Patent ID: 9645073
Date: 2017-05-09
CPC Classifications: G01N

Claim:
1. An optical chamber for a gas detection device, comprising: a reflecting device configured to reflect radiation issued from a radiation source and to redirect the radiation toward a radiation detector; an entrance located facing the radiation source; and an exit located facing the radiation detector, wherein: the reflecting device includes a first series of adjacent mirrors (Mi), and a second series of adjacent mirrors (M′i); the mirrors (Mi) of the first series and the mirrors (M′i) of the second series have two focal points; the first series of mirrors and the second series of mirrors are arranged relative to each other so that the radiation emitted by the radiation source is reflected alternatively by a mirror (M′i) of the second series and by a mirror (Mi) of the first series and follows a circular optical path extending from the radiation source to the radiation detector; the optical chamber comprises two portions fastened to each other, a lower portion in which the mirrors (Mi) of the first series are formed and an upper portion joined to the lower portion and in which the mirrors (M′i) of the second series are formed; each of the first series of mirrors and the second series of mirrors is arranged in an arc in an overhead plan view of the optical chamber; a first mirror (Mi) of the first series of adjacent mirrors includes a first opening as the entrance to receive radiation from the radiation source; and a last mirror of the first series of adjacent mirrors includes a second opening as the exit to output radiation to the radiation detector.