CN106442471A - Remote measuring device based on LIBS (laser-induced breakdown spectroscopy) technology - Google Patents
Remote measuring device based on LIBS (laser-induced breakdown spectroscopy) technology Download PDFInfo
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- CN106442471A CN106442471A CN201610962919.8A CN201610962919A CN106442471A CN 106442471 A CN106442471 A CN 106442471A CN 201610962919 A CN201610962919 A CN 201610962919A CN 106442471 A CN106442471 A CN 106442471A
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- laser
- remote measuring
- photocell
- spectrogrph
- measuring device
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- 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
-
- 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
- G01N2201/061—Sources
- G01N2201/06113—Coherent sources; lasers
Abstract
The invention discloses a remote measuring device based on an LIBS (laser-induced breakdown spectroscopy) technology. The remote measuring device comprises a probe module, a collection module, an external triggering detection module and a computer. The invention aims at providing a remote measuring device which is based on the LIBS technology, can carry out outdoor online in-situ detection and can guarantee safe measurement of a tester when the tester can not carry out operation by adopting an instrument and a device directly or in close range in some specific environments such as high-temperature high-pressure environments in the chemical field, a radioactive substance containing test environment and space exploration. Besides, due to unique optical path design of the remote measuring device disclosed by the invention, the remote measuring device is small in size, compact in structure and light in weight, and the whole device can be integrated into a suitcase and carried to the outdoor space by a car for detection.
Description
Technical field
The present invention relates to technical field of optical instrument, more particularly to a kind of remote measuring unit based on LIBS technology.
Background technology
LIBS (Laser Induced Breakdown Spectroscopy, abbreviation LIBS),
It is a kind of New type atom spectral analysis technique, testing sample is directly excited into plasma using aggregation intense pulse laser by it,
The elementary analysiss of sample are realized by spectral signal in analysis plasma.The technical operation is simple, and measuring speed is fast, measurement
Scope is wide, determines ability with multiphase, can complete the qualitative and quantitative analysis of element contained by complex material.Due to above-mentioned
Advantage, LIBS is widely applied to the fields such as metallurgical analysis, environmental monitoring, geological prospecting, on-line monitoring, national defence.
In traditional sense, during LIBS technology application, in-plant test and analysis directly can be carried out to testing sample,
But under some specific fields and environment, such as the high temperature and high pressure environment of chemical field, containing radioactive substance test environment and
Space exploration etc., tester directly or closely cannot carry out operation using instrument and device.
Content of the invention
The present invention is intended to provide a kind of remote measuring unit based on LIBS technology, can carry out outdoor online in-situ investigation,
Under some specific environment, such as the high temperature and high pressure environment of chemical field, containing radioactive substance test environment and space exploration
Deng, when tester directly or closely cannot carry out operation using instrument and device, ensure that tester's security measurement.
For reaching above-mentioned purpose, the technical solution used in the present invention is as follows：
A kind of remote measuring unit based on LIBS technology, including probe module, collection module, external trigger detection module,
Refrigeration module, dedusting module and computer；
The probe module includes laser instrument and laser beam expanding system, and the laser beam expanding system includes sequentially coaxially to arrange
Concavees lens, convex lenss and condenser lenses；The laser head of the laser instrument just to concavees lens, the concavees lens be located at laser head and
Between convex lenss；
The collection module includes concave mirror and fibre-optical probe, and fibre-optical probe is located at the focal point of concave mirror；
The external trigger detection module includes photocell, chronotron and spectrogrph；The photocell electrically connected with chronotron,
Chronotron is electrically connected with spectrogrph, and chronotron receives photocell signal the work of Time-delayed trigger spectrogrph；The fibre-optical probe leads to
Cross optical fiber connection spectrogrph；
The laser instrument, chronotron and spectrogrph respectively with calculate mechatronics.
Preferably, the concave mirror is in same perpendicular with laser instrument.
Preferably, the photocell is arranged on laser instrument side edge.
Preferably, the chronotron is connected with computer by universal serial bus.
Preferably, the photocell is in 30 ° of angles with laser instrument.
