CN101089612A - Laser induction atomic emission spectrum investigating system and method of time resolution - Google Patents
Laser induction atomic emission spectrum investigating system and method of time resolution Download PDFInfo
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- CN101089612A CN101089612A CN 200710043529 CN200710043529A CN101089612A CN 101089612 A CN101089612 A CN 101089612A CN 200710043529 CN200710043529 CN 200710043529 CN 200710043529 A CN200710043529 A CN 200710043529A CN 101089612 A CN101089612 A CN 101089612A
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Abstract
A spectrum detection system with time resolution in laser induced atom emission type is prepared as using converging/receiving common optical unit to simplify system structure and system-focusing link, using laser outgoing pulse as reference synchronous signal to realize high accuracy of time, utilizing CCD image transducer with overflow channel to realize time resolution function being able to be adjusted on microsecond grade, using up-level computer to control system parameter and to realize data communication through USB controller.
Description
Technical field:
The present invention relates to a kind of detection system, belong to spectral detection, technical field of photoelectric detection with induced with laser atomic emission spectrum of time resolution characteristics.
Background technology:
Induced with laser atomic emission spectrum technology is born in the middle and later periods in 20th century, principle according to laser and matter interaction, utilize laser pulse to make material surface ionization at high temperature produce plasma emission spectrum, with this spectral translation is electric signal, according to value of electrical signals of setting up and the corresponding relation between the spectral radiance, can be qualitative, content in the quantitative test material, be a kind ofly can realize that multielement detects simultaneously, the technological means of component content quantification Measurement and analysis, have non-destruction and noncontact, need not take a sample and carry out sample pretreatment, the simultaneity of multielement, but on-the site analysis, the measuring object form can be a solid, liquid, gas, have higher detection efficiency, this technology successfully is applied to a plurality of fields.
The detection system of the induced with laser atomic emission spectrum that current paper is reported, the structural principle basically identical of itself and traditional detection system comprises laser system, spectrum collection system, spectrometer system, or adds the data preprocessing part.In these systems, at first the laser convergence system separates with the spectrum collection system, and the optical axis on general spectrum collection system light path and laser beam incident road is greater than 0 ° of angle collection plasma spectrum; The high-precision delay controller of the general sampling of the time delay of spectrometer system, its synchronous working signal is served as by the electric synchronizing signal of laser instrument output; The general equipment associating delay controller of the similar shutter that adds that uses of the shielding of the interior focusing time delay signal before the integration of system is finished jointly.Such device can collect spectral signal effectively, and can come the control lag time by delay controller, can realize the research of higher time-resolved spectral properties.
Though existing detection system can be finished the spectrographic detection work under laboratory or the open-air manually-operated condition, but convergence/receiving optics discrete in the system is under unmanned situation about participating in, contactless when target object is surveyed the coordination focus process complexity and the precision of two cover optical systems not high, reduced work efficiency; Synchronizing signal is generally taken from laser system output electric signal, and is interpulse poor if having time with laser emitting; External time, delay control unit increased the volume and the cost of system, and it needs artificial Attended Operation, and these shortcomings make existing equipment be difficult to the effect that performance is used in unmanned participation, the demanding application of automaticity such as survey of deep space in future.
Summary of the invention:
The objective of the invention is to: the deficiency that in the detection of following deep space or rugged surroundings, exists at above-mentioned existing detection system, the reliability that has proposed with simplied system structure, the weight and volume that reduces system, raising system is the system design and the implementation method of main target, keeps the original characteristic of induced with laser spectrum Detection Techniques simultaneously.
Technical scheme of the present invention is as follows:
According to time resolution laser induced dissociation spectrum investigating system of the present invention, comprising: pulse laser generation systems, laser pulse and shared convergence/receiving optics, synchronization signal generating apparatus, spectrometer, signal Processing communication system and upper computer control system.
Wherein spectrometer comprises beam splitting system, spectral detection treatment circuit system, it is characterized in that: it is optical system shared between described laser pulse exit portal and the testing sample surface convergence/reception to be installed, described synchronization signal generating apparatus receives the laser emitting pulse from the laser emitting mouth by beam splitting chip, described spectral detection treatment circuit system is for overflowing the ccd image sensor of channel structure based on band, and, use the communication and the data transmission of realization of USB control chip and host computer in conjunction with programmable logic device realization time resolution control function.
