| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a turbidity sensor capable, in a compact and simple structure though, of compensating for a change in the ambient temperature or a change in the luminous energy of a light-emitting element, even when a placement interval between the light-emitting element and a detection-purpose light-receiving element is narrowed due to downsizing.SOLUTION: Provided is a turbidity sensor 1 comprising: a sensor body 4 provided with two cavity parts 2, 3 provided with openings 8, 9 disposed adjacent to each other with an interval therebetween, and having light shading properties; a light-emitting element 5 disposed inside the cavity part 2 and provided with a semiconductor element for emitting light in a direction toward the opening 8 of the cavity part 2 in a prescribed irradiation angle rangeθ; a detection-purpose light-receiving element 6 disposed in the cavity part 3 and used for receiving incident light from the opening 9 of the cavity part 3; and compensation-purpose light-receiving means disposed at least partly inside the cavity part 2 and used for receiving light leaking to the outside of the irradiation angle rangeθof the light-emitting element 5.</p> |
