CN203587500U - Cambered surface electrode discharging-based laser-induced breakdown spectrum detecting system - Google Patents
Cambered surface electrode discharging-based laser-induced breakdown spectrum detecting system Download PDFInfo
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- CN203587500U CN203587500U CN201320759255.7U CN201320759255U CN203587500U CN 203587500 U CN203587500 U CN 203587500U CN 201320759255 U CN201320759255 U CN 201320759255U CN 203587500 U CN203587500 U CN 203587500U
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- 238000001228 spectrum Methods 0.000 title abstract description 9
- 238000007599 discharging Methods 0.000 title abstract description 8
- 230000015556 catabolic process Effects 0.000 title abstract 5
- 230000003595 spectral effect Effects 0.000 claims abstract description 18
- 238000009413 insulation Methods 0.000 claims abstract description 15
- 239000000523 sample Substances 0.000 claims description 32
- 238000002536 laser-induced breakdown spectroscopy Methods 0.000 claims description 31
- 238000012360 testing method Methods 0.000 claims description 16
- 238000001514 detection method Methods 0.000 claims description 8
- 239000013307 optical fiber Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 5
- 229910001080 W alloy Inorganic materials 0.000 claims description 3
- IADRPEYPEFONML-UHFFFAOYSA-N [Ce].[W] Chemical compound [Ce].[W] IADRPEYPEFONML-UHFFFAOYSA-N 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 abstract 1
- 230000000452 restraining effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 9
- 238000010891 electric arc Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 230000035939 shock Effects 0.000 description 4
- 230000006641 stabilisation Effects 0.000 description 4
- 238000011105 stabilization Methods 0.000 description 4
- 238000003754 machining Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 241000931526 Acer campestre Species 0.000 description 1
- 239000004484 Briquette Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000295 emission spectrum Methods 0.000 description 1
- 230000005281 excited state Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
The utility model discloses a cambered surface electrode discharging-based laser-induced breakdown spectrum detecting system belonging to the field of laser-induced breakdown spectrums. The cambered surface electrode discharging-based laser-induced breakdown spectrum detecting system is characterized in that a cambered surface electrode discharging device is additionally arranged on the basis of the conventional laser-induced breakdown spectrum detecting system. The cambered surface electrode discharging device is composed of a high-voltage power source, a capacitor, a high-voltage cable, an insulation layer and two cambered surface electrodes. A great deal of electric quantity can be injected into a laser-induced plasma through electrode discharging, so that a spectral signal is remarkably enhanced; meanwhile, a cylindrical cavity formed by the cambered surfaces of the electrodes and the insulation layer can be used for restraining the spatial form of the plasma and increasing the temperature and electron density of the plasma so that the spectral signal has high strength and good stability; the system is simple, reliable, relatively low in cost and good in practicability.
Description
Technical field
The utility model relates to Laser-induced Breakdown Spectroscopy detection system, and particularly a kind of Laser-induced Breakdown Spectroscopy detection system of improving spectral signal quality based on cambered surface electrode discharge, belongs to Laser-induced Breakdown Spectroscopy technical field.
Background technology
Laser-induced Breakdown Spectroscopy (laser-induced breakdown spectroscopy, LIBS) is a kind of brand-new material element analytical technology growing up in the twentieth century later stage, is a kind of typical atomic emission spectrum measuring technique.The principle of work of LIBS is: under intense laser pulse effect, the material of sample surfaces is provoked into as plasma decay rapidly, in attenuation process, give off the photon of characteristic frequency, produce characteristic spectral line, element kind and concentration information that its frequency and strength information have comprised analytic target.LIBS technical operation cost is low, and measuring speed is fast, have high sensitivity, without or need sample pretreatment seldom and realize the advantages such as multielement measurement, and radiationless harm has great development potentiality in commercial production.
But in actual applications,, LIBS detects and to have that sensitivity is lower, detectability is not enough and the repeated poor shortcoming of signal, thereby has limited the widespread use of this technology.In order to promote the development of LIBS technology, strengthening signal intensity, improving detectability, improve signal repeatability is the important research direction of LIBS technology.