The laser entrance of the laser head alignment laser beam expanding system of the laser instrument, its axis and concavees lens, convex lenss and
The dead in line of condenser lenses three.Pulse laser launched by laser instrument, and pulse laser first passes through the effect of expanding, and completes to expand
Pulse laser reaches focus lamp (focal length is 5m), and pulse laser is focused on to be measured after focus lamp at 5m in front of focus lamp
The surface of sample, focuses on laser and testing sample matter interaction, and excites testing sample to produce plasma, plasma
Signal will be in spatial diffusion in sample surfaces after producing.
The laser beam expanding system is made up of concavees lens, convex lenss and condenser lenses.Laser instrument is got
Laser reach beam-expanding system front end concavees lens, original incident laser through concavees lens act on, in divergent shape continue propagate；Through one
After fixed distance, the beam-expanding system output convex lenss at concavees lens rear are reached, and convex lenss will receive the laser light of divergent shape herein
Restraint and change laser path, be in flat shape propagation after making laser beam planoconvex lens.Light beam continues to propagate arrival condenser lenses, warp
The focussing force of condenser lenses, laser beam will form a higher hot spot of power density at the 5m of focus lamp rear, and then
Effectively act on testing sample, the stronger plasma of signal is formed, is collected via collection system plasma signal
Analysis, and it is finally reached the purpose of analysis testing sample constituent.
The collection module is Newtonian reflector system, including concave mirror and fibre-optical probe.
The workflow of the concave mirror is：Testing sample outside certain distance by with laser action produce etc. from
Daughter, plasma signal will in irregular status space divergence, as testing sample has certain distance with concave mirror,
When plasma signal reaches concave mirror position approximately in parastate incidence；Reach after plasma signal incidence and receive
At concave mirror in collecting system, signal reflects via concave mirror and focuses on, and focal point places fibre-optical probe, signal warp
Crossing the coupling of probe and spectrogrph is conveyed into via optical fiber.
The fibre-optical probe is placed in the focal point that signal reflects via concave mirror and focuses on, by signal couple and via
Optical fiber is conveyed into spectrogrph.
The photocell is placed in laser instrument side edge at an angle, and photocell is in 30 ° of angles with laser instrument so that
Photocell preferably receives scattered light.After pulse laser is sent by laser instrument, laser instrument will be inevitably to laser beam week
Enclose and launch scattered light, now scattered light is reached at preassembled photocell, triggering photocell is worked, photocell is received and dissipated
Penetrate light and the signal of scattered light is converted into the signal of telecommunication and then transmits a signal to pulse delay unit.
The chronotron receives signal from photocell to trigger spectrogrph work, delay time can by serial ports come
Arrange.
The Working mode set of the spectrogrph is external trigger mode, and the spectral line signal that reception optical fiber transmission comes, by signal
By wavelength order arrangement form spectrum, and result is detected and recorded.
The present invention has advantages below：
1st, the light path design of present invention uniqueness so that device volume is little, compact conformation, light weight, and whole device can be integrated
To inside a suitcase, vehicle-mounted detected to open air.
2nd, the laser beam expanding system that the present invention is adopted can change laser path, be in parallel after making laser beam planoconvex lens
Shape is propagated, and can effectively reduce the initial angle of divergence of laser, improves the collimating effect of pulsed laser beam.
3rd, the present invention can be used for the high-temperature high dust environment of chemical industry, iron and steel domain, and tester cannot directly or closely
The dangerous situation of operation is carried out using instrument and device, it is ensured that the safety of tester.
4th, the present invention has batch sample power of test, can carry out high-volume Multi-example test.
5th, the present invention has Multiphasic analysis ability, and solid, liquid, gas, particle can all be detected.
6th, test scope of the present invention is wide, can determine all elements on the periodic table of elements.
7th, the present invention has sample source judgement, by contrasting with data base, can carry out classification to sample source and sentence
Disconnected.
8th, test speed of the present invention is fast, the qualitative and quantitative analysis that can just complete sample element in tens seconds；The present invention is grasped
Make simple, it is not necessary to which pretreatment is carried out to sample.