Time resolution laser induced dissociation spectrum investigating system workflow of the present invention is as follows:
S1. send startup command after setting necessary initiation parameter in the upper computer control system, laser instrument produces pulse laser beam, produces the two-way laser beam through beam splitting chip;
S2. it is optical system shared that the saturating catoptron of this one road laser beam process is input to convergence/reception, and another road laser beam then is input to synchronization signal generating apparatus;
S3. the laser that incides synchronization signal generation apparatus behind beam splitting chip is at first had the PIN pipe seizure of high-speed response ability, the electric signal that produces passes through high speed amplifier, comparer and level translator in turn, form impulse level, output in the spectral detection treatment circuit system, as time synchronizing signal;
S4. this saturating catoptron has the transmission effect to laser beam wavelength (laser instrument of the 1064nm that uses in the system), to wavelength is that laser below the 1000nm has reflex, the laser beam of transmission outputs to the optical system shared quilt afterwards of convergence/reception and is converged to the measured target object surfaces, thereby makes it produce plasma spectrometry under laser action;
S5. the input end that outputs to reflecting surface back reflection to the section Transmission Fibers of catoptron after the optical system shared collection is assembled/received to the optical system shared optical system of being made up of one group of positive and negative lens systems with convergence function of convergence/reception, the plasma emission spectroscopy that induced with laser produces;
S6. plasma emission spectrum is input in the spectrometer after another Transmission Fibers, finishes opto-electronic conversion and signal Processing through the spectral detection Circuits System that incides ccd image sensor behind the grating beam splitting again;
S7. in computing machine, data transfer mode adopts asynchronous mode to spectroscopic data by the link transmission between USB chip and the host computer, and frequency of operation can be 0 to detector limiting frequency f
MaxBetween be provided with arbitrarily, by host computer data are preserved demonstration with real-time spectrum or view data.
Compare with existing detection system, the present invention has used the laser emitting pulse synchronous signal generating means of design voluntarily, realize synchronously accurate, avoided the synchronous and outgoing pulse crank-up time interval factor affecting constantly of laser instrument electric signal, the optical system shared system architecture of having simplified of convergence/reception of design, improved focusing efficient, reduced the volume and weight of system, channel structure is realized postponing and the control of integral time for overflowing of utilizing directly that the CCD device has, can make temporal resolution reach the microsecond magnitude, satisfy the demand of detection analysis, and kept conventional laser to induce the characteristics of disassociation spectral technique.
Description of drawings:
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the structured flowchart of time resolution laser induction atomic emission spectrum investigating system.
Fig. 2 is the synchronization signal generating apparatus theory diagram.
Fig. 3 is a spectral detection treatment circuit system chart, and wherein 701 are the logic control chip, and 702 are the input master clock signal, 703 is outer synchronous triggering signal, and 704 is ccd image sensor, and 705 is signal processing chip, 706 is the digital signal cache chip, and 707 is the USB control chip.
Embodiment:
In the system shown in Figure 1, laser instrument 1 is the Nd:YAG Q-switched pulse laser, operation wavelength 1064nm, and the about 7ns of pulsewidth, maximum impulse energy 200mJ, pulse energy stability ± 2%, the laser-beam divergence angle is less than 1mrad.The laser beam that laser instrument sends is used to excite testing sample to produce plasma emission spectrum.
The beam splitting chip 2 of a slice and laser beam aspect angle at 45 is at first passed through in laser instrument 1 output pulse, see also Fig. 2 and Fig. 1, can from laser pulse, reflect the sub-fraction laser energy, incide in the photodiode 501, photodiode 501 selects guide type to have the high-speed response ability usually, and rising edge generally can reach the Pin photodiode of several nanoseconds; Recommend to use the operational amplifier 502 of high bandwidth, gain amplifier generally is made as 5～10 times, and the output of amplifier 502 and the compare threshold of a setting are compared, and the logic output signal of generation is output as synchronization pulse through behind the electric pressure converter 504.
The saturating catoptron 3 that can select the laser pulse of incident and the spectral signal of collecting, should film on the two sides respectively altogether, make it possible to throw the laser and the plasma emission spectroscopy of reflection of 1064nm wavelength less than the 1000nm wavelength, the spectrum of reflected light signal is input to an end of one section Transmission Fibers 8, after optical fiber 8 transmission, be input to spectrometer system 6, spectrometer in this system 6 adopts flat filed concave grating simple in structure as light-splitting device, the function that beam split is not only arranged, the effect that also has collimation and assemble.
