CPC G01N 21/3504 (2013.01) | 20 Claims |
1. A device, comprising:
a support having a bearing surface;
a spacer body coupled to the bearing surface of the support, the spacer body having an emission opening and a reception opening, the reception opening including a first radiation-limitation wall portion, and the first radiation-limitation wall portion includes a first side and a second side opposite to the first side, the first and second sides are transverse to the bearing surface, the emission opening is on the first side of the first radiation-limitation wall portion, and the reception opening is on the second side of the first-radiation limitation wall portion and is closer to the first-radiation limitation wall portion than the emission opening;
a mirror element coupled to the spacer body, the mirror element having a reflecting surface;
a light-emitting element on the bearing surface in the emission opening and facing the reflecting surface; and
a light-receiving element on the bearing surface in the reception opening and facing the reflecting surface.
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