CN203643328U - Edible oil detection device based on photo-thermal absorbing spectrum technique - Google Patents
Edible oil detection device based on photo-thermal absorbing spectrum technique Download PDFInfo
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- CN203643328U CN203643328U CN201320867416.4U CN201320867416U CN203643328U CN 203643328 U CN203643328 U CN 203643328U CN 201320867416 U CN201320867416 U CN 201320867416U CN 203643328 U CN203643328 U CN 203643328U
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- 239000008157 edible vegetable oil Substances 0.000 title claims abstract description 63
- 238000001514 detection method Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000001228 spectrum Methods 0.000 title abstract 2
- 238000001914 filtration Methods 0.000 claims abstract description 9
- 239000000523 sample Substances 0.000 claims description 47
- 238000004847 absorption spectroscopy Methods 0.000 claims description 14
- 238000012360 testing method Methods 0.000 claims description 13
- 238000005086 pumping Methods 0.000 claims description 10
- 230000003287 optical effect Effects 0.000 claims description 8
- 230000031700 light absorption Effects 0.000 claims description 4
- 230000035945 sensitivity Effects 0.000 abstract description 6
- 239000012535 impurity Substances 0.000 abstract description 4
- 238000010521 absorption reaction Methods 0.000 description 13
- 238000000862 absorption spectrum Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 239000003921 oil Substances 0.000 description 8
- 235000019198 oils Nutrition 0.000 description 8
- 238000001069 Raman spectroscopy Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 241000196324 Embryophyta Species 0.000 description 3
- 235000014113 dietary fatty acids Nutrition 0.000 description 3
- 229930195729 fatty acid Natural products 0.000 description 3
- 239000000194 fatty acid Substances 0.000 description 3
- 150000004665 fatty acids Chemical class 0.000 description 3
- 229910001385 heavy metal Inorganic materials 0.000 description 3
- 238000002798 spectrophotometry method Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- HGINCPLSRVDWNT-UHFFFAOYSA-N Acrolein Chemical compound C=CC=O HGINCPLSRVDWNT-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- IPCSVZSSVZVIGE-UHFFFAOYSA-N hexadecanoic acid Chemical compound CCCCCCCCCCCCCCCC(O)=O IPCSVZSSVZVIGE-UHFFFAOYSA-N 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000003053 toxin Substances 0.000 description 2
- 231100000765 toxin Toxicity 0.000 description 2
- 235000015112 vegetable and seed oil Nutrition 0.000 description 2
- 239000008158 vegetable oil Substances 0.000 description 2
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 1
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 1
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 1
- 229930195730 Aflatoxin Natural products 0.000 description 1
- XWIYFDMXXLINPU-UHFFFAOYSA-N Aflatoxin G Chemical compound O=C1OCCC2=C1C(=O)OC1=C2C(OC)=CC2=C1C1C=COC1O2 XWIYFDMXXLINPU-UHFFFAOYSA-N 0.000 description 1
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 1
- 239000005642 Oleic acid Substances 0.000 description 1
- 235000021314 Palmitic acid Nutrition 0.000 description 1
- 235000019483 Peanut oil Nutrition 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 235000019486 Sunflower oil Nutrition 0.000 description 1
- 239000005409 aflatoxin Substances 0.000 description 1
- -1 after detecting Substances 0.000 description 1
- 235000021120 animal protein Nutrition 0.000 description 1
- 244000052616 bacterial pathogen Species 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 235000021393 food security Nutrition 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- WQEPLUUGTLDZJY-UHFFFAOYSA-N n-Pentadecanoic acid Natural products CCCCCCCCCCCCCCC(O)=O WQEPLUUGTLDZJY-UHFFFAOYSA-N 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 1
- 235000021313 oleic acid Nutrition 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 239000000312 peanut oil Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 239000002600 sunflower oil Substances 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Abstract
The utility model provides an edible oil detection device based on a photo-thermal absorbing spectrum technique. The device comprises a pump light source, a detection light source, a pump light modulation device, a pump light convergence device, a first detection light convergence device, a beam combining device, a tested edible oil sample tank, a beam splitting device, a pump light absorbing device, a second detection light convergence device, a detection light filtering device, a spatial filter, a photoelectric detector and an alternative current weak signal detection device. By adopting the device, the influence of scattering on a detection result is avoided, the detection result is reliable, and the device is very high in detection sensitivity to light absorptivity, and can be applied to detection under the condition that the edible oil contains a small quantity of impurity components.