The spectrum that obtains after the beam split incides in the spectral detection treatment circuit system 7, see also Fig. 3 and Fig. 1, the electric signal corresponding to plasma resonance spectrum that produces is input in the buffer 706 through the digital signal that AD converter 705 produces, according to data transfer instruction by USB controller 707 with digital data transmission in host computer 9.
In the experimental system of principle prototype, use PC as host computer 9, after installing the acquisition system Control Software, can be directly the running parameter of the spectral detection treatment circuit system of system be provided with, software systems are carried out image data, storage simultaneously and are shown in real time under the mode of operation of multithreading.
Claims (7)
1, a kind of time-resolved laser induction atomic emission spectrum investigating system, comprise: pulse laser generation systems, laser pulse and convergence/reception are optical system shared, synchronization signal generating apparatus, spectrometer, data communication acquisition system and upper computer control system, and wherein spectrometer comprises beam splitting system, photo-translating system, data handling system.Total system is characterised in that: it is optical system shared between described laser pulse exit portal and the testing sample surface convergence/reception to be installed, described synchronization signal generating apparatus receives the laser emitting pulse from the laser emitting mouth by beam splitting chip, described photo-translating system is for overflowing the ccd image sensor of channel structure based on band, and realize the control of time resolution control function in conjunction with programmable logic device, described data handling system is for being with two high resolution A conversion and noise filter place circuit that adopt functions of being correlated with, communication and data transmission between described data communication acquisition system use USB control chip realization and the host computer.
2, time-resolved laser induction atomic emission spectrum investigating system according to claim 1, it is characterized in that: described convergence/reception is optical system shared to be meant, the shared same optical focusing system of laser emitting light beam and laser induced dissociation generation light, used the combination of one group of positive and negative mirror to make this optical system shared realization have the function of assembling and focusing, the laser emitting light beam throwed 45 ° of saturating catoptrons of a slice and focused on the measured target surface by convergent mirror, and the spectral signal that dissociates out arrives the optical input of spectrometer system through saturating mirror reflects after convergent mirror is collected.
3, time-resolved laser induction atomic emission spectrum investigating system according to claim 2, it is characterized in that: described 45 ° of saturating catoptrons, it can transmission peak wavelength be the laser beam of 1064nm that its transmission plane is filmed, and reflecting surface is filmed and can be reflected the following light of 1000nm wavelength.
4, time-resolved induced with laser atomic emissions atomic emission spectrum investigating system according to claim 1, it is characterized in that: described synchronization signal generating apparatus, its use has the photodiode of capability of fast response and catches the laser emitting pulse, through exporting a pulse signal after high speed amplifier, comparer and the level translator, as the synchronizing signal of detection system work.
5, time-resolved induced with laser atomic emissions atomic emission spectrum investigating system according to claim 1, it is characterized in that: described based on having the ccd image sensor that overflows channel structure, realize the control of the work schedule state of detection system by programming device, comprise detection to plasma emission spectroscopy with time resolution feature, and time delay, integral time parameter host computer program control, minimum time is differentiated the frequency of operation decision of parameter by sensor, generally can reach the hundreds of nanosecond order of magnitude.
6, time-resolved laser induction atomic emission spectrum investigating system according to claim 1 is characterized in that: use the USB68013A chip of Cypress company, by asynchronous system realize data collection and and host computer between communication.
