The optical part of the dust meter includes laser light source, power control, photoelectric sensing, and scattered light receiving part. The principle of laser dust detection is that the beam emitted by the laser enters the emission source at a slight angle. The laser beam interacts with the smoke particles to produce scattered light. The backscattered light enters the sensor through the receiving system and is converted into an electrical signal for processing.

Advantages of laser dust detection:

  1. Using the principle of laser scattering, there will be no uneven refractive index caused by mechanical vibration of the flue and uneven flue gas temperature, resulting in beam swing.
  2. Easy to install, single-ended installation, no need for optical paths to pass through.
  3. After the laser beam is modulated, the anti-interference ability of the system is greatly improved.
  4. High electro-optical conversion efficiency, low power consumption, energy saving and environmental protection.
  5. Long life and can work continuously.

It should be noted that when laser detects dust, the light source must have strong enough output light power so that the scattered light generated will be strong enough. In addition, the light source line should be thin and the divergence angle should be small to reduce the impact of dispersion on the signal captured by the light sensor.