Apparatus for spectroscopic analysis with modulated electrodeless discharge tube
阅读：440发布：2021-11-16
专利汇可以提供Apparatus for spectroscopic analysis with modulated electrodeless discharge tube专利检索，专利查询，专利分析的服务。并且A gas, or electrodeless, discharge lamp for use in spectroscopic analysis is excited in a microwave field of sufficiently high intensity to maintain a high-residual ion concentration within said lamp to reestablish the discharge therein with minimal delay. Also, the microwave field exciting the lamp is modulated, whereby the emission, or beam, from the lamp irradiating an atomic vapor is modulated in ''''on-off'''' fashion without physical obstruction of said beam.，下面是Apparatus for spectroscopic analysis with modulated electrodeless discharge tube专利的具体信息内容。
1. A method for effecting spectroscopic analysis comprising the steps of: developing an atomic vapor containing a material whose concentration is to be determined, generating and exciting said vapor with a beam of electromagnetic radiation containing a spectral line characteristic of a material contained in said vapor, said beam being generated by positioning an electrodeless discharge lamp in a microwave field, modulating said microwave field with a superimposed modulation to modulate said beam in onoff fashion, the frequency of said superimposed modulation being sufficiently high to maintain sufficient residual ions within said tube to initiate ionization therein without substantial delay, irradiating said vapor with said modulated beam without physically obstructing said beam, and detecting the emission from said vapor to determine the concentration of said material.
2. The method of claim 1 further comprising the steps of detecting an emission from said vapor consequent upon irradiation of said vapor, and deriving an electrical signal therefrom, amplifying the electrical signal in phase with said superimposed modulation, and recording the amplified signal to indicate the concentration of said material in said vapor.
3. The method of claim 2, further comprising the steps of detecting the emission from said vapor in alignment with the modulated beam for carrying out analysis by atomic absorption spectroscopy.
4. The method of claim 2, further comprising the steps of detecting the emission from said vapor at an angle to the modulated beam for carrying out analysis by atomic fluorescence spectroscopy.
5. The method of claim 4, further comprising the step of detecting the emission From said vapor at 90* to the modulated beam.
6. A device for spectroscopic analysis comprising: means for developing an atomic vapor containing a material whose concentration is to be determined, an electrodeless discharge tube, means for positioning said tube in a microwave field so as to excite said tube and produce a beam of electromagnetic radiation having a spectral line characteristic of said material, said tube when excited being positioned to irradiate said vapor, means for modulating said microwave field with a superimposed modulation of sufficient amplitude to modulate said beam irradiating said vapor in on-off fashion without physical obstruction of said beam, the frequency of said superimposed modulation being sufficiently high to maintain sufficient residual ions within said tube to initiate ionization therein without substantial delay, and means for detecting emission from said vapor to determine the concentration of said material.
7. An apparatus as claimed in claim 6, further comprising means responsive to said detecting means for deriving an electrical signal therefrom, means for amplifying the electrical signal in phase with the modulation of the beam, and means for recording said electrical signal to indicate the concentration of said material.
8. An apparatus as claimed in claim 7, wherein said detecting means comprises a monochromator and photomultiplier sequentially aligned with said tube and said developing means for determining the concentration of said material by atomic absorption spectroscopy.
9. An apparatus as claimed in claim 7, wherein said detecting means comprises a monochromator and photomultiplier sequentially aligned on a line at an angle to the line between said tube and said developing means for determining the concentration of said material by atom fluorescence spectroscopy.
10. An apparatus as claimed in claim 6 wherein said exciting means comprises a resonant cavity for receiving said tube and a microwave generator connected to said cavity for producing said microwave field to excite said tube, and means for modulating the power output from said generator to produce a corresponding modulation in said microwave field and in said beam produced by said tube.
11. An apparatus as claimed in claim 10, wherein said generator is biased at a predetermined DC potential.
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