CN203894165U - Collinear double-pulse laser-induced breakdown spectroscopy (LIBS) technology-based device for rapidly detecting benzopyrene content in edible oil - Google Patents
Collinear double-pulse laser-induced breakdown spectroscopy (LIBS) technology-based device for rapidly detecting benzopyrene content in edible oil Download PDFInfo
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- CN203894165U CN203894165U CN201420301798.9U CN201420301798U CN203894165U CN 203894165 U CN203894165 U CN 203894165U CN 201420301798 U CN201420301798 U CN 201420301798U CN 203894165 U CN203894165 U CN 203894165U
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Abstract
The utility model discloses a collinear double-pulse laser-induced breakdown spectroscopy (LIBS) technology-based device for rapidly detecting benzopyrene content in edible oil, wherein a double-pulse width solid-state laser is connected with a digital pulse delay device; one end of an energy meter is connected with a laser beam generated by the double-pulse width solid-state laser; the other end of the energy meter is connected with a feedback device; the digital pulse delay device is respectively connected with a spectrograph and the feedback device; a reflector is arranged at the rear end of the laser beam generated by the double-pulse width solid-state laser, and is arranged at the front end of a focusing lens; an objective table is arranged below the focusing lens; glass ware is arranged on the objective table; an adsorption sample carrier is arranged inside the glass ware; an argon bottle is arranged on one side of the glass ware, and extends into the glass ware; a second focusing lens is arranged on one side above the adsorption sample carrier and is connected with the spectrograph; and a data storage device is connected with the spectrograph. The device disclosed by the utility model does not need to preprocess a sample, rapid real-time detection can be carried out, real-time monitoring and on-site rapid sampling inspection of the production process of the edible oil are achieved, and the working efficiency is effectively improved.
Description
Technical field
The utility model relates to food inspection technical field, is specially a kind of device based on conllinear dipulse LIBS technology fast detecting benzopyrene from edible oil content.
Background technology
Benzopyrene claims again benzo (a) pyrene, and english abbreviation BaP is a kind of high activity indirect-acting carcinogen, huge to the harm of human body.Human body produces ultimate carcinogen after taking under oxidasic effect, causes the generation of the malignant tumours such as cancer of the stomach, liver cancer, intestinal cancer.In addition, benzo (a) pyrene also has teratogenesis and mutagenicity, can cause DNA damage and mammal sperm distortion etc.And the necessity that edible oil is people lives, in edible oil, the food safety affair of benzo (a) pyrene content overproof takes place frequently in recent years, and the healthy of people in serious harm.Therefore, be necessary the benzo in edible oil (a) pyrene content to detect, to eliminate potential potential safety hazard.
At present, in edible oil, the detection method of benzo (a) pyrene mainly contains fluorescence spectrophotometry, high performance liquid chromatography, gas chromatography-mass spectrography etc.; There is loaded down with trivial details, the consuming time length of operating process, high in cost of production shortcoming in said method, can not meet benzo (a) pyrene content Real-Time Monitoring and the on-the-spot sampling Detection fast of edible fat production process.Conllinear dipulse-Laser-induced Breakdown Spectroscopy (LIBS) technology is to adopt two bundle conllinear laser to irradiate successively sample, and induction produces plasma, and the spectrum of laser plasma signal obtaining by analysis spectrometer carrys out detection material component content.And reaching its maturity along with conllinear dipulse-Laser-induced Breakdown Spectroscopy (LIBS) technology, how by conllinear dipulse-Laser-induced Breakdown Spectroscopy (LIBS) technological guide, to produce plasma, and utilize analysis spectrometer to obtain spectrum of laser plasma signal and carry out detection material component content, without sample pretreatment, non-destructive, benzo (a) the pyrene content detecting in edible oil in real time fast have become those skilled in the art's important technological problems urgently to be resolved hurrily.
Utility model content
The technical matters that the utility model solves is to provide a kind of device based on conllinear dipulse LIBS technology fast detecting benzopyrene from edible oil content, to solve the shortcoming in above-mentioned background technology.
