Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
190 words
In an apparatus for analysing by spectral absorption a gaseous mixture containing several molecular gases, said apparatus comprising one or more radiation sources for generating spectral components each having a wavelength characteristic of a respective vibrational-rotational-excitation band for one of said gases, modulator means for modulating each of said spectral components with a uniquely associated marking frequency, means for jointly directing said spectral components in the form of a measuring beam through said gaseous mixture onto a photoreceiver, and an evaluation circuit including electronic filter means tuned to each of said marking frequencies connected to receive signals from said photoreceiver and to deliver signals proportional to the intensity of the associated spectral component, the improvement wherein said photoreceiver is the photoreceiver of a two beam interferometer having a movable mirror, wherein means are provided for directing said spectral components from each said radiation source onto said movable mirror in the form of a collimated beam of light, and wherein means are provided for moving said movable mirror to and fro along said beam of light over at least a few wavelengths to modulate said spectral components at said marking frequencies.
Claim 2
Dependent Claim
190 words
In an apparatus for analysing by spectral absorption a gaseous mixture containing several molecular gases, said apparatus comprising one or more radiation sources for generating spectral components each having a wavelength characteristic of a respective vibrational-rotational-excitation band for one of said gases, modulator means for modulating each of said spectral components with a uniquely associated marking frequency, means for jointly directing said spectral components in the form of a measuring beam through said gaseous mixture onto a photoreceiver, and an evaluation circuit including electronic filter means tuned to each of said marking frequencies connected to receive signals from said photoreceiver and to deliver signals proportional to the intensity of the associated spectral component, the improvement wherein said photoreceiver is the photoreceiver of a two beam interferometer having a movable mirror, wherein means are provided for directing said spectral components from each said radiation source onto said movable mirror in the form of a collimated beam of light, and wherein means are provided for moving said movable mirror to and fro along said beam of light over at least a few wavelengths to modulate said spectral components at said marking frequencies.
Claim 3
Dependent Claim
34 words
An apparatus in accordance with claim 1 wherein said means for moving said movable mirror is adapted to move said mirror at a constant speed during each phase of said to and fro movement.
Claim 4
Dependent Claim
18 words
An apparatus in accordance with claim 1 or 2 wherein said two beam interferometer is a Michelson interferometer.
Claim 5
Dependent Claim
19 words
An apparatus in accordance with claim 1 in which said spectral components are generated by a single radiation source.
Claim 6
Dependent Claim
39 words
An apparatus in accordance with claim 1 in which said spectral components are generated by a plurality of secondary light sources formed by the spectral division of a single radiation beam containing all spectral components required for the analysis.
Claim 7
Dependent Claim
35 words
An apparatus in accordance with claim 5 in which said spectral division is formed by a reflection grating and a plurality of slots, said grating concentrating each of said spectral components into a corresponding slot.
Claim 8
Dependent Claim
25 words
An apparatus in accordance with claim 6 in which means are provided for moving said slots in a periodic modulating movement at said marking frequencies.
Claim 9
Dependent Claim
60 words
An apparatus in accordance with claim 5, 6, or 7 in which said reflection grating is periodically pivotable between two positions, and a spectral measuring component is generated at said slots when said grating is in one of said positions, and a spectral reference component is generated at said slots when said grating is in the other of said positions.