CN1908626A - Laser inductive dissociation spectrum detection system for space environment simulation and detection method thereof - Google Patents
Laser inductive dissociation spectrum detection system for space environment simulation and detection method thereof Download PDFInfo
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- CN1908626A CN1908626A CN 200610030143 CN200610030143A CN1908626A CN 1908626 A CN1908626 A CN 1908626A CN 200610030143 CN200610030143 CN 200610030143 CN 200610030143 A CN200610030143 A CN 200610030143A CN 1908626 A CN1908626 A CN 1908626A
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Abstract
The disclosed laser induced dissociation optical spectrum detection system comprises: a pulse laser, a focus lens, a spectrograph, a pulse delay generator, a computer, and a vacuum sample room. This invention recognizes element type by comparing acquired unknown sample atomic spectrum data and normal data, and reduces the error to zero in principle.
Description
Technical field
The present invention relates to laser induced dissociation spectrographic detection technology, specifically be meant a kind of laser induced dissociation spectrum investigating system and detection method with simulated space condition.
Background technology
Material element composition Detection Techniques, that grow up more earlier is X ray Detection Techniques (XRF), it then is laser induced dissociation spectrographic detection technology (LIBS), LIBS is based on the combination of laser technology and spectral technique, it is a kind of novel material element detection analysis technology, its working mechanism is: the high energy pulse laser beam sees through convergent lens and converges at material surface, makes the micro substance gasification at convergent point place, the plasma that ionization forms High Temperature High Pressure in the short time at the utmost point; The particle that is excited to high-energy state in the plasma gives off plasma spectrometry in decay process, these spectral lines are collected through high-resolution spectral instrument analysis just can extract atoms of elements spectral line and ion line; Various elements all have standard atomic spectral line and the ion line corresponding with it, just can determine the kind of element by the wavelength of analyzing atomic spectral line and ion line, the content that the relative intensity by analysis spectral line can the inverting element.LIBS compares maximum advantage with XRF be the quick detection ability, and XRF needs long integral time usually, and LIBS just can realize repeatedly surveying usually in 1 second.
XRF is the first-selected instrument that the American is used for martian surface resource distribution exploration always, yet from the nineties in 20th century U.S.'s related experiment chamber LIBS be applied to the survey of deep space field show great interest, this reason wherein is, compare with XRF, the laser induced dissociation spectral technique shows very strong detection advantage in the survey of deep space field, be in particular in: the remote sensing ability makes the laser induced dissociation spectrometer to survey the zone that lander can't arrive; The automatically cleaning ability makes the laser induced dissociation spectrometer to be deep into to carry out below the celestial body mantle of rock internal resource to be surveyed; Compare with the integral time that XRF is long, the laser induced dissociation spectrographic detection can be realized the quick detection less than 1 second, has increased valid data the return amount of lander in the limited working time greatly.
Laser induced dissociation spectrographic detection technology has very strong detection advantage in the survey of deep space field, but the detection condition around the target, especially air pressure conditions is bigger to the influence of laser induced dissociation process, therefore set up the deep space simulated environment, the feasibility that is applied to survey of deep space with checking laser induced dissociation spectral technique is very important.
In addition, in the LIBS detection method, normally obtain the wavelength value of sample spectral line peak point correspondence earlier at present, utilize the data in this wavelength value and " the standard atomic spectra database " to contrast, realize element identification.Because there is inevitably " wavelength accuracy " problem in alignment CCD grating spectrograph, there is certain error between line wavelength value that analysis of spectrum directly reads and the real wavelength value, when the data in utilizing this wavelength value that has error and " standard atomic spectra database " contrast, must cause element kind identification error.
Summary of the invention
The objective of the invention is to set up a kind of laser induced dissociation spectrum investigating system of space environmental simulation work, and can avoid because there is the detection method of " wavelength accuracy " problem in alignment CCD grating spectrograph.
Laser induced dissociation spectrum investigating system of the present invention comprises: pulsed laser 1, converging optical lens 2, spectrometer 3, pulse daley generator 4, computing machine 5, sample chamber 6.It is characterized in that:
The sample chamber is the vacuum chamber of a virtual space air pressure conditions, and vacuum chamber is tightly connected by O RunddichtringO and cylindrical shell 602 by base 601 and forms.
Be equipped with threaded objective table pillar 604 on the base, the objective table 603 by the threaded adjusting height is housed on the pillar.
