The invention provides a spot-type photoelectric
smoke detector having the same sensitivity to
black smoke and white
smoke, and a detection method thereof. The spot-type photoelectric
smoke detector comprises a
detector and a detector base, wherein the detector is clamped on the detector base; the detector comprises a detector upper cover, a labyrinth and a circuit board which is arranged in the labyrinth; a patch
light emitter and a patch light
receiver are attached to the circuit board; the labyrinth is installed in the detector upper cover; the labyrinth comprises a labyrinth cover and a labyrinth base which is clamped with the labyrinth cover; an
insect-proof net is provided on a top surface of the labyrinth cover; a light-emitting component and a light-receiving component are disposedin the labyrinth; the light-emitting component finally forms a cone-shaped main emitting light path with a light-exiting surface as a bottom surface; the light-receiving component finally forms a cone-shaped main receiving light path with a center of a light incident surface of the light
receiver as a cone top; and a region where
scattered light of the main emitting light path can irradiate an light incident surface of the light-receiving component is a smoke detection region. According to the detector provided by the invention, the smoke detection function of the detector having the same sensitivity to the
black smoke and the white smoke can be implemented by using the
single patch light emitter and patch light
receiver; all functions of a composite smoke and
heat detector can be implemented by
welding the patch
heat detector; the smoke enters the detector smoothly; the smoke concentrations inside and outside the labyrinth are the same under different
airflow environments and have noobvious differences in
azimuth; and the effects of full patching, no screwing,
miniaturization and low cost can be implemented.