In order to improve the intensity of LIBS signal, some researchers have proposed the method that spark discharge strengthens signal (as application number: 201120391281.X patent documentation; Application number: 200910154015.2 patent documentations, application number: 201110311616.7 patent documentations, application number: 200920199159.5 patent documentations).These methods by electric arc electric energy injected plasma, can obviously increase the intensity of LIBS signal, but because the electric arc of discharge generation is very unstable, and the effective machining area of sphere pole adopting is very little, cause signal stabilization deficiency and enhancement effect insufficient, the relative position of two electrodes need to be fixed respectively simultaneously, to practical operation, has brought inconvenience.
Utility model content
The deficiency and the defect that for prior art, exist, the utility model proposes a kind of Laser-induced Breakdown Spectroscopy detection system based on cambered surface electrode discharge, further to strengthen signal intensity, improve detectability and to improve signal repeatability, thereby LIBS technology is used widely.
The technical solution of the utility model is as follows:
A kind of Laser-induced Breakdown Spectroscopy detection system based on cambered surface electrode discharge, this system comprises pulsed laser, condenser lens, probe, optical fiber, spectrometer and computing machine, it is characterized in that: described system also comprises cambered surface electrode discharge device, cambered surface electrode discharge device is placed on testing sample surface, and described cambered surface electrode discharge device comprises the positive pole of high-voltage DC power supply, electric capacity, high-tension cable, insulation course, cambered surface electrode and the negative pole of cambered surface electrode; High-voltage DC power supply is in parallel by high-tension cable with electric capacity, the negative pole of the positive pole of cambered surface electrode and cambered surface electrode is connected with negative pole with the positive pole of high-voltage DC power supply by high-tension cable respectively, and described insulation course is between the positive pole of cambered surface electrode and the negative pole of cambered surface electrode; Between the negative pole of the positive pole of cambered surface electrode, cambered surface electrode and insulation course, form a cylindrical cavity; The pulse laser that pulsed laser sends center through cylindrical cavity after condenser lens focuses on impacts at the surface of testing sample generation plasma, the light signal that plasma sends is after probe, optical fiber and spectrometer are collected, light signal is converted to electric signal input computing machine, obtains the spectral signal of testing sample.
The material of described cambered surface electrode anode and cambered surface electrode negative pole is cerium tungsten alloy.
The degree of depth of described cylindrical cavity is 1mm～15mm, and diameter is 1mm～15mm.
The utlity model has following advantage and high-lighting effect: effective machining area of cambered surface electrode is much larger than sphere pole and can produce electric arc in plasma surrounding, thereby can the electric energy of storing in electric capacity be injected in plasma fully, the enhancement effect of spectral signal is more obvious, is conducive to improve the detectability that LIBS measures; Simultaneously owing to can plasma surrounding discharging, the electric arc producing is more stable, be conducive to improve the stability of spectral signal, and the shock wave of following in plasma generation process is acted on plasma by after the inwall of cylindrical cavity reflection, the energy that shock wave carries is on the one hand enhanced spectrum signal further, also effect of contraction has been played in the spatial shape of plasma and position on the other hand, the impact of the fluctuation of having avoided plasma space form and position on signal stabilization, is conducive to improve the stability of spectral signal.
Accompanying drawing explanation
Fig. 1 is the Laser-induced Breakdown Spectroscopy system diagram based on cambered surface electrode discharge.
Fig. 2 is cambered surface electrode discharge device structural drawing.
