Laser dust sensor

The utility model provides a laser dust sensor, the laser instrument that it includes the casing, located in the casing holds the chamber and installs the laser instrument holds the laser instrument in the chamber, seted up on the casing intercommunication external with the laser instrument holds the heat dissipation channel in chamber, and is direct external with the laser instrument, is dispelled the heat to it by heat rejection apparatus, has removed the part that the casing conducts heat, guarantees that the laser instrument radiating rate is faster, terminal installation reflecting plate in the light path gets into the solitary light room of inhaling with light reflection and carries out the diffuse reflection processing, avoids light to turn back, causes the influence to the signal, set up the recess at the lateral part of tube -shape support, the point is also glued as the point with the connecting portion of laser instrument to the recess for it is three -dimensional that the position is glued to the