CN101592609A - The device for fast detecting of multichannel Laser-induced Breakdown Spectroscopy - Google Patents
The device for fast detecting of multichannel Laser-induced Breakdown Spectroscopy Download PDFInfo
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- CN101592609A CN101592609A CNA2009100408147A CN200910040814A CN101592609A CN 101592609 A CN101592609 A CN 101592609A CN A2009100408147 A CNA2009100408147 A CN A2009100408147A CN 200910040814 A CN200910040814 A CN 200910040814A CN 101592609 A CN101592609 A CN 101592609A
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Abstract
The invention discloses a kind of device for fast detecting of multichannel Laser-induced Breakdown Spectroscopy, this device comprises laser instrument, sample placement position, light transmission component, monochromator and signal processing apparatus, laser instrument is placed the position towards sample, on monochromator, be provided with entrance slit and exit slit, the place is provided with photo-electric conversion element at exit slit, and photo-electric conversion element and signal processing apparatus are electrically connected; Wherein, the described exit slit of being located at described monochromator end is at least two, is equipped with described photo-electric conversion element at these at least two exit slit places, and each photo-electric conversion element all is electrically connected with described signal processing apparatus.The present invention can detect at least two kinds of elements, and detection speed is fast, and the cost of pick-up unit is low.
Description
Technical field
The present invention relates to a kind of device for fast detecting of multichannel Laser-induced Breakdown Spectroscopy.
Background technology
Heavy metal element in industrial and agricultural products or the environment is (as lead, mercury, cadmium, chromium, copper, manganese ...) having had a strong impact on the healthy of the mankind, a spot of lead, mercury, cadmium or chromium can cause acute poisoning.Medical evidence, the lead of oral 2-3 gram can cause poisoning, and 50 grams can cause death.And if trace heavy metals long-term accumulation in vivo also can cause slow poisoning, cause organ dysfunction decline and immune system disorder.So European Union's concentration of lead, chromium, cadmium and the mercury four heavy metal species elements in all electronic products has for a long time made regulation, i.e. ROHS standard, wherein plumbous, mercury of regulation and positive hexavalent chromium concentration must not surpass 1000ppm, and cadmium concentration must not surpass 100ppm.
The technological means that is used for the detection by quantitative micro heavy at present mainly contains X-ray fluorescence method, atomic absorption spectroscopy and inductively coupled plasma atomic emission spectrum technology.Wherein X-ray fluorescence method can be realized fast detecting, but its sensitivity is lower; The accuracy of detection height of atomic absorption spectroscopy and inductively coupled plasma atomic emission spectrum technology, good stability, but because apparatus expensive, sample pre-treatments is time-consuming, generally needs a couple of days, is difficult to widely apply.
The Laser-induced Breakdown Spectroscopy technology is a kind of novel spectral detection means, it is widely used in for example soil, water body, alloy, fruit and vegetable, pigment, antique historical relic etc. being carried out ultimate analysis in the fields such as environmental pollution monitoring, industrial products detection, food quality detection and archaeology analysis.It has simple fast, need not sample pretreatment, to sample damage little and wide accommodation, be convenient to advantage such as remote control, particularly its characteristics that need not sample pre-treatments have very big advantage.
The principle of Laser-induced Breakdown Spectroscopy technology: Laser-induced Breakdown Spectroscopy is as a kind of detection technique, its principle is to sample surfaces with pulse laser focusing, atom in the sample is owing to absorb photon energy and the effect of electronic atom collision, produced " puncture " effect and formed high-temperature plasma, part of atoms or ion transition are to the high-energy attitude in this process; After laser pulse finished, plasma cooled off rapidly, was in the atom of high-energy attitude or ion this moment and got back to ground state and give off characteristic spectrum owing to transition.Can carry out qualitative or quantitative test to element contained in the sample by studying this spectrum.
The atomic radiation of Laser-induced Breakdown Spectroscopy is only very faint, can't use common lens to gather through the spectrum that launches after grating or the prismatic decomposition, because its insufficient sensitivity.Gather Laser-induced Breakdown Spectroscopy at present both at home and abroad and mainly use two kinds of means: first, use hyperchannel multiplication imager to gather spectrum, so just can disposable whole spectrum be collected, realize the disposable detection of multielement, but shortcoming is a hyperchannel multiplication imager to cost an arm and a leg, and need to be equipped with relevant liquid nitrogen refrigerating system, be difficult to bear for common laboratory or production mechanism; Second, use the collection of photomultiplier single channel, this method must add a slit (promptly becoming monochromator) at the exit end of grating beam splitting spectrum, can only gather the light intensity of a wavelength at every turn, and will be detecting a plurality of elements, then need rotating shutter to change output wavelength, gather simultaneously so can't realize multielement.
Summary of the invention
The object of the present invention is to provide a kind of device for fast detecting of multichannel Laser-induced Breakdown Spectroscopy.The present invention can detect at least two kinds of elements, and detection speed is fast, and the cost of pick-up unit is low.
Technical scheme of the present invention is as follows:
A kind of device for fast detecting of multichannel Laser-induced Breakdown Spectroscopy, comprise laser instrument, sample placement position, light transmission component, monochromator and signal processing apparatus, laser instrument is placed the position towards sample, on monochromator, be provided with entrance slit and exit slit, the place is provided with photo-electric conversion element at exit slit, and photo-electric conversion element and signal processing apparatus are electrically connected; The described exit slit of being located at described monochromator end is at least two, is equipped with described photo-electric conversion element at these at least two exit slit places, and each photo-electric conversion element all is electrically connected with described signal processing apparatus.
Described photo-electric conversion element is a photomultiplier.
Be provided with convex lens between described laser instrument and described sample placement position, described light transmission component is an optical fiber.
It is two-dimentional mobile platform that described sample is placed the position, and promptly the sample mounting table can produce slight mobilely, avoids crossing and forming hole for a long time owing to laser radiation, and then influences the ejaculation of plasma.
Described color analyzer also comprises first concavees lens, second concavees lens, inverse mirror and grating, and the light of injecting from entrance slit behind catoptron, first concavees lens, grating and second concavees lens, spreads out of through described exit slit successively again.
Described signal processing apparatus comprises modulus acquisition module and computing machine, and modulus acquisition module and computing machine are electrically connected, and described two photo-electric conversion elements and modulus acquisition module are electrically connected.
Described exit slit and photomultiplier are four.
Place the position side at described sample and also be provided with photoelectric switch, this photoelectric switch and described signal processing apparatus are electrically connected.When laser instrument arrived sample with laser radiation, photoelectric switch sent a synchronizing signal for the modulus acquisition module, so that modulus acquisition module and laser instrument are synchronous.
After adopting pick-up unit of the present invention, used detection method comprises the steps:
A, laser instrument output laser planoconvex lens shine on the sample after focusing on, and outwards launch light when the sample interior element decomposes;
B, the emission light that spreads out of from sample import the entrance slit of monochromator into through optical fiber, to launch the light criterion through mirror reflects, first concavees lens successively again is directional light, directional light is focused on by second concavees lens through grating polarization again, and the light of focusing is injected respectively in four exit slits;
The light that the photo-electric conversion element at C, four exit slit places will be located respectively is converted to electric signal, simultaneously each signal is handled by signal processing apparatus again.
In sum, advantage of the present invention is: the present invention is provided with four exit slits on monochromator, the wavelength of respectively corresponding lead, chromium, cadmium and mercury four heavy metal species elements, when detecting, can disposablely carry out check and analysis to four heavy metal species elements in the sample, analysis speed greatly improves, and the cost of pick-up unit is low simultaneously.
Description of drawings
Fig. 1 is the synoptic diagram of pick-up unit of the present invention;
Fig. 2 is among Fig. 1, the partial enlarged drawing of monochromator;
Description of reference numerals:
1, laser instrument, 2, sample places the position, 3, monochromator, 4, modulus acquisition module, 5, computing machine, 6, sample, 7, convex lens, 8, first concavees lens, 9, second concavees lens, 10, catoptron, 11, grating, 12, photoelectric switch, 13, entrance slit, 14, first exit slit, 15, second exit slit, 16, the 3rd exit slit, the 17, the 4th exit slit, 18, first photomultiplier, 19, second photomultiplier, 20, the 3rd photomultiplier, the 21, the 4th photomultiplier, 22, optical fiber.
Embodiment
Extremely shown in Figure 2 as Fig. 1, a kind of device for fast detecting of multichannel Laser-induced Breakdown Spectroscopy, comprise laser instrument 1, sample placement position 2, light transmission component, monochromator 3 and signal processing apparatus, laser instrument 1 is placed position 2 towards sample, on monochromator 3, be provided with entrance slit 13 and exit slit, the place is provided with photo-electric conversion element at exit slit, and photo-electric conversion element and signal processing apparatus are electrically connected; The described exit slit of being located at described monochromator 3 ends is at least two, is equipped with described photo-electric conversion element at these at least two exit slit places, and each photo-electric conversion element all is electrically connected with described signal processing apparatus.
Wherein, described exit slit is four (first exit slit 14, second exit slit 15, the 3rd exit slit 16, the 4th exit slits 17), and it is photomultiplier (first photomultiplier 18, second photomultiplier 19, the 3rd photomultiplier 20, the 4th photomultiplier 21) that four exit slit places are provided with four photo-electric conversion elements respectively.
It is two-dimentional mobile platform that described sample is placed position 2, is provided with convex lens 7 between described laser instrument 1 and described sample placement position 2, and described light transmission component is an optical fiber 22; Described color analyzer also comprises first concavees lens 8, second concavees lens 9, inverse mirror and grating 11, and the light of injecting from entrance slit behind catoptron 10, first concavees lens 8, grating 11 and second concavees lens 9, spreads out of through four exit slits respectively successively again.Described signal processing apparatus comprises modulus acquisition module 4 and computing machine 5, and modulus acquisition module 4 is electrically connected with computing machine 5, and described two photo-electric conversion elements and modulus acquisition module 4 are electrically connected.Sample is placed position 2 sides and also is provided with photoelectric switch 12, and this photoelectric switch 12 is electrically connected with modulus acquisition module 4.
After adopting present embodiment, its detection method comprises the steps:
A, laser instrument 1 output laser planoconvex lens 7 shine on the sample 6 after focusing on, and outwards launch light when sample 6 interior elements decompose;
B, the emission light that spreads out of from sample 6 import the entrance slit of monochromator 3 into through optical fiber 22, to launch the light criterion through catoptron 10 reflections, first concavees lens 8 successively again is directional light, directional light is through grating 11 polarizations, focused on by second concavees lens 9, the light of focusing is injected respectively in four exit slits again;
The light that the photo-electric conversion element at C, four exit slit places will be located respectively is converted to electric signal, simultaneously each signal is handled by signal processing apparatus again.
In sum, the advantage of present embodiment is: be provided with four exit slits on monochromator 3, the wavelength of respectively corresponding lead, chromium, cadmium and mercury four heavy metal species elements, when detecting, can disposablely carry out check and analysis to four heavy metal species elements in the sample 6, analysis speed greatly improves, and the cost of pick-up unit is low simultaneously.
Be preferred embodiment of the present invention only below, do not limit protection scope of the present invention with this; Any replacement and the improvement done on the basis of not violating the present invention's design all belong to protection scope of the present invention.
Claims (7)
1, a kind of device for fast detecting of multichannel Laser-induced Breakdown Spectroscopy, comprise laser instrument, sample placement position, light transmission component, monochromator and signal processing apparatus, laser instrument is placed the position towards sample, on monochromator, be provided with entrance slit and exit slit, the place is provided with photo-electric conversion element at exit slit, and photo-electric conversion element and signal processing apparatus are electrically connected; It is characterized in that the described exit slit of being located at described monochromator end is at least two, be equipped with described photo-electric conversion element at these at least two exit slit places, each photo-electric conversion element all is electrically connected with described signal processing apparatus.
2, the device for fast detecting of multichannel Laser-induced Breakdown Spectroscopy according to claim 1 is characterized in that described photo-electric conversion element is a photomultiplier.
3, the device for fast detecting of multichannel Laser-induced Breakdown Spectroscopy according to claim 1 is characterized in that, places between the position at described laser instrument and described sample and is provided with convex lens, and described light transmission component is an optical fiber.
4, as the device for fast detecting of multichannel Laser-induced Breakdown Spectroscopy as described in each in the claim 1 to 3, it is characterized in that it is two-dimentional mobile platform that described sample is placed the position.