Description
Technical field
The utility model relates to oil product detection and identification technical field, specifically a kind of edible oil detecting device based on photo-thermal absorption spectroscopy techniques.
Background technology
Food security, is related to everyone life and health, is the most important thing.Thereby the demand of detection and identification technology to varieties of food items safety is also very urgent.All kinds of edible oils are the requisite necessitys of people's daily life.But in recent years, some illegal operators are in order to reap staggering profits, pretend to be qualified edible oil with trench wet goods poor oil.In waste oil, contain a large amount of objectionable impuritiess, serious harm people's health.Therefore, can carry out quickly and efficiently the detection and identification of edible oil quality, just have very important meaning.
Because oil with common edible and adulterated edible oil are different on composition, adulterated edible oil the inside, often heavy metal, toxin (such as acryl aldehyde, aflatoxin etc.) severe overweight, this also makes oil with common edible compare with mixed edible oil, some physical parameters are also different, as optical absorptivity, refractive index etc.Conventional oil product detection technique has stratographic analysis and spectrographic method.In chromatogram analysis method, need to carry out certain processing to sample to be measured, testing process more complicated, does not meet the requirement of fast detecting yet.And the method has changed the formation of sample, after detecting, sample cannot recycle.Common spectroscopic analysis methods has spectrophotometric method, Raman spectroscopy etc., but these methods have deficiency.In spectrophotometric method, normally directly measure the variation of the light intensity that sees through sample, then obtain absorptivity and the absorption spectrum of sample according to lambert Bill (Lambert-Beer) law.This method, in the time that weak absorption sample is detected, can produce larger error, and main source of error is that sample surfaces and sample interior are to scattering of light, such as impurity contained in edible oil inferior etc.Because within the light intensity that this part scattering causes variation tends to be calculated in absorption, in the time that absorption of sample is very weak, this can cause larger detection error.Raman spectroscopy is that the Raman scattering effect by sample molecule is caused detects, thereby obtains the architectural feature about sample molecule.Different raman signatures spectral line corresponding to molecular structure.But the efficiency of Raman scattering itself is very low, scattered light is also very weak, like this in sample impurity component smaller in, the sensitivity of detection also can be received very large restriction.
Utility model content
The purpose of this utility model is to provide the edible oil detecting device based on photo-thermal absorption spectroscopy techniques that a kind of measurement result is reliable, detection sensitivity is high, is realized the quality of edible oil is carried out to detection and identification by this pick-up unit.
The technical solution of the utility model is:
A kind of edible oil detecting device based on photo-thermal absorption spectroscopy techniques, comprise the pump light source that is connected by beam merging apparatus light path with edible oil sample pond respectively and probe source and the pump light absorption plant and the photodetector that are connected by beam splitting arrangement light path with edible oil sample pond respectively, between described pump light source and beam merging apparatus, be provided with successively pump light modulating device and pump light convergence apparatus, between described probe source and beam merging apparatus, be provided with and survey light the first convergence apparatus, between described beam splitting arrangement and photodetector, be provided with successively and survey light the second convergence apparatus, survey light filtering apparatus and spatial filter, the output terminal of described photodetector is connected with the input end that exchanges Testing of Feeble Signals device.
The described edible oil detecting device based on photo-thermal absorption spectroscopy techniques, is provided with between described detection light the first convergence apparatus and beam merging apparatus and surveys light angular adjustment apparatus.
The described edible oil detecting device based on photo-thermal absorption spectroscopy techniques, is provided with pump light light-dividing device between described pump light modulating device and pump light convergence apparatus, and the reflected light path of described pump light light-dividing device is provided with pumping light power sniffer.
The described edible oil detecting device based on photo-thermal absorption spectroscopy techniques, is provided with between described detection light filtering apparatus and spatial filter and surveys light light-dividing device, and the reflected light path of described detection light light-dividing device is provided with detection of optical power sniffer.