In figure: the positive pole of 1-cambered surface electrode; 2-insulation course; 3-cylindrical cavity; The negative pole of 4-cambered surface electrode; 5-high-voltage DC power supply; 6-electric capacity; 7-high-tension cable; 8-pulsed laser; 9-condenser lens; 10-plasma; 11-cambered surface electrode discharge device; 12-testing sample; 13-probe; 14-optical fiber; 15-spectrometer; 16-computing machine.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
Fig. 1 is the Laser-induced Breakdown Spectroscopy system diagram based on cambered surface electrode discharge, and this system comprises pulsed laser 8, condenser lens 9, cambered surface electrode discharge device 11, probe 13, optical fiber 14, spectrometer 15 and computing machine 16; Described cambered surface electrode discharge device 11 is placed on testing sample surface, and this device comprises the positive pole 1 of high-voltage DC power supply 5, electric capacity 6, high-tension cable 7, insulation course 2, cambered surface electrode and the negative pole 4 of cambered surface electrode; High-voltage DC power supply is in parallel by high-tension cable with electric capacity, the negative pole of the positive pole of cambered surface electrode and cambered surface electrode is connected with negative pole with the positive pole of high-voltage DC power supply by high-tension cable respectively, and described insulation course 2 is between the positive pole of cambered surface electrode and the negative pole of cambered surface electrode; Between the negative pole of the positive pole of cambered surface electrode, cambered surface electrode and insulation course, form a cylindrical cavity 3(as shown in Figure 2); The pulse laser that pulsed laser sends center through cylindrical cavity 3 after condenser lens focuses on impacts at the surface of testing sample 12 generation plasma 10, the light signal that plasma sends is after probe, optical fiber and spectrometer are collected, light signal is converted to electric signal input computing machine, obtains the spectral signal of testing sample.The material of described cambered surface electrode anode and cambered surface electrode negative pole adopts cerium tungsten alloy; Distance between the positive pole 1 of cambered surface electrode and the negative pole 4 of cambered surface electrode is that the width of insulation course 2 is D, and the size of D is preferably 1mm～15mm; The diameter of cylindrical cavity 3 is Φ, and the size of Φ is preferably 1mm～15mm; The degree of depth of cylindrical cavity is that the thickness of cambered surface electrode is H, and H size is 1mm～15mm; The voltage of high-voltage DC power supply is generally 3kV-15kV, and capacitance size is generally 5nF-10 μ F.
Principle of work of the present utility model and process are as follows:
Effective machining area of cambered surface electrode is much larger than sphere pole and can produce electric arc in plasma surrounding, thereby can the electric energy of storing in electric capacity be injected in plasma fully, the enhancement effect of spectral signal is more obvious, be conducive to improve signal to noise ratio (S/N ratio) and the detectability that LIBS measures, simultaneously owing to can plasma surrounding discharging, the electric arc producing is more stable, is conducive to improve the stability of spectral signal; And the shock wave of following in plasma generation process is acted on plasma by after the inwall of cylindrical cavity reflection, the energy that shock wave carries is on the one hand enhanced spectrum signal further, also effect of contraction has been played in the spatial shape of plasma and position on the other hand, the impact of the fluctuation of having avoided plasma space form and position on signal stabilization, is conducive to improve the stability of spectral signal.
The discharge process of described cambered surface electrode is passive, without manual control.When laser pulse does not send, in the middle of the cylindrical cavity that cambered surface electrode and insulation course form, there is free air bound exhausted, two electrodes cannot be discharged.When the center of laser pulse through cylindrical cavity impacts after sample surfaces, sample surfaces produces plasma, the resistance in cylindrical cavity is reduced greatly, two electrode transient switchings, produce arc discharge, thereby store electrical energy injected plasma in electric capacity.
The process of using device described in the utility model to detect testing sample is as follows:
Pulsed laser sends beam of laser pulse, and laser pulse impacts on testing sample surface through the cylindrical cavity of cambered surface electrode and insulation course formation after condenser lens focuses on, and produces laser induced plasma.In the cylindrical cavity of plasma between two cambered surface electrodes, ion in plasma and electronics reduce two resistance moments between electrode, thereby two electrode conductions, form the electric energy of storing in electric capacity by arc discharge is injected in plasma, causes atom, ion in plasma further fully to be excited.The optical radiation that the atom of excited state and ion send enters probe, after entering spectrometer by optical fiber, be converted into electric signal, electric signal can be obtained the spectrum of testing sample by computer acquisition, and the element that can obtain testing sample by analyzing spectral characteristic forms information.
Embodiment:
The standard coal sample ZBM098 of take is example, contrasts the spectral signal that conventional LIBS, sphere pole strengthen the carbon that LIBS, tri-kinds of technology of cambered surface electrode discharge LIBS described in the utility model obtain.Before experiment, coal sample is pressed into briquette as testing sample with sheeter.
Adopt ND:YAG pulsed laser, optical maser wavelength is 532nm, and laser energy is set to 35mJ, and the focal length of condenser lens is 20cm, and focus is positioned at the following 4mm in testing sample surface.Spectrometer is after laser pulse sends 1
μafter s, start collection signal.The diameter of phi of cylindrical cavity is 3mm, and depth H is 1.5mm.The voltage of high-voltage DC power supply is set to 7.5kV, and capacitance size is 20nF.The sphere pole diameter that is used for contrasting is 3mm, and the spacing between two electrodes is 3mm, and electrode is at the above 1.5mm of sample surfaces.20 diverse locations at sample surfaces gather 20 width spectral signals, try to achieve average strength and the relative standard deviation (RSD) of carbon spectral line C (I) 193.09nm, and signal to noise ratio snr, and plasma temperature and electron density are as shown in table 1.
