EP2580577A1 - Apparatus for carrying out laser spectroscopy, sorting system having the apparatus, and method for carrying out laser spectroscopy - Google Patents
Apparatus for carrying out laser spectroscopy, sorting system having the apparatus, and method for carrying out laser spectroscopyInfo
- Publication number
- EP2580577A1 EP2580577A1 EP11757530.8A EP11757530A EP2580577A1 EP 2580577 A1 EP2580577 A1 EP 2580577A1 EP 11757530 A EP11757530 A EP 11757530A EP 2580577 A1 EP2580577 A1 EP 2580577A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- laser
- sample
- plasma
- axicon
- radiation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/71—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light thermally excited
- G01N21/718—Laser microanalysis, i.e. with formation of sample plasma
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
- G01N2201/063—Illuminating optical parts
- G01N2201/0638—Refractive parts
Definitions
- Apparatus for carrying out laser spectroscopy, sorting installation comprising the apparatus and method for carrying out laser spectroscopy
- the invention relates to a device for carrying out laser spectroscopy, a sorting system, comprising the device and a method for carrying out laser spectroscopy, in which at least one pulsed laser focuses on at least one ablation region of a sample to generate a plasma via at least one optical element Plasma detected and based on the radiation spectrum of the detected radiation, an elemental analysis is performed.
- the invention is therefore based on the object to improve a method of the type described in such a simple manner that repeatable extremely accurate elemental analysis based on a laser-induced plasma can be ensured.
- the method should be universally applicable and easy to handle.
- the invention achieves the stated object with regard to the method in that the laser generates focusing plasma on at least two ablation regions of the sample lying in the focal region of the axicon via an optical element designed as an axicon.
- the laser generates, via an optical element formed as an axicon, at least two ablation regions of the sample lying in the focal region of the axicon.
- kussierend plasma then a very universal method can be easily enabled. Namely, on the basis of at least two ablation regions, a generation of a sufficiently radiation-intensive plasma can be expected with a high probability, so that a very wide variety of sample shapes can be subjected to a stable elemental analysis.
- the comparatively long focal depth can be used to ensure a constant ablation and thus for a reproducible plasma generation even with different sample arrangements compared to the laser optics.
- the method can therefore be distinguished from the prior art not only by its universal and simple usability based on a relatively high tolerance in the sample arrangement and / or size, but also by a high stability.
- an element analysis becomes comparatively resistant to disturbing influences, in particular to dust particles in the beam path of the laser.
- the self-reconstruction of the Bessel beam can be used to eliminate disturbances in the irradiation of the ablation areas, so that a reproducible plasma can be ensured even with different environmental parameters.
- the focus area of an axicon can be defined by its depth of focus and focus width.
- this focus area can become form vertically and / or laterally one or more maxima (circular or ring-shaped circular).
- maxima circular or ring-shaped circular.
- the envelope of all areas can now be defined as a focus area. In the figure section, this focus area can be displayed as a rhombus.
- a laser-induced plasma is generated.
- it can increase the intensity of the plasma, which can provide for improved elemental analysis.
- the method and the device can have a particularly advantageous effect if an optical element designed as an axicon is used to focus a pulsed laser beam on at least two ablation regions of a sample at least partially lying in the focal region of the axicon for performing laser spectroscopy.
- the invention has also set itself the task of improving an apparatus for performing a laser spectroscopy of the type described above such that compared to geometric variations on a sample extremely stable a reproducible element analysis can be ensured.
- the invention should be structurally simple.
- the invention achieves the stated object with regard to the device in that an optical element designed as an axicon for focusing the beam path is provided in the beam path of the laser on at least two ablation regions of the specimen located in the focal region of the axicon.
- the beam path of the laser can be focused on at least two ablation areas in a structurally simple manner if the sample or its ablation regions lies or lie in the focal region of the axicon. Therefore, in contrast to the prior art, it is not only possible to dispense with a structurally complex "autofocus optic", because advantageously the focal region of the axicon or its comparatively long focal depth can be utilized, but according to the invention it is also possible to Therefore, according to the invention, the influence of different geometrical dimensions of the samples to be examined and / or different layers of the samples can be compensated the laser optics are kept comparatively small on the element analysis, so that a particularly stable device can be created in a structurally simple manner.
- a particularly suitable for elemental analysis plasma can be created when two plasmas of the respective Ablations Schemee overlap at least partially. Namely, homogeneity of the plasma can be improved with such a mixture of various plasma parts. It is also conceivable that it can be used to create a more resistant to contamination radiation generation, which can lead to improved results in elemental analysis. If the sample has a circular ablation area and at least one ring-shaped ablation area surrounding the circular ablation area, then a comparatively large plasma with a high intensity can be created. In particular, however, by enclosing the circular ablation region a comparatively large overlap of the plasmas for improved homogeneity can be made possible, which can have a positive effect on the results of the elemental analysis.
- Particularly advantageous conditions for creating a stable sorting system can be made possible if the device is used to perform a laser spectroscopy of a respective sample in a sorting system for sorting samples.
- FIG. 1 is a schematic view of the apparatus for performing a laser spectroscopy
- FIG. 3 shows a side view of the plasmas of the ablation regions according to FIG. 2
- FIG. 4 shows a schematic view of a sorting system with the device according to FIG. 1.
- the device 1 shown for example in FIG. 1 has a laser 2 which generates laser pulses.
- a laser 2 which generates laser pulses.
- an optical element 4 is provided, which the beam path 3 to at least one ablation region 5 of the sample 6 focused.
- a laser-induced plasma 7 is thus produced which causes an emission or radiation 8.