The described edible oil detecting device based on photo-thermal absorption spectroscopy techniques, described interchange Testing of Feeble Signals device is selected lock-in amplifier
The utility model utilizes photo-thermal effect to measure the photo-thermal absorption spectrum of edible oil sample, the characteristic of the edible oil sample that pump light induction produces changes, be because edible oil sample absorptive pumping luminous energy causes, therefore, the measured signal of photodetector only reflects the absorption characteristic of edible oil sample, and edible oil sample surface and inner scattering do not exert an influence to measurement result.The utility model has been eliminated the impact of scattering on measurement result, and measurement result is more reliable; The utility model is high to the detection sensitivity of absorptivity, can reach 10
-8, be greatly better than adopting that spectrophotometric method reaches 10
-5～10
-6detection sensitivity, the in the situation that impurity component being few in edible oil, also can realize detection.
Accompanying drawing explanation
Fig. 1 is apparatus structure schematic diagram of the present utility model.
Embodiment
Further illustrate the utility model below in conjunction with the drawings and specific embodiments.
It is as follows that the utility model utilizes photo-thermal absorption spectrum to carry out the theoretical foundation of edible oil detection: common edible oil mostly is vegetable oil, and principal ingredient is the fatty acid such as palmitic acid, stearic acid, oleic acid.Composition and the content of its fatty acid of vegetable oil of different qualities are also different, therefore its absorption spectrum is also different, for example, at ultraviolet band, sunflower oil has 280.4nm, 269.6nm, 259.4nm and tetra-absorption peaks of 230.6nm, peanut oil has 279.8nm, two absorption peaks of 269.2nm, and the position of the absorption peak of the edible oil of other quality is also different; Have again, at infrared band, the edible oil of variety classes, different qualities, although the position of its absorption peak is basic identical, because the content difference of all kinds of fatty acid wherein, therefore the size of its absorption peak is different.In addition, common waste oil is mainly derived from: the greasy thing that sewer is floating or the swill of used by hotels and restaurants by, the fat of the animal that goods of inferior quality carries the germs of a disease, processes through simple refinement, in waste oil, can contain a large amount of heavy metals, toxin and animal protein etc.The optical absorption characteristic of these materials is also different, and for example, heavy metal element lead has significant Absorption Characteristics at 217nm and 283.3nm, and cadmium has significant Absorption Characteristics at 228.8nm and 326.2nm place.Therefore, under different qualities, the absorption spectrum of edible oil is also different.By the absorption spectrum of Various Edible is measured to comparison, just can realize the detection and identification of edible oil quality.
As shown in Figure 1, a kind of edible oil detecting device based on photo-thermal absorption spectroscopy techniques, comprise pump light source 1, pump light modulating device 2, pump light light-dividing device 3, pumping light power sniffer 4, pump light convergence apparatus 5, beam merging apparatus 6, tested edible oil sample pond 7, pump light absorption plant 8, probe source 9, survey light the first convergence apparatus 10, survey light angular adjustment apparatus 11, beam splitting arrangement 12, survey light the second convergence apparatus 13, survey light filtering apparatus 14, survey light light-dividing device 15, detection of optical power sniffer 16, spatial filter 17, photodetector 18 with exchange Testing of Feeble Signals device 19.
Pump light modulating device 2 can adopt photomodulator or chopper, pump light light-dividing device 3 and detection light light-dividing device 15 can adopt light splitting piece or Amici prism, pumping light power sniffer 4 and detection of optical power sniffer 16 can adopt power meter or power detector, pump light convergence apparatus 5, survey light the first convergence apparatus 10 and survey light the second convergence apparatus 13 and can adopt condenser lens, beam merging apparatus 6 can adopt dichroic mirror or light splitting piece, survey light angular adjustment apparatus 11 and can adopt high reflection mirror, beam splitting arrangement 12 can adopt light splitting piece or Amici prism, survey light filtering apparatus 14 and can adopt optical filter, exchange Testing of Feeble Signals device 19 and can adopt lock-in amplifier.
The pump beam being sent by pump light source 1 is after pump light modulating device 2, its light intensity is modulated, pump beam after modulation is divided into two bundles through pump light light-dividing device 3, wherein a branch of pumping light power sniffer 4 that enters into, for the power of pump light is monitored, another Shu Ze is focused on by pump light convergence apparatus 5 and after beam merging apparatus 6, is irradiated in tested edible oil sample pond 7, for exciting light thermal effect, absorbed by pump light absorption plant 8 through the remaining pump beam in tested edible oil sample pond 7.