Description of the drawings
Fig. 1 is schematic structural view of the invention；
Fig. 2 is laser beam expanding schematic diagram；
Fig. 3 newton reflecting and collecting system schematic；
Fig. 4 is external trigger system schematic；
Fig. 5 is analysis spectrogram of the present invention to Thassos sample；
Fig. 6 is analysis spectrogram of the present invention to ceramics sample；
Fig. 7 is method of the present invention flow chart；
In figure：1- laser instrument, 2- concavees lens, 3- convex lenss, 4- condenser lenses, 5- concave mirror, 6- fibre-optical probe, 7-
Photocell, 8- chronotron, 9- spectrogrph, 10- computer.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with accompanying drawing, the present invention is entered
Row is further described.
As shown in figure 1, a kind of remote measuring unit based on LIBS technology, including probe module, collection module, external trigger
Detection module and computer 10；The probe module includes laser instrument 1 and laser beam expanding system, and the laser beam expanding system includes
Concavees lens 2, convex lenss 3 and the condenser lenses 4 for sequentially coaxially arranging；The laser head of the laser instrument 1 is just to concavees lens 2, described
Concavees lens 2 are Wei Yu laser head 1 and convex lenss 3 between；The collection module includes concave mirror 5 and fibre-optical probe 6, and optical fiber is visited
6 focal point for being located at concave mirror 5；The external trigger detection module includes photocell 7, chronotron 8 and spectrogrph 9；Institute
State that photocell 7 is electrically connected with chronotron 8, chronotron 8 is electrically connected with spectrogrph 9, chronotron 8 receives 7 signal of photocell time delay
Triggering spectrogrph 9 works；The fibre-optical probe 6 connects spectrogrph 9 by optical fiber；The laser instrument 1, chronotron 8 and spectrogrph 9
Respectively with calculating mechatronics.The concave mirror 5 is in same perpendicular with laser instrument 1.The photocell 7 is arranged on
1 side edge of laser instrument.The chronotron 8 is connected with computer 10 by universal serial bus.The photocell 7 is in 30 ° with laser instrument 1
Angle.
As shown in Fig. 2 pulse laser launched by laser instrument 1, pulse laser is passed through by concavees lens 2, convex lenss 3 and is focused on saturating
The laser beam expanding system constituted by mirror 4, laser is dissipated by concavees lens 2, reaches convex lenss 3, and convex lenss 3 effectively can adjust sharp
The angle of divergence of light light beam so that the collimation that the laser beam with certain angle of divergence is approximately changed into collimated light beam to improve light beam is imitated
Really, and then laser beam is caused by after condenser lenses 4, forming a higher hot spot of power density, in condenser lenses 4
Testing sample is placed at the 5m of front, laser and testing sample matter interaction is focused on, and excites testing sample to produce plasma
Body, plasma signal will be in sample surfaces in spatial diffusion after producing.Place by recessed in same perpendicular with laser instrument 1
The newton reflecting and collecting system constituted by face reflecting mirror 5 and fibre-optical probe 6,
As shown in figure 3, as testing sample has certain distance with newton reflecting and collecting system, when plasma signal is arrived
Approximately enter to inject newton reflex system in parastate when reaching collection system position, its signal path approximate as in figure solid line with
Shown in dotted line；Reach after plasma signal incidence at the concave mirror 5 in collection system, signal is via concave mirror 5
Reflecting and focusing on, focal point places fibre-optical probe 6, signal passes through the coupling of probe and spectrogrph 9 is conveyed into via optical fiber.
As shown in figure 4, photocell 7 is placed in 1 side edge of laser instrument at an angle, after pulse laser sends,
Laser instrument 1 is inevitably launched scattered light to around laser beam, and now scattered light reaches preassembled photocell 7
Place, triggering photocell 7 is worked, and photocell 7 receives scattered light and the signal of scattered light is converted into the signal of telecommunication further by signal
It is sent at pulse delay unit 8, final signal triggers spectrogrph 9 through chronotron 8 and works.Finally, present on computer 10 remote
Apart from the spectrum spectrogram of outer testing sample, by spectral line and intensity and element and the corresponding relation of content, can from which further follow that and treat
Test sample product become to be grouped into and specific constituent content information etc..
