IL42850A - Spectrometer system - Google Patents

Claims (2)

1. *' CLAIMS. 1. In a spectrometer system including a radiant energy source, a scanning spectrometer, only a single entrance slit disposed between said source and said spectrometer, said source producing a focused radiant energy beam passing through said entrance slit and into said spectrometer, said spectrometer having a single fixed exit slit whereby a radiant energy pat&is established from iaid source through said entrance slit and through said spectrometer and out said exit slit, said system including a pho omultiplier detector in said radiant energy path aft and scyaced from said exit slit, an absorption cell adapted to contain a medium to be investigated, said cell communicating with said radiant energy path between said exit sli and said detector, said system having no correlation mask corresponding to a medium to be investigated in said cell, the improvement comprising means for movably mounting said entrance slit, said means including means for rectilinea ly reciprocating sai entrance slit at a constant and rapid frequency to modulate the wavelength of the radiant energy beam detected in a sinusoidal manner.

2. In the system as defined in claim 1 wherein said detecto includes a photomultlplier tube having grid wires, said movable entrance slit being located in the radiant energy path between said source and spectrometer whereby radiant energy interference on said grid wire is non-existent. 11. In a spectrometer system including a radiant energy source, a spectrometer* only a single entrance slit disposed between said source and said spectrometer, said source producing a focused radiant energy beam passing through said entrance slit and into said spectrometer, said spectrometer having a single fixed exit slit whereby a radiant energy path is established from said source through said entrance slit and through said spectrometer and out said exit slit, said system including a photoaultipller detector, and absorption cell adapted to contain a medium to be investigated , said cell communicating with said radiant energy path between said exit slit and said detector, said detector receiving said radiant energy after passage thereof through said cell and producing an output signal, the improvement comprising means for movably mounting said entrance slit, said mtans including means for rectilinearly reciprocating said entrance slit at a constant and rapid frequency to modulate the wavelength of radiant energy beam detected in a sinusoidal manner, a po entiometrlc recorded for producing a ratio of two signals both derived from said output signal of said detector whereby said ratio is Invariant with changes in the intensity of sa d source. - 42850/2 r 12 spectrometer system including a radiant energy source, a scanning spectrometer, said source producing a focused energy beam passing Into said spectrometer, said system including a photomultiplier detector, an absorption cell adapted to contain a medium to fee investigated, means for sinusoldally varying the : wavelength of the radiant energy beam from said source into ..said spectrometer at a constant and rapid frequency, said means including a single rectilinearly reciprocating, entrance slit between said source and said spectrometer, said sinusoldally