南频-应用笔记-MDSM025B（MDSM Particle Sensor Application Note)

1. Structure and Principle of MDSM Particle Sensor
Lens
LED
ParticleInlet
Particle Vent
Heater
1) Structure
As above Block Diagram, MDSM501 consists of IR(infrared ray) LED, Photo TR(PT) which recognizes the IR as a signal, and condensation lens to maximize the reflected IR light by floating particles. Also, There is a heater to move up the in-flowed particles. In addition, for the smooth air flow, there are particle inlet at the bottom and particle vent at the top of the sensor.
2) Principle
When the in-flowed particles from outside passes by the measuring point with heated updraft, the light from infrared LED is scattered by floating particles, and Photo TR(PT) recognizes it. The light from Photo TR(PT) is transformed into PWM signal through amplification, filtering and MCU.


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