The technical matters that the utility model solves realizes by the following technical solutions:
Method based on conllinear dipulse LIBS technology fast detecting benzopyrene from edible oil content, first collect separate sources and there is the edible oil sample of different benzopyrene content, then benzopyrene content prediction model is processed and is set up in the edible oil sample analysis of collecting, finally edible oil to be measured is processed in the benzopyrene content prediction model of rear input foundation, the benzopyrene content that can obtain fast edible oil to be measured, concrete steps are as follows:
1) collect the edible oil sample of separate sources and different benzopyrene content;
2) utilize two pulsewidth solid state lasers to produce two bundle conllinear laser, and irradiate successively the edible oil sample surface of collecting in step 1), to produce edible oil sample plasma;
3) by spectrometer obtaining step 2) the middle edible oil sample plasma light spectrum signal producing, and edible oil sample plasma light spectrum signal is carried out to pre-service: adopt wavelet analysis to remove the noise in edible oil sample plasma light spectrum signal, and edible oil sample plasma light spectral intensity is normalized;
4) determination step 1) in benzopyrene real content in the edible oil sample collected;
5) utilize genetic algorithm and ant group algorithm extraction step 3) in the characteristic wavelength of benzopyrene in pretreated edible oil sample plasma spectrometry, the wavelength variable that first utilizes genetic algorithm screening edible oil sample plasma spectrometry adopts ant group algorithm to obtain the characteristic wavelength of edible oil sample benzopyrene on the basis of screening;
6) extraction step 5) in the spectral intensity of the benzopyrene characteristic wavelength that obtains, and apply Hopfield neural network and the benzopyrene characteristic wavelength spectral intensity of extraction and the benzopyrene real content value of measuring in step 4) are carried out associated, set up benzopyrene content prediction model;
7) utilize two pulsewidth solid state lasers to produce two bundle conllinear laser, and irradiate successively in edible oil to be measured surface, to produce edible oil plasma to be measured, and by spectrometer, obtain the plasma light spectrum signal of edible oil to be measured;
8) to obtaining the plasma light spectrum signal of edible oil to be measured in step 7), carry out pre-service, adopt wavelet analysis to remove the noise in the plasma light spectrum signal of edible oil to be measured, and edible oil plasma light spectral intensity to be measured is normalized;
9) extraction step 8) in the spectral intensity of benzopyrene characteristic wavelength in the plasma spectrometry of pretreated edible oil to be measured, and the spectral intensity of benzopyrene characteristic wavelength in the plasma spectrometry of the edible oil to be measured extracting is input in the benzopyrene content prediction model of setting up in step 6), can obtain fast the benzopyrene content of edible oil to be measured.
In the utility model, described step 2) in, for preventing that airborne elemental composition from impacting testing result, first in edible oil sample surface, spray argon gas stream, the two pulsewidth solid state lasers of recycling produce conllinear laser, be radiated at and spray the edible oil sample surface that has argon gas stream, to produce edible oil sample plasma.
In the utility model, described step 2) in, conllinear Ear Mucosa Treated by He Ne Laser Irradiation, before edible oil sample surface, converges by condenser lens, and being convenient to has the carrier surface of edible oil sample to carry out ablation, gasification, ionization to absorption, is conducive to produce plasma.
In the utility model, in described step 4), the benzopyrene real content in the edible oil sample of collecting in step 1) is measured and adopted national standard method GB/T 5009. 27-2003.
In the utility model, in described step 7), edible oil jet surface to be measured has argon gas stream.
Device based on conllinear dipulse LIBS technology fast detecting benzopyrene from edible oil content, method based on above-mentioned conllinear dipulse LIBS technology fast detecting benzopyrene from edible oil content, comprises two pulsewidth solid state lasers, energy meter, catoptron, condenser lens, argon bottle, glassware, objective table, absorption sample carriers, the second condenser lens, spectrometer, ultramagnifier, data-carrier store and digit pulse delayer; Wherein, two pulsewidth solid state lasers are connected with digit pulse delayer, and energy meter one end is connected with the laser beam that two pulsewidth solid state lasers produce, and the other end is connected with ultramagnifier, and digit pulse delayer is connected with spectrometer, ultramagnifier respectively; Catoptron is arranged on the laser beam rear end that two pulsewidth solid state lasers produce, and be positioned at the front end of condenser lens, objective table is arranged on the below of condenser lens, glassware is placed on objective table, and absorption sample carriers is placed in glassware, and argon bottle is arranged on glassware one side, and stretch in glassware, the second condenser lens is arranged on a side of absorption sample carriers top, and is connected with spectrometer, and data-carrier store is connected with spectrometer.