- the radiation 8 is recorded by a detector 9 (for example, by a spectroscope or also a spectrometer), with an associated analysis device 10 being able to deduce the chemical composition of the sample 6 based on the radiation spectrum of the detected radiation 8.
- the beam path 3 of the laser 2 designed as an axicon 11 optical element 4 is provided, the beam path 3 to three Ablations Schemee 5 ', 5 "and 5"' of Sample 6 focuses, which can be better seen in FIG.
- the sample 6 is in the focus area 12 of the axicon 11. Due to the large number of ablation areas 5 ', 5 "and 5"' at least one plasma 7 ', 7 "and / or 7"' with a sufficient radiation intensity for the optical detector 9 are ensured, so that the method for performing a laser spectroscopy of the shape and / or position of the sample 6 in the beam path 3 of the laser 2 is independent.
- the device 1 can therefore always ensure exact focusing on the respective ablation regions 5 ', 5 "and 5"' without special measures, which, in contrast to the prior art, can always ensure reproducible plasma generation. Moreover, a waiver of an "autofocus optics" creates a comparatively structurally simple and stable device 1. It is generally mentioned that the method according to the invention and also the device according to the invention are used not only to carry out laser spectroscopy but also to carry out laser spectrometry can be. As can be seen in particular from FIG.
- the ablation regions 5' and 5" become each other on the sample
- This arrangement can be determined, for example, by the optical characteristics of the axicon 11 and / or the laser wavelength, and the intensity of the ablation can preferably be set via the laser power
- an interaction eg: mixing, homogenization, energy exchange, etc.
- plasma changes for example due to impurities 15
- the process can thereby be relatively stable.
- FIG. 4 a sorting system 16 with the device 1 according to FIG. 1 is shown schematically.
- the sorting system 16 has differently shaped samples 6, 6 ', 6 "and 6"', which are transported on a conveyor belt 17 of a conveyor 18 to the device 1.
- the sample 6 is subjected to laser spectroscopy by the device 1, in which a plasma 7 is generated for an analysis of the sample 6, as has already been explained in detail in the preceding figures 1 to 3.
- the samples 6, 6 ', 6 "and 6"' now moved into the focus area 12 of the axicon 11 - the focus area 12 has already been shown in detail in Fig. 1.
- this can be comparatively simple in design because the comparatively long focal depth 12 'of the axicon 11 does not require precise guidance of the samples 6, 6', 6 "and 6"'. Thus, even with inaccurate positioning can always be expected with an exact focus in the focus area 12.
- the sorting system 16 is therefore comparatively simple in design.
- sorting of the conveyed samples 6, 6 ', 6 "and 6"' is performed by a sorting device 19 as schematically shown in FIG is.
- a sorting device 19 as schematically shown in FIG is.
- the sorting system 16 in which the device 1 according to the invention is used to carry out laser spectroscopy, samples can be sorted into the particle area.
- the sorting system 16 is comparatively stable, because a secure focusing and thus sorting of samples can be ensured without an "autofocus optics.”
- the device 1 can also generate a special homogeneous plasma 7, which can exclude sorting errors particularly well.
- Plasma generation can therefore be kept low even in relatively heavily particle-loaded focus areas 12, which makes the device particularly stable - and such a device 1 is particularly suitable for sorting systems 16 with comparatively high dust loads.
Landscapes
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Pathology (AREA)
- Immunology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- Plasma & Fusion (AREA)
- Engineering & Computer Science (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Optics & Photonics (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102010034438A DE102010034438A1 (en) | 2010-08-16 | 2010-08-16 | Method for carrying out laser spectroscopy, device for carrying out the method and sorting system comprising the device |
PCT/AT2011/000344 WO2012021912A1 (en) | 2010-08-16 | 2011-08-12 | Apparatus for carrying out laser spectroscopy, sorting system having the apparatus, and method for carrying out laser spectroscopy |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2580577A1 true EP2580577A1 (en) | 2013-04-17 |
Family
ID=44650727
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11757530.8A Withdrawn EP2580577A1 (en) | 2010-08-16 | 2011-08-12 | Apparatus for carrying out laser spectroscopy, sorting system having the apparatus, and method for carrying out laser spectroscopy |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2580577A1 (en) |
DE (1) | DE102010034438A1 (en) |
WO (1) | WO2012021912A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EA037486B1 (en) * | 2017-02-10 | 2021-04-02 | Эмджен Инк. | Imaging system for counting and sizing particles in fluid-filled vessels |
CN116329769B (en) * | 2023-05-29 | 2023-08-04 | 上海凯来仪器有限公司 | Laser ablation laser ionization device, method and mass spectrometer |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4118274A (en) * | 1975-05-29 | 1978-10-03 | The United States Of America As Represented By The United States Department Of Energy | System for the production of plasma |
DE3342531A1 (en) * | 1983-11-24 | 1985-06-05 | Max Planck Gesellschaft | METHOD AND DEVICE FOR GENERATING SHORT-LASTING, INTENSIVE IMPULSES OF ELECTROMAGNETIC RADIATION IN THE WAVELENGTH RANGE UNDER ABOUT 100 NM |
DE10229498A1 (en) | 2002-07-01 | 2004-01-22 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Method and device for performing plasma emission spectrometry |
GB0403865D0 (en) * | 2004-02-20 | 2004-03-24 | Powerlase Ltd | Laser multiplexing |
-
2010
- 2010-08-16 DE DE102010034438A patent/DE102010034438A1/en not_active Withdrawn
-
2011
- 2011-08-12 EP EP11757530.8A patent/EP2580577A1/en not_active Withdrawn
- 2011-08-12 WO PCT/AT2011/000344 patent/WO2012021912A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2012021912A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE102010034438A1 (en) | 2012-02-16 |
WO2012021912A1 (en) | 2012-02-23 |
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