On base, on the next door of objective table, be equipped with " T " font support 605 of fixing optical fiber probe 7, probe is fixed on the cross bar 6052 of " T " font support by screw 6051, " T " but the cross bar 6052 of font support by screw 6053 fixing up-down adjustment.
Cylinder lateral wall is equipped with dismountable form 606 and vacuum suction valve 607, and form is used for access sample and observation sample by the state of laser excitation.
The cylindrical shell top is equipped with convergent lens 2 and the optical fiber introduction pipe 608 by the sealing of O RunddichtringO.
Be connected with A vacuum Quick Release Hoop 8, corrugated tube 9, B vacuum Quick Release Hoop 10 with introduction pipe 608 vacuum seal successively.
One end of A optical fiber 11 connects fibre-optical probe 7, and the other end passes, passes successively A vacuum Quick Release Hoop 8, corrugated tube 9, is connected with vacuum fibre-optical splice 12 light from the introduction pipe 608 of vacuum chamber.Vacuum fibre-optical splice 12 constitutes vacuum seal with B vacuum Quick Release Hoop 10 and is connected, and finishes optical fiber and passes outside the vacuum chamber in vacuum chamber.The effect of corrugated tube mainly is to support A optical fiber, avoids optical fiber to fracture.In addition, corrugated tube has certain retractility, adjusts the alignment error of fibre-optical probe with this.
The light beam that laser instrument sends is on convergent lens 2 focuses on sample on the objective table.The plasma spectrum that the laser excitation sample produces is by fibre-optical probe 7, and A optical fiber 11, vacuum fibre-optical splice 12, the B optical fiber 13 that is connected with fibre-optical probe 7 light is coupled in the entrance slit of spectrometer successively.When laser instrument is luminous, send synchronizing signal trigger pulse delayer, trigger spectrometer after delayed again and gather spectrum, the spectral signal that spectrometer produces is connected with computing machine by USB interface after its A/D conversion.The collection and the process software of the spectroscopic data that spectroscopic data that standard model records and unknown sample record are installed in the computing machine.
The method of utilizing described system that the measured matter elemental composition is surveyed, it comprises the following steps:
§ 1 puts into standard model on the objective table 603 of vacuum chamber, regulates the position of laser instrument 1 and objective table, makes light beam that laser instrument sends on converging optical lens 2 focuses on sample on the objective table;
§ 2 regulates the position of probe 7, and the plasma spectrometry that sample ionization is produced converges and enters probe;
3 pairs of sample chambers of § vacuumize, and vacuum tightness is extracted into 5 * 10
-5Pa;
§ 4 opens laser instrument, the light beam that laser instrument sends is injected sample, the plasma spectrometry that sample ionization produces enters probe 7 and assembles, and converging light is coupled in the entrance slit of spectrometer 3 by A optical fiber 11, vacuum fibre-optical splice 12, the B optical fiber 13 that is connected with fibre-optical probe 7 light successively; When laser instrument sends light beam, send synchronizing signal trigger pulse delayer, trigger spectrometer after delayed again and gather spectrum, the spectral signal that spectrometer produces is imported computing machine by USB interface after its A/D conversion;
§ 5 so repeats § 1-4 step repeatedly, obtains series of standards sample atoms spectral line, and the form of these standard model atomic spectral line data with database is stored in the computing machine;
§ 6 changes unknown sample with standard model, repeats § 1-4 step, obtains unknown sample atomic spectral line data and deposits computing machine in, contrasts identification with the standard model atomic spectral line of storing in the computing machine, obtains the contained element kind of information of unknown sample.
Advantage of the present invention is:
1. the foundation of simulated space condition can verify that laser induced dissociation spectrographic detection technology is applied to the feasibility of survey of deep space.
2. utilize system self to obtain the atomic spectrum data of standard model and the atomic spectrum data of unknown sample are carried out the contrast of spectral line peak value and profile, finish this measuring method of sample element identification has been offset the error that system self introduces, make the measuring error vanishing in principle; And this recognition methods not only is applicable to the laser induced dissociation spectrographic detection under the vacuum condition, also has universality.
Description of drawings
Fig. 1 is a measuring system structural representation of the present invention;
Fig. 2 is the structural representation of sample chamber;
Fig. 3 is element identification computer software process flow diagram used in the measuring method of the present invention.