7, a kind of time resolution control method of laser induced dissociation spectrographic detection comprises step:
S1. send startup command after setting necessary initiation parameter in the upper computer control system, laser instrument produces pulsed laser beam, produces the two-way laser beam through beam splitting chip;
S2. it is optical system shared that the saturating catoptron of one road laser beam process is input to convergence/reception, and another road laser beam then is input to synchronization signal generating apparatus;
S3. the laser that incides synchronization signal generation apparatus behind beam splitting chip is at first had the PIN pipe seizure of high-speed response ability, the electric signal that produces passes through high speed amplifier, comparer and level translator in turn, form logic-level pulses afterwards, output in the spectral detection treatment circuit system, as time synchronizing signal;
S4. this saturating catoptron has the transmission effect to laser beam wavelength (laser instrument of the 1024nm that uses in the system), to wavelength is that laser below the 1000nm has reflex, the laser beam of transmission outputs to convergence/reception and is focused the measured target object surfaces after optical system shared, thereby makes it produce plasma spectrometry under laser action;
S5. the input end that is reflected to one section Transmission Fibers behind the reflecting surface that outputs to catoptron after the optical system shared collection is assembled/received to the optical system shared optical system of being made up of one group of positive and negative lens systems with convergence function of convergence/reception, the plasma emission spectroscopy that induced with laser produces;
S6. plasma emission spectrum is input in the spectrometer after another Transmission Fibers, finishes opto-electronic conversion and signal Processing through inciding the spectral detection Circuits System that comprises the ccd image sensor composition behind the grating beam splitting;
S7. in computing machine, data transfer mode adopts asynchronous mode to spectroscopic data by the link transmission between USB chip and the host computer, and frequency of operation can be 0 to detector limiting frequency f
MaxBetween be provided with arbitrarily, by host computer data are preserved demonstration with real-time spectrum or view data.
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| CN101696936B (en) * | 2009-10-22 | 2011-07-20 | 浙江师范大学 | Laser induced discharge reinforcement plasma spectrum detection device |
| CN102364329A (en) * | 2011-09-19 | 2012-02-29 | 华东师范大学 | Automatic collection system of laser-induced breakdown spectroscopy |
| CN102735658A (en) * | 2012-07-17 | 2012-10-17 | 中国科学技术大学 | Time resolution laser-induced breakdown spectroscopy measuring method |
| CN102967563A (en) * | 2012-11-26 | 2013-03-13 | 东莞博莱特生物科技有限公司 | Device and method for acquiring dioxin toxoid signals |
| CN104062269A (en) * | 2013-03-18 | 2014-09-24 | 中国科学院大连化学物理研究所 | Nanosecond time-resolved absorption and emission spectrum measuring device and measuring method |
| CN104198450A (en) * | 2014-08-27 | 2014-12-10 | 江苏锐汗德医疗科技有限公司 | Light path detection device for full-automatic time resolution detector |
| CN105445228A (en) * | 2015-12-11 | 2016-03-30 | 中国科学院等离子体物理研究所 | Superhigh-temporal resolution laser Thomson scattering diagnosis system |
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| CN108680559A (en) * | 2018-04-29 | 2018-10-19 | 天津大学 | Laser induced breakdown spectroscopy ICCD time discrimination measurement method and systems |
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| CN102735658A (en) * | 2012-07-17 | 2012-10-17 | 中国科学技术大学 | Time resolution laser-induced breakdown spectroscopy measuring method |
| CN102967563A (en) * | 2012-11-26 | 2013-03-13 | 东莞博莱特生物科技有限公司 | Device and method for acquiring dioxin toxoid signals |
| CN104062269B (en) * | 2013-03-18 | 2016-08-10 | 中国科学院大连化学物理研究所 | The Absorption and emission spectra measurement apparatus of nanoseconds resolution and measuring method |
| CN104062269A (en) * | 2013-03-18 | 2014-09-24 | 中国科学院大连化学物理研究所 | Nanosecond time-resolved absorption and emission spectrum measuring device and measuring method |
| CN104198450A (en) * | 2014-08-27 | 2014-12-10 | 江苏锐汗德医疗科技有限公司 | Light path detection device for full-automatic time resolution detector |
| CN105445228A (en) * | 2015-12-11 | 2016-03-30 | 中国科学院等离子体物理研究所 | Superhigh-temporal resolution laser Thomson scattering diagnosis system |
| CN107817239A (en) * | 2016-09-13 | 2018-03-20 | 中国科学院沈阳自动化研究所 | A kind of LIBS spectral correction methods based on plasma position information |
| CN107817239B (en) * | 2016-09-13 | 2019-06-18 | 中国科学院沈阳自动化研究所 | A kind of LIBS spectral correction method based on plasma position information |
| CN108680559A (en) * | 2018-04-29 | 2018-10-19 | 天津大学 | Laser induced breakdown spectroscopy ICCD time discrimination measurement method and systems |
| CN109000795A (en) * | 2018-06-25 | 2018-12-14 | 西北核技术研究所 | A kind of pulse laser spectral temporal resolution and measurement system and measurement method |
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