In the utility model, data-carrier store comprises computing machine, is convenient to the benzopyrene content of edible fat production process to carry out Real-Time Monitoring and on-the-spot sampling Detection fast.
In the utility model, absorption sample carriers comprises the filter paper layer that multi-layer filter paper forms, and in testing process, can, according to the number of plies of edible oil sample real-time transform filter paper layer, be conducive to save testing cost.
In the utility model, argon bottle stretches in glassware by conveyance conduit, is convenient to spray argon gas stream in absorption sample carriers.
In the utility model, the second condenser lens is connected with spectrometer by optical fiber.
In the utility model, before detecting, first in data-carrier store, set up benzopyrene content prediction model, again benzopyrene characteristic wavelength spectral intensity in the edible oil plasma spectrometry to be measured extracting is inputed to benzopyrene content prediction model, specific operation process is: first edible oil sample is adsorbed in filter paper layer, again absorption there is is the filter paper layer of edible oil sample to be placed in glassware, then open argon bottle and make argon gas stream spray the filter paper layer surface in adsorbing edible oil sample, trigger two pulsewidth solid state lasers and send laser beam, laser beam is by catoptron vertical reflection, line focus lens converge at the filter paper layer surface that absorption has edible oil sample again, have the surface of the filter paper layer of edible oil sample to carry out ablation, gasification, ionization successively to absorption, produce plasma, plasma signal is after the second condenser lens converges, spectrometer obtains the plasma light spectrum signal of edible oil sample, and the plasma light spectrum signal of edible oil sample is saved in and in data-carrier store, sets up benzopyrene content prediction model, finally detect benzopyrene characteristic wavelength spectral intensity in edible oil plasma spectrometry to be measured, and benzopyrene characteristic wavelength spectral intensity in the edible oil plasma spectrometry to be measured extracting is inputed to benzopyrene content prediction model is the content of known benzopyrene from edible oil to be measured, it has without sample pretreatment, nondestructive advantage.
In the utility model, for guaranteeing the stability of edible oil sample spectra collection, eliminate the impact of Laser Energy Change on edible oil sample spectrum, when edible oil sample spectra collection, by energy meter, monitor the energy of laser beam, and the energy value recording is fed back to ultramagnifier, and after ultramagnifier comparison, give digit pulse delayer and whether carry out spectra collection, can effectively improve the sharpness of collection.
Beneficial effect: the utlity model has without sample pretreatment, non-destructive and the quick advantage detecting in real time, and operating process is easy, consuming time low; Benzopyrene content Real-Time Monitoring and the on-the-spot sampling Detection fast that can meet edible fat production process simultaneously, effectively improved work efficiency, reduced hand labor intensity and production cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model preferred embodiment.
Embodiment
For technological means, creation characteristic that the utility model is realized, reach object and effect is easy to understand, below in conjunction with concrete diagram, further set forth the utility model.
Referring to the device based on conllinear dipulse LIBS technology fast detecting benzopyrene from edible oil content of Fig. 1, comprise two pulsewidth solid state lasers 1, laser beam 2, energy meter 3, catoptron 4, condenser lens 5, argon gas stream 6, argon bottle 7, glassware 8, objective table 9, filter paper layer 10, the second condenser lens 11, optical fiber 12, spectrometer 13, ultramagnifier 14, computing machine 15, digit pulse delayer 16.