Embodiment
Provide better embodiment of the present invention according to Fig. 1～Fig. 3 below, in order to architectural feature of the present invention to be described, technical feature and functional characteristics, rather than be used for limiting scope of the present invention.
System comprises following several sections:
1) laser instrument
Select the Nd:YAG Q-switched pulse laser for use, operation wavelength 1064nm, pulsewidth 3-5ns, maximum impulse energy 200mJ, pulse energy stability ± 2%, maximum impulse repetition frequency 20Hz, the laser-beam divergence angle is less than 1mrad.The light beam that laser instrument sends is used for excited sample and produces plasma spectrum.
2) spectrometer
Spectrometer is used for the laser induced plasma spectrum that probe is collected is done spectral analysis.Spectrometer adopts concave grating.Grating response wave length 200-600nm, groove 1200g/mm.Spectrometer entrance slit 14 μ m, spectral resolution is better than 0.5nm, and the spectrometer wavelength accuracy is better than ± 0.2nm.The spectrometer detector adopts alignment CCD chip, and spectral signal is connected with computing machine by USB interface after its A/D conversion.
3) pulse daley generator
The pulse daley generator is mainly used to realize the time explanation detection of laser induced plasma spectrum, is used for suppressing the plasma continuous spectrum background of bremstrahlen and recombination radiation generation, improves and surveys signal to noise ratio (S/N ratio).The delay precision of pulse-delay unit is better than 1 μ s, and manual regulated at will.The output impulse form of pulse-delay unit can freely be provided with.
4) vacuum chamber
Vacuum chamber provides the virtual space acquisition environment for sample, and maximum vacuum can reach 5 * 10
-5Pa.
5) computing machine
The spectrum data gathering process software is housed in the computing machine, and spectrometer links to each other with computing machine by USB interface, and data acquisition and processing (DAP) software is realized the collection and the processing of spectroscopic data, display light spectral curve, indicating characteristic wavelength in real time in real time.
Claims (2)
1. the laser induced dissociation spectrum investigating system of a space environmental simulation comprises: pulsed laser
(1), converging optical lens (2), spectrometer (3), pulse daley generator (4), computing machine (5), sample chamber (6), it is characterized in that:
Sample chamber (6) is the vacuum chamber of a virtual space air pressure conditions, and vacuum chamber is tightly connected by O RunddichtringO and cylindrical shell (602) by base (601) and forms;
Be equipped with threaded objective table pillar (604) on the base, the objective table (603) by the threaded adjusting height is housed on the pillar;
On base, next door at objective table, be equipped with " T " font support (605) of fixing optical fiber probe (7), probe is fixed on the cross bar (6052) of " T " font support by screw (6051), the cross bar (6052) of " T " font support by screw (6053) but fix up-down adjustment;
Cylinder lateral wall is equipped with dismountable form (606) and vacuum suction valve (607);
The cylindrical shell top is equipped with convergent lens (2) and the optical fiber introduction pipe (608) by the sealing of O RunddichtringO;
Be connected with A vacuum Quick Release Hoop (8), corrugated tube (9), B vacuum Quick Release Hoop (10) with introduction pipe (608) vacuum seal successively;
One end of A optical fiber (11) connects fibre-optical probe (7), and the other end passes, passes successively A vacuum Quick Release Hoop (8), corrugated tube (9), is connected with vacuum fibre-optical splice (12) light from the introduction pipe (608) of vacuum chamber; Vacuum fibre-optical splice (12) constitutes vacuum seal with B vacuum Quick Release Hoop (10) and is connected;
The light beam that laser instrument sends is on convergent lens (2) focuses on sample on the objective table; The plasma spectrum that the laser excitation sample produces is by fibre-optical probe (7), and A optical fiber (11), vacuum fibre-optical splice (12), the B optical fiber (13) that is connected with fibre-optical probe (7) light is coupled in the entrance slit of spectrometer successively;
When laser instrument is luminous, send synchronizing signal trigger pulse delayer, trigger spectrometer after delayed again and gather spectrum, the spectral signal that spectrometer produces is connected with computing machine by USB interface after its A/D conversion;
The collection and the process software of the spectroscopic data that spectroscopic data that standard model records and unknown sample record are installed in the computing machine.
