| 摘要 |
<p>This detector is provided with a light emitting section, a light receiving section, and a light guide body which has a detection space for specifying the state of a predetermined gas and which conducts light emitted from the light emitting section to the light receiving section through the detection space. The light guide body has, on the inner surface of the detection space, a reflection surface for reflecting the light emitted from the light emitting section. The reflection surface is an elliptical concave surface, the major axis of which being a straight line defined by both the light emitting section and the light receiving section. The reflection surface has a first focal point at the position of the light emitting section and has a second focal point located on the opposite side of the light receiving section from the first focal point.</p> |
