Patent ID: 11921031
Assignee: ELICHENS
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A Gas sensor comprising an enclosure configured to receive a gas, the enclosure comprising a sidewall that extends, about a transverse axis, between a first wall and a second wall, the sensor also comprising:
a light source configured to emit a light wave that propagates through the enclosure and forms, from the light source, a first light cone; and
a measuring photodetector configured to detect a light wave emitted by the light source and propagating through the enclosure;
the sensor being such that the first wall and the second wall each comprise at least one reflective surface, forming a portion of an ellipsoid of revolution, with each reflective surface being associated with a rank n, n being an integer higher than or equal to 1, such that the sensor comprises:
a first reflective surface of rank 1, having a first focal point and a second focal point, the first reflective surface being placed facing the light source, the first reflective surface forming a portion of an ellipsoid of revolution associated with an ellipse the eccentricity of which is lower than or equal to 0.7; and
at least one reflective surface of rank n strictly higher than 1, each reflective surface of rank n having:
a first focal point, coincident with the second focal point of a reflective surface of preceding rank n−1;
a second focal point, distinct from the first focal point and coincident with the first focal point of a reflective surface of following rank n+1; and

a last reflective surface of rank N, comprising a first focal point coincident with the second focal point of a reflective surface of preceding rank, the last reflective surface also comprising a second focal point;
such that the light wave emitted by the light source is successively reflected by the N ellipsoidal-of-revolution reflective surfaces, according to their respective rank, before converging towards the second focal point of the last reflective surface in such a way as to form a last light cone, the measuring photodetector being placed so as to lie in the last light cone.