The spectral characteristic contrast of table 1. different technologies scheme
As shown in Table 1, the LIBS spectrum of the cambered surface electrode discharge device gained that utilization the utility model proposes, than conventional LIBS and globular discharge LIBS, there is stronger signal intensity, larger signal to noise ratio (S/N ratio), higher plasma temperature and electron density, therefore can improve the detectability that LIBS measures, meanwhile, the cambered surface electrode discharge device that utilization the utility model proposes can reduce the RSD of signal greatly, can improve the stability of signal.Generally speaking, the cambered surface electrode discharge device that the utility model provides, simple to operate, with low cost, can greatly strengthen signal intensity, improve detectability and signal stabilization.
Claims (3)
1. the Laser-induced Breakdown Spectroscopy detection system based on cambered surface electrode discharge, this system comprises pulsed laser (8), condenser lens (9), probe (13), optical fiber (14), spectrometer (15) and computing machine (16), it is characterized in that: described system also comprises cambered surface electrode discharge device (11), cambered surface electrode discharge device (11) is placed on testing sample surface, described cambered surface electrode discharge device comprises high-voltage DC power supply (5), electric capacity (6), high-tension cable (7), insulation course (2), the negative pole (4) of the positive pole of cambered surface electrode (1) and cambered surface electrode, high-voltage DC power supply is in parallel by high-tension cable with electric capacity, the negative pole of the positive pole of cambered surface electrode and cambered surface electrode is connected with negative pole with the positive pole of high-voltage DC power supply by high-tension cable respectively, and described insulation course (2) is between the positive pole of cambered surface electrode and the negative pole of cambered surface electrode, between the negative pole of the positive pole of cambered surface electrode, cambered surface electrode and insulation course, form a cylindrical cavity (3), the pulse laser that pulsed laser sends center through cylindrical cavity (3) after condenser lens focuses on impacts at the surface of testing sample (12) generation plasma (10), the light signal that plasma sends is after probe, optical fiber and spectrometer are collected, light signal is converted to electric signal input computing machine, obtains the spectral signal of testing sample.
2. a kind of Laser-induced Breakdown Spectroscopy detection system based on cambered surface electrode discharge according to claim 1, is characterized in that: the material of described cambered surface electrode anode and cambered surface electrode negative pole adopts cerium tungsten alloy.
3. a kind of Laser-induced Breakdown Spectroscopy detection system based on cambered surface electrode discharge according to claim 1, is further characterized in that: the degree of depth of cylindrical cavity is 1mm～15mm, and diameter is 1mm～15mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320759255.7U CN203587500U (en) | 2013-11-26 | 2013-11-26 | Cambered surface electrode discharging-based laser-induced breakdown spectrum detecting system |
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| CN201320759255.7U CN203587500U (en) | 2013-11-26 | 2013-11-26 | Cambered surface electrode discharging-based laser-induced breakdown spectrum detecting system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103712959A (en) * | 2013-11-26 | 2014-04-09 | 清华大学 | Cambered surface electrode discharging-based laser-induced breakdown spectroscopy detection system |
| CN110196244A (en) * | 2018-02-26 | 2019-09-03 | 成都艾立本科技有限公司 | A kind of method and device enhancing laser induced breakdown spectroscopy signal |
-
2013
- 2013-11-26 CN CN201320759255.7U patent/CN203587500U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103712959A (en) * | 2013-11-26 | 2014-04-09 | 清华大学 | Cambered surface electrode discharging-based laser-induced breakdown spectroscopy detection system |
| CN103712959B (en) * | 2013-11-26 | 2016-01-13 | 清华大学 | A kind of Laser-induced Breakdown Spectroscopy detection system based on cambered surface electrode discharge |
| CN110196244A (en) * | 2018-02-26 | 2019-09-03 | 成都艾立本科技有限公司 | A kind of method and device enhancing laser induced breakdown spectroscopy signal |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140507 Effective date of abandoning: 20160113 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |