CN103278480B - Laser-induced breakdown spectroscopy-based hand-held solid waste heavy metal detection probe - Google Patents
Laser-induced breakdown spectroscopy-based hand-held solid waste heavy metal detection probe Download PDFInfo
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- CN103278480B CN103278480B CN201310151495.3A CN201310151495A CN103278480B CN 103278480 B CN103278480 B CN 103278480B CN 201310151495 A CN201310151495 A CN 201310151495A CN 103278480 B CN103278480 B CN 103278480B
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Abstract
The invention discloses a laser-induced breakdown spectroscopy-based hand-held solid waste heavy metal detection probe. The laser-induced breakdown spectroscopy-based hand-held solid waste heavy metal detection probe comprises a housing. A right end of the housing is provided with a laser emission head. A convergent lens and an off-axis parabolic mirror are orderly arranged in a left light path of the laser emission head. The housing at the left side of the convergent lens is provided with a gap. A sample needing to be detected is arranged rightly at the left side of the gap. A plane mirror and a dialyte lens assembly are orderly arranged under the off-axis parabolic mirror. The off-axis parabolic mirror and the plane mirror are coated with broadband dielectric films. The housing under the dialyte lens assembly is provided with an optical fiber end. A doublet and ground glass are orderly arranged at the right side of the plane mirror. The laser-induced breakdown spectroscopy-based hand-held solid waste heavy metal detection probe can detect a detection point which is more than 400mm away from the probe, can avoid direct contact with the solid waste, can protect system and operator safety, has a high integrated level, a small volume and light weight, is in a shape of a pistol, is convenient for operation and carrying, has a low cost and can be realized easily.
Description
Technical field
The present invention relates to environmental optics detection technique field, particularly relate to a kind of based on Laser-induced Breakdown Spectroscopy hand-held solid waste heavy metal detection probe.
Background technology
At present, LIBS has been widely used in each association area.It has also been obtained certain application in the detection of industrial discharge solid waste heavy metal.But, the existing detection of the industrial solid castoff heavy metal based on Laser-induced Breakdown Spectroscopy is still based on spot sampling, laboratory analysis methodologies, no matter its optical system, institute's employing spectrometer or computer control system, volume is all comparatively large and heavy, can only fetch discarded object sample from scene and could be used for detection after processing.Small and exquisite, the light industrial solid castoff heavy metal detection system can carrying out on-the-spot in-situ investigation is at present also little.Even if there is the optic probe based on Laser-induced Breakdown Spectroscopy, but mostly require that probe directly contacts with sample when these probes use, inevitably make system or even operator be subject to the pollution of discarded object.Therefore, these probes are not suitable for the in-situ measurement of solid waste heavy metal yet.Along with industrial development, trade waste quantity increases day by day.Especially the industrial discharge amount such as metallurgy, thermal power generation is maximum.Trade waste substantial amounts, of a great variety, complicated component, process is difficulty quite.Trade waste passiveness is stored up and is not only taken a large amount of soil, causes the waste of manpower and materials, and many industrial residues contain material soluble in water, by leaching may contaminated soil, water body, biosome to such an extent as to threaten the health of mankind itself.Thus for the consideration to industrial solid castoff process, must understand kind and the content of heavy metal in industrial solid castoff, this is by the process that is conducive to industrial solid castoff and recycling.
Summary of the invention
The object of the invention is exactly the defect in order to make up prior art, provides a kind of based on Laser-induced Breakdown Spectroscopy hand-held solid waste heavy metal detection probe.
The present invention is achieved by the following technical solutions:
A kind of based on Laser-induced Breakdown Spectroscopy hand-held solid waste heavy metal detection probe, include housing, at the right-hand member of housing, laser instrument emitting head is installed, the left side light path of laser instrument emitting head is disposed with convergent lens and off axis paraboloidal mirror, the housing on the convergent lens left side has breach, 400mm place, the breach left side is provided with testing sample, level crossing and dialyte lens group is disposed with immediately below off axis paraboloidal mirror, described off axis paraboloidal mirror and level crossing are all coated with broadband medium film, immediately below dialyte lens group, housing is provided with optic fibre end, cemented doublet and frosted glass is disposed with on the right side of described level crossing, the off axis paraboloidal mirror described in visible ray directive that tested point on testing sample sends, visible ray by off axis paraboloidal mirror turnover and collimated incident on described level crossing, visible ray by flat mirror reflects on described cemented doublet, be imaged onto on described frosted glass by cemented doublet, pulse laser is sent by laser instrument emitting head, pulse laser coalescence can be applied to testing sample surface by convergent lens, testing sample is excited into plasma and launches plasma spectrometry, plasma spectrometry is transferred by off axis paraboloidal mirror and is collimated, incide in described dialyte lens group through described level crossing, coalescence described optic fibre end can be coupled into by dialyte lens group.
Described convergent lens optical material is K9; The optical material of described dialyte lens group is FK51; The optical material of the two panels lens of described cemented doublet is respectively K9 and ZF2.
The core diameter of described optic fibre end is 1mm, and make plasma light spectrum signal all can be coupled into optical fiber, signal coupling efficiency is high.
Advantage of the present invention is: the tested point that the present invention adjusts the distance beyond its 400mm detects, avoid probe to contact with the direct of solid waste, simultaneously because tested point is distant, the sputtering that also prevent sample surfaces during detection, to the pollution of probe, protects the safety of system and operator; In optic probe introduce aim at light path, by balsaming lens group, tested point is imaged onto on frosted glass, when pop one's head in solid waste at a distance of 400mm, assist operator tested point is aimed at, ensure that the degree of accuracy of detection; Integrated level is high, volume is little, lightweight, outer likeness in form pistol, is convenient for carrying and operates, and cost low, be easy to realize.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is that the light signal of plasma emission is turned back through off axis paraboloidal mirror, collimated, then the point range figure at optic fibre end place after dialyte lens group is assembled.
Fig. 3 is the modulated optical transfer curve of different visual fields object point meridional beam and sagittal beam.
Fig. 4 is (being respectively 10CY/MM, 20CY/MM, 30CY/MM) under three kinds of different spaces line densities, and modulated optical transfer function values is about the curve of visual field.
Embodiment
As shown in Figure 1, a kind of based on Laser-induced Breakdown Spectroscopy hand-held solid waste heavy metal detection probe, include housing 10, at the right-hand member of housing 10, laser instrument emitting head 1 is installed, the left side light path of laser instrument emitting head 1 is disposed with convergent lens 2 and off axis paraboloidal mirror 3, the housing 10 on convergent lens 2 left side has breach 11, 400mm place, breach 11 left side is provided with testing sample 4, level crossing 5 and dialyte lens group 7 is disposed with immediately below off axis paraboloidal mirror 3, described off axis paraboloidal mirror 3 and level crossing 5 are all coated with broadband medium film, immediately below dialyte lens group 7, housing 10 is provided with optic fibre end 9, cemented doublet 6 and frosted glass 8 is disposed with on the right side of described level crossing 5, the off axis paraboloidal mirror 3 described in visible ray directive that tested point on testing sample 4 sends, visible ray by off axis paraboloidal mirror 3 transfer and collimated incident on described level crossing 5, visible ray reflexes on described cemented doublet 6 by level crossing 5, be imaged onto on described frosted glass 8 by cemented doublet 6, pulse laser is sent by laser instrument emitting head 1, pulse laser coalescence can be applied to testing sample surface by convergent lens 2, testing sample is excited into plasma and launches plasma spectrometry, plasma spectrometry is transferred by off axis paraboloidal mirror 3 and is collimated, incide in described dialyte lens group 7 through described level crossing 5, coalescence described optic fibre end 9 can be coupled into by dialyte lens group 7.
Described convergent lens 2 optical material is K9; The optical material of described dialyte lens group 7 is FK51; The optical material of the two panels lens of described cemented doublet 6 is respectively K9 and ZF2.
The core diameter of described optic fibre end 9 is 1mm, and make plasma light spectrum signal all can be coupled into optical fiber, signal coupling efficiency is high.
Solid waste heavy metal Laser-induced Breakdown Spectroscopy characteristic spectral line is generally between 300 ~ 500nm.Off axis paraboloidal mirror 3 is coated with broadband medium film, and it has high reflectance within the scope of 300 ~ 800nm, and to laser incident wavelength, namely 1064nm place has high permeability; Plane level crossing 5 is coated with broadband medium film, it has high permeability within the scope of 300 ~ 500nm, has high reflectance within the scope of 500 ~ 800nm; Miniature laser emitting head 1 is long is less than 11cm, is widely less than 3cm, and higher primary school is in 4cm, and weight is less than 100 grams; Convergent lens 2 optical material is K9; The optical material of dialyte lens group 7 is FK51; The two panels lens of cemented doublet 6 are respectively K9 and ZF2.Probe carries out heavy metal detection to the sample outside 400mm.The pulse laser that laser instrument emitting head 1 is launched by convergent lens 2 coalescence can be applied to testing sample surface, testing sample is excited into plasma, and launches plasma spectrometry; Plasma light spectrum signal is also highly collimated by turnover by off axis paraboloidal mirror 3, through level crossing 5, coalescence can be coupled into optic fibre end 9 by dialyte lens group 7; The core diameter adopting optic fibre end 9 is 1mm, and numerical aperture is 0.24; The visible ray that on testing sample 4, tested point sends is transferred by off axis paraboloidal mirror 3 and is highly collimated, then is transferred by level crossing 5, is imaged onto on frosted glass 8 finally by cemented doublet 6.The light beam numerical aperture that sample tested point incides off axis paraboloidal mirror 3 place is 0.1, and the aperture of cemented doublet 6 and dialyte lens group 7 is 40mm, ensure that the plasma signal illuminance at visible light illumination and optic fibre end 9 place on frosted glass 8 respectively.Operator is before detection, and first selected tested point, then aims at tested point, when observer see on frosted glass 8 tested point clearly as time, namely whole system aims at tested point.Now, tested point distance probe 400mm, and be positioned on the optical axis of transmitting light path, plasma signal light collection light path and tested point aiming light path, operator can detect this point.Plasma signal light is after off axis paraboloidal mirror 3 and dialyte lens group 7, and its light beam numerical aperture is 0.22, is less than the numerical aperture 0.24 selecting optical fiber, and the spot diameter at optic fibre end 9 place is less than 1mm, as shown in Figure 2.Off axis paraboloidal mirror 3, the aiming light path that level crossing 5 and cemented doublet 6 form is visual system, because eyes observe frosted glass 8 outward at distance of distinct vision 250mm, determine that the spatial margins resolution of this visual system is 13.7lp/mm, the modulated optical transport function of this system is as Fig. 3, shown in 4, Fig. 3 is the modulated optical transfer curve of different visual fields object point meridional beam and sagittal beam, horizontal ordinate is space line density, ordinate is modulated optical transfer function values, Fig. 4 (is respectively 10CY/MM under three kinds of different spaces line densities, 20CY/MM, 30CY/MM), modulated optical transfer function values is about the curve of visual field, horizontal ordinate is field angle, ordinate is modulated optical transfer function values, each wavelength and each visual field are all greater than the modulated optical transport function threshold value of visual system in the modulated optical transfer function values at 13.7lp/mm place, namely 0.05.
