Flattened micro smoke detection sensor and working method thereof

The invention relates to a flattened micro smoke detection sensor and a working method thereof. The micro smoke detection sensor comprises two unpackaged light sources, at least one unpackaged detector, a PCB substrate and a shell, wherein the light sources, the detector and the shell are all fixed on the PCB substrate, the light sources and the detector are located in the shell, the two light sources emit different wavelengths, a plurality of air holes are formed in the top of the shell, a light absorption layer is arranged on the inner wall of the top of the shell, two light sources emitting different wavelengths and at least one detector are arranged in the sensor, and misjudgment caused by dust entering can be effectively avoided through the two light sources emitting different wavelengths. According to the invention, a flattened packaging mode based on a microelectronic technology is adopted, so that the acquisition efficiency is ensured; and in the sensor manufacturing process, a bare chip can be adopte