5, as the device for fast detecting of multichannel Laser-induced Breakdown Spectroscopy as described in each in the claim 1 to 3, it is characterized in that, described color analyzer also comprises first concavees lens, second concavees lens, inverse mirror and grating, the light of injecting from entrance slit behind catoptron, first concavees lens, grating and second concavees lens, spreads out of through described exit slit respectively successively again.
6, as the device for fast detecting of multichannel Laser-induced Breakdown Spectroscopy as described in each in the claim 1 to 3, it is characterized in that, described signal processing apparatus comprises modulus acquisition module and computing machine, modulus acquisition module and computing machine are electrically connected, and described two photo-electric conversion elements and modulus acquisition module are electrically connected.
7, as the device for fast detecting of multichannel Laser-induced Breakdown Spectroscopy as described in each in the claim 1 to 3, it is characterized in that described exit slit and photomultiplier are four.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102128815A (en) * | 2010-11-26 | 2011-07-20 | 清华大学 | Detection time and position controllable laser induced breakdown spectroscopy detection device |
| CN102661935A (en) * | 2012-05-15 | 2012-09-12 | 广东电网公司电力科学研究院 | LIBS (Laser-induced Breakdown Spectroscopy) belt type powdery material detector |
| CN104458687A (en) * | 2014-12-10 | 2015-03-25 | 安徽理工大学 | Device and method for identifying mine shaft water invasion resource based on laser induction and SIMCA classification method |
| CN104515754A (en) * | 2014-11-14 | 2015-04-15 | 中国科学院上海光学精密机械研究所 | Laser plasma spectrometry device |
| CN105527274A (en) * | 2016-01-29 | 2016-04-27 | 华中科技大学 | Efficient multipath laser probe analysis system and method |
| CN106725309A (en) * | 2016-11-29 | 2017-05-31 | 中国科学院长春光学精密机械与物理研究所 | High speed frequency-sweeping laser source sweep characteristic verifies device |
| CN108020540A (en) * | 2017-12-11 | 2018-05-11 | 中国科学院光电研究院 | A kind of laser induced breakdown spectroscopy detecting system |
| CN111912832A (en) * | 2020-07-03 | 2020-11-10 | 苏州星帆华镭光电科技有限公司 | Adjustable photoelectric double-pulse laser-induced breakdown spectrometer |
-
2009
- 2009-07-03 CN CNA2009100408147A patent/CN101592609A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102128815A (en) * | 2010-11-26 | 2011-07-20 | 清华大学 | Detection time and position controllable laser induced breakdown spectroscopy detection device |
| CN102128815B (en) * | 2010-11-26 | 2012-11-14 | 清华大学 | Detection time and position controllable laser induced breakdown spectroscopy detection device |
| CN102661935A (en) * | 2012-05-15 | 2012-09-12 | 广东电网公司电力科学研究院 | LIBS (Laser-induced Breakdown Spectroscopy) belt type powdery material detector |
| CN104515754A (en) * | 2014-11-14 | 2015-04-15 | 中国科学院上海光学精密机械研究所 | Laser plasma spectrometry device |
| CN104515754B (en) * | 2014-11-14 | 2018-03-06 | 中国科学院上海光学精密机械研究所 | Laser plasma spectrometry device |
| CN104458687A (en) * | 2014-12-10 | 2015-03-25 | 安徽理工大学 | Device and method for identifying mine shaft water invasion resource based on laser induction and SIMCA classification method |
| CN105527274A (en) * | 2016-01-29 | 2016-04-27 | 华中科技大学 | Efficient multipath laser probe analysis system and method |
| CN105527274B (en) * | 2016-01-29 | 2018-01-02 | 华中科技大学 | A kind of efficient multi-path laser probe analysis System and method for |
| CN106725309A (en) * | 2016-11-29 | 2017-05-31 | 中国科学院长春光学精密机械与物理研究所 | High speed frequency-sweeping laser source sweep characteristic verifies device |
| CN108020540A (en) * | 2017-12-11 | 2018-05-11 | 中国科学院光电研究院 | A kind of laser induced breakdown spectroscopy detecting system |
| CN108020540B (en) * | 2017-12-11 | 2020-10-20 | 中国科学院光电研究院 | Laser-induced breakdown spectroscopy detection system |
| CN111912832A (en) * | 2020-07-03 | 2020-11-10 | 苏州星帆华镭光电科技有限公司 | Adjustable photoelectric double-pulse laser-induced breakdown spectrometer |
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