초록 ▼

In an optical absorption gas sensor there is a practical problem of obtaining a sufficiently long optical path necessary to provide the required sensitivity within a compact space. In the present invention the path length can be multiplied to about 2 meters in a hemispheric like chamber having a rad

In an optical absorption gas sensor there is a practical problem of obtaining a sufficiently long optical path necessary to provide the required sensitivity within a compact space. In the present invention the path length can be multiplied to about 2 meters in a hemispheric like chamber having a radius about 8 cm. A novel, compact and inexpensive cell structure for increasing the optical path length by multiple reflections is provided.

대표청구항 ▼

A folded path optical type absorption cell gas sensor comprising: an absorption cell gas sensor enclosure; a spherical shaped reflector forming part of the enclosure of the absorption cell; said enclosure further including a base section having mounted thereon an annular shaped mirror complex, said

A folded path optical type absorption cell gas sensor comprising: an absorption cell gas sensor enclosure; a spherical shaped reflector forming part of the enclosure of the absorption cell; said enclosure further including a base section having mounted thereon an annular shaped mirror complex, said annular mirror complex comprising a plurality of mirror pairs, each of said mirror pairs having a first mirror element and a second mirror element, the first mirror element being set at an angle nearly perpendicular to the second mirror element in each of said mirror pairs, and wherein said mirror pairs are each generally directed towards the apex of the spherical reflector; a source of light; detector means; a multifolded light beam directed from said source towards the apex of said spherical reflector and reflected therefrom onto said first mirror element of the first of said mirror pairs, reflected therefrom to the second mirror element thereof, reflected therefrom by way of spherical reflector to the first mirror element of the second mirror pair, the multifolding sequence continuing until the light beam traverses all of said plurality of mirror pairs and is finally reflected to said detector means.