초록 ▼

A gas analyzer which utilizes an infrared beam which passes through or has emanated from a gas stream. The analyzer has a plurality of gas cells which contain gas of the type whose concentration is being measured in various concentrations and at various total pressures. A beam of energy is forwarded

A gas analyzer which utilizes an infrared beam which passes through or has emanated from a gas stream. The analyzer has a plurality of gas cells which contain gas of the type whose concentration is being measured in various concentrations and at various total pressures. A beam of energy is forwarded to the analyzer, and is passed selectively to the various cells. In one embodiment, the cells are mounted where a rotatable deflector can selectively deflect and receive the beam to and from two fixed beam segments so that sequential readings at an infrared detector can provide measurements of concentrations, and calibration. In another embodiment, the cells are selectively moved into the beam path. The beam is formed and forwarded by a Cassegrainean system or by a combination of reflectors including a retro-reflector. An infrared calibration beam which does not pass through the gas stream is utilized for calibration.

대표청구항 ▼

In an instrument for measuring the concentration of a gas in a stream of other gases, utilizing a beam of spectral energy which has passed through or emanated from at least some part of said stream, an analyzer comprising: a plurality of gas cells spaced apart from one another; an initial reflector;

In an instrument for measuring the concentration of a gas in a stream of other gases, utilizing a beam of spectral energy which has passed through or emanated from at least some part of said stream, an analyzer comprising: a plurality of gas cells spaced apart from one another; an initial reflector; a rotatable deflector, comprising a pair of deflecting reflectors rotatably carried by it, said deflecting reflectors forming an angle with one another, the center of rotation of said deflector lying inside said angle; means for rotating said deflector; a spectral source or a spectral detector, said cells, initial reflector, rotatable deflector and source or detector being fixedly located relative to one another such that fixed beam segments of said beam are formed between the initial reflector and the rotatable deflector, and between the rotatable deflector and the source or detector, and an angularly movable beam segment of said beam is formed between each of the deflecting reflectors of the rotatable deflector and the locus of said cells which movable beam segments can be moved from cell to cell as the consequence of rotation of the rotatable deflector, a first of said movable beam segments extending from one of said deflecting reflectors to said cell locus, and the other of said movable beam segments extending from the said locus to the other of said deflecting reflectors; and reflecting means adjacent to each said cell for reflecting the beam from one of said movable beam segments to the other, after the beam has passed through the cell at least once.