Using the remote measuring method of the present invention, comprise the following steps：
Step 01：Transmitting laser；Laser beam is launched using computer controlled laser；
Step 02：Expand focusing；The laser beam is carried out expanding focusing, the laser beam is expanded by laser
Beam system carries out expanding focusing, and the laser beam expanding system includes concavees lens, convex lenss and condenser lenses；
Step 03：Excitation signal；The laser beam after focusing on will be expanded interact with testing sample, excite testing sample
Produce plasma signal；
Step 04：Collect signal；Using newton reflecting and collecting system, the plasma signal is collected converging；
Step 05：Signal is coupled；Plasma signal is coupled as spectral line signal, the plasma signal passes through optical fiber
The coupling of probe is simultaneously conveyed into spectrogrph via optical fiber；
Step 06：Detection and analysis；Spectral line signal is pressed wavelength order arrangement form spectrum, and result is detected and remembered
Record.
It is test object with ceramics sample to choose Thassos respectively, and the qualitative ability of the present invention is tested.Fig. 5 is for making
Carried out what qualitative analyses were obtained with built to Thassos sample based on the long-range LIBS probe measurement device under hot environment
Spectrogram, Fig. 6 is to carry out qualitative analyses based on the long-range LIBS probe measurement device under hot environment to ceramics sample to obtain
Spectrogram.
The Measurement results of sample, not only can verify built LIBS long-range survey system qualitative analyses ability,
Can also be that the application that future, LIBS was remotely measured provides certain basis.
Certainly, the present invention can also have other various embodiments, in the case of without departing substantially from present invention spirit and its essence, ripe
Know those skilled in the art to make various corresponding changes according to the present invention and deform, but these corresponding changes and deformation
The protection domain of appended claims of the invention should all be belonged to.
Claims (5)
1. a kind of remote measuring unit based on LIBS technology, it is characterised in that：Including probe module, collection module, external trigger
Detection module and computer；
The probe module includes laser instrument and laser beam expanding system, and it is recessed that the laser beam expanding system includes sequentially coaxially to arrange
Lens, convex lenss and condenser lenses；The laser head of the laser instrument is just to concavees lens, and the concavees lens are located at laser head and convex lens
Between mirror；
The collection module includes concave mirror and fibre-optical probe, and fibre-optical probe is located at the focal point of concave mirror；
The external trigger detection module includes photocell, chronotron and spectrogrph；The photocell is electrically connected with chronotron, time delay
Device is electrically connected with spectrogrph, and chronotron receives photocell signal the work of Time-delayed trigger spectrogrph；The fibre-optical probe passes through light
Fine connection spectrogrph；
The laser instrument, chronotron and spectrogrph respectively with calculate mechatronics.
2. a kind of remote measuring unit based on LIBS technology according to claim 1, it is characterised in that：The concave surface is anti-
Mirror is penetrated with laser instrument in same perpendicular.
3. a kind of remote measuring unit based on LIBS technology according to claim 1, it is characterised in that：The photocell
Installed in laser instrument side edge.
4. a kind of remote measuring unit based on LIBS technology according to claim 1, it is characterised in that：The chronotron
It is connected with computer by universal serial bus.
5. a kind of remote measuring unit based on LIBS technology according to claim 3, it is characterised in that：The photocell
It is in 30 ° of angles with laser instrument.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610962919.8A CN106442471A (en) | 2016-10-28 | 2016-10-28 | Remote measuring device based on LIBS (laser-induced breakdown spectroscopy) technology |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610962919.8A CN106442471A (en) | 2016-10-28 | 2016-10-28 | Remote measuring device based on LIBS (laser-induced breakdown spectroscopy) technology |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020173048A1 (en) * | 2019-02-26 | 2020-09-03 | 扬州市管件厂有限公司 | Laser spectrum analysis apparatus and method for fluid |
| CN117462243A (en) * | 2023-12-27 | 2024-01-30 | 中日友好医院(中日友好临床医学研究所) | Laser ablation probe |
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| WO2020173048A1 (en) * | 2019-02-26 | 2020-09-03 | 扬州市管件厂有限公司 | Laser spectrum analysis apparatus and method for fluid |
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