Claims (3)
1. pop one's head in based on the detection of Laser-induced Breakdown Spectroscopy hand-held solid waste heavy metal for one kind, include housing, at the right-hand member of housing, laser instrument emitting head is installed, the left side light path of laser instrument emitting head is disposed with convergent lens and off axis paraboloidal mirror, the housing on the convergent lens left side has breach, it is characterized in that: 400mm place, the breach left side is provided with testing sample, level crossing and dialyte lens group is disposed with immediately below off axis paraboloidal mirror, described off axis paraboloidal mirror and level crossing are all coated with broadband medium film, immediately below dialyte lens group, housing is provided with optic fibre end, cemented doublet and frosted glass is disposed with on the right side of described level crossing, the off axis paraboloidal mirror described in visible ray directive that tested point on testing sample sends, visible ray by off axis paraboloidal mirror turnover and collimated incident on described level crossing, visible ray by flat mirror reflects on described cemented doublet, be imaged onto on described frosted glass by cemented doublet, pulse laser is sent by laser instrument emitting head, pulse laser coalescence can be applied to testing sample surface by convergent lens, testing sample is excited into plasma and launches plasma spectrometry, plasma spectrometry is transferred by off axis paraboloidal mirror and is collimated, incide in described dialyte lens group through described level crossing, coalescence described optic fibre end can be coupled into by dialyte lens group.
2. according to claim 1 based on Laser-induced Breakdown Spectroscopy hand-held solid waste heavy metal detection probe, it is characterized in that: described convergent lens optical material is K9; The optical material of described dialyte lens group is FK51; The optical material of the two panels lens of described cemented doublet is respectively K9 and ZF2.
3. according to claim 1 based on Laser-induced Breakdown Spectroscopy hand-held solid waste heavy metal detection probe, it is characterized in that: the core diameter of described optic fibre end is 1mm.
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| CN103558191B (en) * | 2013-09-27 | 2016-02-17 | 武汉新瑞达激光工程有限责任公司 | A kind of portable laser probe analytical instrument |
| CN104535544B (en) * | 2014-12-29 | 2018-01-16 | 中国科学院合肥物质科学研究院 | A kind of device that heavy metal-polluted soil is detected using LIBS |
| CN105675587B (en) * | 2016-03-12 | 2019-04-16 | 西安交通大学 | Electrical equipment online supervision method and device based on laser induced breakdown spectroscopy |
| NL2017769B1 (en) * | 2016-11-11 | 2018-05-24 | Scrapscanner B V | Process and apparatus for scrap metal scanning |
| CN108088813B (en) * | 2017-12-08 | 2021-06-18 | 中国科学院上海应用物理研究所 | On-line detection device for metal elements in molten salt |
| CN108459012A (en) * | 2017-12-28 | 2018-08-28 | 中国科学院合肥物质科学研究院 | Portable laser plasma spark electric discharge component spectrum detecting system |
| CN108931480A (en) * | 2018-08-16 | 2018-12-04 | 中国科学院沈阳自动化研究所 | A kind of Portable element ingredient device for fast detecting and its method |
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| CN103210303A (en) * | 2010-10-01 | 2013-07-17 | 技术信息有限公司 | Laser induced breakdown spectroscopy analyser |
| US8902422B2 (en) * | 2011-10-21 | 2014-12-02 | Chesner Engineering, Pc | Bulk material sampling and laser targeting system |
| CN102901717B (en) * | 2012-06-12 | 2014-10-29 | 中国科学院安徽光学精密机械研究所 | Laser-induced breakdown spectroscopy-based portable handheld soil heavy mental detection device |
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