2. the method for utilizing described system that the measured matter elemental composition is surveyed, it comprises the following steps:
§ 1 puts into standard model on the objective table (603) of vacuum chamber, regulates the position of laser instrument (1) and objective table, makes light beam that laser instrument sends on converging optical lens (2) focuses on sample on the objective table;
§ 2 regulates the position of probe (7), and the plasma spectrometry that sample ionization is produced converges and enters probe;
3 pairs of sample chambers of § (6) vacuumize, and vacuum tightness is extracted into 10
-5Pa;
§ 4 opens laser instrument, and the light beam that laser instrument sends is injected sample, and the plasma spectrometry that ionization produces enters probe and assembles, and is coupled in the entrance slit of spectrometer (3) through optical fiber; When laser instrument sends light beam, send synchronizing signal trigger pulse delayer (4), trigger spectrometer after delayed again and gather spectrum, the spectral signal that spectrometer produces is imported computing machine (5) by USB interface after its A/D conversion;
§ 5 so repeats § 1-4 step repeatedly, obtains series of standards sample atoms spectral line, and the form of these standard model atomic spectral line data with database is stored in the computing machine;
§ 6 changes unknown sample with standard model, repeats § 1-4 step, obtains unknown sample atomic spectral line data and deposits computing machine in, contrasts identification with the standard model atomic spectral line of storing in the computing machine, obtains the contained element kind of information of unknown sample.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102147363A (en) * | 2011-01-10 | 2011-08-10 | 东南大学 | Device and method for detecting surface cleanness of material |
| CN102608079A (en) * | 2012-03-03 | 2012-07-25 | 南昌航空大学 | Detection method of long-distance laser induced plasma spectrum |
| CN102692399A (en) * | 2012-05-25 | 2012-09-26 | 四川大学 | Small multifunctional sample room for LIBS (laser-induced breakdown spectroscopy) |
| CN105575725A (en) * | 2016-02-22 | 2016-05-11 | 西安交通大学 | Online monitoring device and method of vacuum degree of vacuum arc extinguishing chamber in vacuum switch |
| CN110082342A (en) * | 2019-02-26 | 2019-08-02 | 天津大学 | Utilize the method and apparatus of laser spectrum measurement Combustion Flow Field material composition concentration |
| CN111257305A (en) * | 2020-03-31 | 2020-06-09 | 北京农业智能装备技术研究中心 | Two-dimensional correlation LIBS spectral measurement method, system and device |
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| US6466309B1 (en) * | 1999-02-26 | 2002-10-15 | California Institute Of Technology | Method and apparatus for chemical and topographical microanalysis |
| CN1243233C (en) * | 2003-07-18 | 2006-02-22 | 华中科技大学 | Analyser for spark through spectrum medium by laser induced |
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- 2006-08-17 CN CN200610030143A patent/CN1908626B/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102147363A (en) * | 2011-01-10 | 2011-08-10 | 东南大学 | Device and method for detecting surface cleanness of material |
| CN102147363B (en) * | 2011-01-10 | 2013-02-13 | 东南大学 | Device and method for detecting surface cleanness of material |
| CN102608079A (en) * | 2012-03-03 | 2012-07-25 | 南昌航空大学 | Detection method of long-distance laser induced plasma spectrum |
| CN102608079B (en) * | 2012-03-03 | 2015-04-08 | 南昌航空大学 | Detection method of long-distance laser induced plasma spectrum |
| CN102692399A (en) * | 2012-05-25 | 2012-09-26 | 四川大学 | Small multifunctional sample room for LIBS (laser-induced breakdown spectroscopy) |
| CN105575725A (en) * | 2016-02-22 | 2016-05-11 | 西安交通大学 | Online monitoring device and method of vacuum degree of vacuum arc extinguishing chamber in vacuum switch |
| CN105575725B (en) * | 2016-02-22 | 2017-10-20 | 西安交通大学 | The vacuum on-Line Monitor Device and method of vacuum interrupter in a kind of vacuum switch |
| CN110082342A (en) * | 2019-02-26 | 2019-08-02 | 天津大学 | Utilize the method and apparatus of laser spectrum measurement Combustion Flow Field material composition concentration |
| CN110082342B (en) * | 2019-02-26 | 2021-12-07 | 天津大学 | Method and device for measuring concentration of combustion flow field substance component by using laser spectrum |
| CN111257305A (en) * | 2020-03-31 | 2020-06-09 | 北京农业智能装备技术研究中心 | Two-dimensional correlation LIBS spectral measurement method, system and device |
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