In the present embodiment, specific operation process is: first edible oil sample is adsorbed on multi-layer filter paper, form the filter paper layer 10 of adsorbing edible oil sample, again absorption there is is the filter paper layer 10 of edible oil sample to be placed in glassware 8, then glassware 8 is positioned on objective table 9, open argon bottle 7, make argon gas stream 6 spray the surface that has the filter paper layer 10 of edible oil sample in absorption; Adopt digit pulse delayer 16 to trigger two pulsewidth solid state lasers 1, make two bundle laser of two pulsewidth solid state lasers 1 send laser beam 2 by certain hour interval, laser beam 2 is by catoptron 4 vertical reflections, through condenser lens 5, converge at the surface that absorption has the filter paper layer 10 of edible oil sample again, to absorption, there is the surface of the filter paper layer 10 of edible oil sample to carry out ablation, gasification, ionization successively, produce plasma; Then plasma signal converges through the second condenser lens 11, then enters spectrometer 13 through optical fiber 12, and spectrometer 13 obtains the plasma light spectrum signal of edible oil sample, and the plasma light spectrum signal of edible oil sample is saved in computing machine 15.Repeat above-mentioned steps, gather 230 separate sources and different benzopyrene content edible oil sample and the plasma spectrometry of 1 edible oil to be measured.
In the present embodiment, digit pulse delayer 16 is controlled the plasma light spectrum signal that spectrometer 13 obtains edible oil sample, and the plasma light spectrum signal of edible oil sample is saved in computing machine 15, for guaranteeing the stability of sample spectra collection, eliminate the impact of Laser Energy Change on sample spectrum, when sample spectra collection, by the energy of energy meter 3 monitoring laser beams 2, and the energy value recording is fed back to ultramagnifier 14, ultramagnifier compares the threshold value of the energy value of laser beam 2 and its inner setting, when the energy value of laser beam 2 depart from setting threshold 5% and when above, ultramagnifier 14 sends signal and informs that digit pulse delayer 16 control spectrometers 13 do not carry out spectra collection, when the energy value of laser beam 2 do not depart from setting threshold 5% and when above, ultramagnifier 14 does not send signal, digit pulse delayer 16 is controlled spectrometers 13 and is carried out spectra collection.
Plasma spectrometry to 230 of above-mentioned collection edible oil samples carries out pre-service, 1) adopt wavelet analysis to remove the noise of edible oil sample spectrum, and edible oil sample light spectral intensity is normalized; 2) adopt national standard method GB/T 5009. 27-2003 to measure the benzopyrene real content in edible oil sample; 3) to pretreated edible oil sample spectrum, utilize genetic algorithm and ant group algorithm to extract the characteristic wavelength of benzopyrene, the wavelength variable that first utilizes genetic algorithm screening edible oil sample spectrum, further adopts ant group algorithm to obtain the characteristic wavelength of edible oil sample benzopyrene on this basis; 4) extract the spectral intensity of edible oil sample benzopyrene characteristic wavelength, application Hopfield neural network is carried out the spectral intensity of edible oil sample benzopyrene characteristic wavelength and benzopyrene real content value associated, sets up benzopyrene forecast model.
The plasma spectrometry of 1 edible oil to be measured is carried out to pre-service: 1) adopt wavelet analysis to remove the noise of edible oil spectrum to be measured, edible oil spectral intensity to be measured is normalized; 2) to pretreated edible oil spectrum to be measured, extract the spectral intensity of benzopyrene characteristic wavelength, and spectral intensity is input in benzopyrene forecast model, benzo (a) the pyrene content that obtains sample is 8.9 μ g/kg.
More than show and described ultimate principle of the present utility model, principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; that in above-described embodiment and instructions, describes just illustrates principle of the present utility model; do not departing under the prerequisite of the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof
.
Claims (5)
1. the device based on conllinear dipulse LIBS technology fast detecting benzopyrene from edible oil content, comprises two pulsewidth solid state lasers, energy meter, catoptron, condenser lens, argon bottle, glassware, objective table, absorption sample carriers, the second condenser lens, spectrometer, ultramagnifier, data-carrier store and digit pulse delayer; It is characterized in that, two pulsewidth solid state lasers are connected with digit pulse delayer, and energy meter one end is connected with the laser beam that two pulsewidth solid state lasers produce, and the other end is connected with ultramagnifier, and digit pulse delayer is connected with spectrometer, ultramagnifier respectively; Catoptron is arranged on the laser beam rear end that two pulsewidth solid state lasers produce, and be positioned at the front end of condenser lens, objective table is arranged on the below of condenser lens, glassware is placed on objective table, and absorption sample carriers is placed in glassware, and argon bottle is arranged on glassware one side, and stretch in glassware, the second condenser lens is arranged on a side of absorption sample carriers top, and is connected with spectrometer, and data-carrier store is connected with spectrometer.
