller particles (≥0.1μm) but are costlier. Infrared sensors are simpler and cheaper but less precise (detect ≥0.3μm particles).
Applications
PM sensors are integral to:
Air quality monitors and portable pollution trackers.
Air purifiers and smart ventilation systems for automatic operation.
Environmental research and urban pollution mapping.
Occupational health monitoring in industrial settings.
Integration & Data Transmission
Sensor data is often transmitted wirelessly via devices like DTUs (Data Transmission Units) to cloud platforms for remote monitoring, analysis, and system control.
In essence, PM sensors are critical tools for quantifying harmful airborne particles, enabling informed actions to mitigate pollution exposure.
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