| 摘要 |
[Problem] To provide a scattered light-type smoke detection apparatus, wherein internal scattered light in a smoke detection space is suppressed and an S/N ratio is improved. [Solution] A scattered light-type smoke detection apparatus (1) is provided with: a smoke detection space (20), which is provided in a light-shielded region that is shielded from light from the outside, and has smoke particles flow therein from the outside; a light emitter (30) which emits detection light toward the smoke detection space (20); and a light receiver (40), which receives scattered light generated when the detection light that has been emitted from the light emitter (30) is scattered by means of the smoke particles that have flowed into the smoke detection space (20). The scattered light-type smoke detection apparatus is characterized in being provided with an internal scattered light suppressing means, which suppresses the internal scattered light in the light-shielded region by guiding, while transmitting, a part of or the whole detection light to a predetermined region or to the outside of the light-shielded region, said detection light having been emitted from the light emitter (30), and passed through the smoke detection space (20). |
