Patent ID: 8368895

Claim:
A gas analysis arrangement comprising: a chamber adapted to contain a sample of gas, the chamber having first and second opposing ends defining a chamber, wherein at least first and second opposing sides extend between the first and second ends have opposing surface with light reflecting properties within the chamber, a light-emitting means disposed in the first end, a light-receiving means for receiving light that has been reflected through said chamber disposed in the second end opposite the first end, and an electronic circuit adapted by means of spectral analysis to analyze and determine the presence of a selected gas or mixture of gases present as a sample of gas within said chamber, whereby opposite arranged surfaces within the chamber offer light-reflecting properties as a wave guide, wherein said chamber includes one or more apertures for the passage of the gas into and out of said chamber, the chamber has an extended shape, and said one or more apertures are located in the chamber between said light-emitting means and said light-receiving means, wherein the first side of the chamber has a curved shape with its concave surface facing into said chamber, said one or more apertures are located and extended between said light-emitting means and said light-receiving means, and said one or more apertures have a size and a longitudinal extent that allows an exchange of one sample of gas within the chamber for another, wherein said chamber includes said one or more apertures disposed on the second side opposite to said concave surface, said light-emitting means and said means of receiving reflected light are located at the ends of said concave surface, a central line of a light beam is connected to a direction of a tangent oriented through the concave curved surface and a section of the concave curved surface that is located next to the light-emitting means, and wherein all of the one or more apertures are located only on the second side of the chamber.