2. the device based on conllinear dipulse LIBS technology fast detecting benzopyrene from edible oil content according to claim 1, is characterized in that, data-carrier store comprises computing machine.
3. the device based on conllinear dipulse LIBS technology fast detecting benzopyrene from edible oil content according to claim 1, is characterized in that, absorption sample carriers comprises the filter paper layer that multi-layer filter paper forms.
4. the device based on conllinear dipulse LIBS technology fast detecting benzopyrene from edible oil content according to claim 1, is characterized in that, argon bottle stretches in glassware by conveyance conduit.
5. the device based on conllinear dipulse LIBS technology fast detecting benzopyrene from edible oil content according to claim 1, is characterized in that, the second condenser lens is connected with spectrometer by optical fiber.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104020143A (en) * | 2014-06-09 | 2014-09-03 | 江西农业大学 | Method for quickly detecting benzopyrene content of edible oil based on collinear double-pulse LIBS (Laser-induced Breakdown Spectroscopy) technique |
| CN104406942A (en) * | 2014-11-17 | 2015-03-11 | 浙江大学 | Multi-mode laser-induced breakdown spectroscopy device |
| CN104655595A (en) * | 2015-02-11 | 2015-05-27 | 北京农业智能装备技术研究中心 | Analysis system and analysis method of laser induced breakdown spectroscopy |
| CN105486676A (en) * | 2015-12-25 | 2016-04-13 | 中国科学院合肥物质科学研究院 | Microwave-assisted laser-induced breakdown spectrum device |
| CN107389657A (en) * | 2017-08-15 | 2017-11-24 | 江西农业大学 | Antiform oleic acid detection method of content and device in a kind of edible oil |
| CN108072635A (en) * | 2016-11-15 | 2018-05-25 | 中国科学院光电研究院 | A kind of method of ingredient in analytical equipment real-time online measuring Improving Glass Manufacturing Processes using Laser induced plasma spectroscopy |
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2014
- 2014-06-09 CN CN201420301798.9U patent/CN203894165U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104020143A (en) * | 2014-06-09 | 2014-09-03 | 江西农业大学 | Method for quickly detecting benzopyrene content of edible oil based on collinear double-pulse LIBS (Laser-induced Breakdown Spectroscopy) technique |
| CN104020143B (en) * | 2014-06-09 | 2017-01-18 | 江西农业大学 | Method for quickly detecting benzopyrene content of edible oil based on collinear double-pulse LIBS (Laser-induced Breakdown Spectroscopy) technique |
| CN104406942A (en) * | 2014-11-17 | 2015-03-11 | 浙江大学 | Multi-mode laser-induced breakdown spectroscopy device |
| CN104406942B (en) * | 2014-11-17 | 2017-07-21 | 浙江大学 | A kind of multi-mode laser induced breakdown spectroscopy device |
| CN104655595A (en) * | 2015-02-11 | 2015-05-27 | 北京农业智能装备技术研究中心 | Analysis system and analysis method of laser induced breakdown spectroscopy |
| CN104655595B (en) * | 2015-02-11 | 2017-06-20 | 北京农业智能装备技术研究中心 | The analysis system and method for LIBS |
| CN105486676A (en) * | 2015-12-25 | 2016-04-13 | 中国科学院合肥物质科学研究院 | Microwave-assisted laser-induced breakdown spectrum device |
| CN108072635A (en) * | 2016-11-15 | 2018-05-25 | 中国科学院光电研究院 | A kind of method of ingredient in analytical equipment real-time online measuring Improving Glass Manufacturing Processes using Laser induced plasma spectroscopy |
| CN107389657A (en) * | 2017-08-15 | 2017-11-24 | 江西农业大学 | Antiform oleic acid detection method of content and device in a kind of edible oil |
| CN107389657B (en) * | 2017-08-15 | 2019-12-17 | 江西农业大学 | Method and device for detecting content of trans-oleic acid in edible oil |
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