The detecting light beam being sent by probe source 9 is successively through surveying light the first convergence apparatus 10, survey after light angular adjustment apparatus 11 and beam merging apparatus 6, also be irradiated in tested edible oil sample pond 7, with the light-struck area coincidence of pumping, the detecting light beam that sees through tested edible oil sample pond 7 passes through beam splitting arrangement 12 successively, survey light the second convergence apparatus 13, filter again the parasitic light of other wave band except surveying light through surveying light filtering apparatus 14, be divided into two bundles through the detecting light beam of surveying light filtering apparatus 14 by surveying light light-dividing device 15, wherein a branch of detection of optical power sniffer 16 that enters into, for the power of surveying light is monitored, another Shu Ze is surveyed by photodetector 18 after spatial filter 17, the light signal of detection is changed into electric signal by photodetector 18, input AC Testing of Feeble Signals device 19 detects, pass through again follow-up data analysis processing, obtain the absorption spectrum of tested edible oil sample.
Principle of work of the present utility model:
A branch of stronger pump light is irradiated in tested edible oil sample pond 7 and is interacted with tested edible oil sample after ovennodulation, tested edible oil sample raises because absorptive pumping luminous energy causes local temperature, thereby the local physical property that causes tested edible oil sample changes, this phenomenon is also referred to as photo-thermal effect.Photo-thermal effect is relevant to the size of the absorptivity of tested edible oil sample, absorbs greatlyr, and photo-thermal effect is also just more remarkable.The irradiation area through pump light in tested edible oil sample by a branch of weak detection light again, because pump light excites the photo-thermal effect of generation in this region, the propagation characteristic of the detecting light beam in this region of process can change, and produces newly-increased convergence or effect weakening.The variation of detecting light beam propagation characteristic can detect and obtains by being arranged on spatial filter 17 the detection light path of tested edible oil sample pond 7 outgoing and photodetector 18.Spatial filter 17 allows part to survey luminous energy and enters photodetector 18, because photo-thermal effect causes that surveying light produces newly-increased convergence or disperse, will there is corresponding variation in the detection luminous energy that enters into photodetector 18 through spatial filter 17 like this, because the variable quantity of detecting light beam propagation characteristic is often smaller, even be less than the noise fluctuations of detecting light beam itself, therefore generally need to utilize interchange Testing of Feeble Signals device to detect, conventional interchange Testing of Feeble Signals device has lock-in amplifier etc., while adopting lock-in amplifier to detect, to pumping laser light beam be carried out to the frequency modulating signal of intensity modulation as the reference signal frequency of lock-in amplifier, can greatly suppress like this noise and the external environmental noise etc. of detecting light beam itself to the impact of measurement result, reach very high detection sensitivity, the frequency of modulation signal is unsuitable too high, can eliminate like this impact of the thermophysical property of tested edible oil sample on testing result own.
In the situation that testing conditions is constant, the detected detection light signal of photodetector 18 is only originally relevant in the absorption characteristic of pump light wave band with tested edible oil sample, therefore, the size of the detected detection Photothermal Signals of photodetector 18 directly reflects the size of the absorptivity of tested edible oil sample.The electric signal that photodetector 18 is exported is fainter, utilizes phase-locked detection technique to amplify, then after suitable calibration is processed, just can change into the absorptivity information of tested edible oil sample.Change pumping light wavelength, repeat above testing process, just can obtain the size of the absorptivity of tested edible oil sample under different wave length, thereby obtain the photo-thermal absorption spectrum of tested edible oil sample.Because composition and the content of the edible oil of different qualities are different, therefore their photo-thermal absorption spectrum is also different, measures comparison by the photo-thermal absorption spectrum to tested edible oil sample, can be to they discriminatings of classifying.
The above embodiment is only that preferred implementation of the present utility model is described; not scope of the present utility model is limited; do not departing under the prerequisite of the utility model design spirit; various distortion and improvement that those of ordinary skills make the technical solution of the utility model, all should fall in the definite protection domain of claims of the present utility model.
Claims (5)
1. the edible oil detecting device based on photo-thermal absorption spectroscopy techniques, it is characterized in that: comprise the pump light source that is connected by beam merging apparatus light path with tested edible oil sample pond respectively and probe source and the pump light absorption plant and the photodetector that are connected by beam splitting arrangement light path with tested edible oil sample pond respectively, between described pump light source and beam merging apparatus, be provided with successively pump light modulating device and pump light convergence apparatus, between described probe source and beam merging apparatus, be provided with and survey light the first convergence apparatus, between described beam splitting arrangement and photodetector, be provided with successively and survey light the second convergence apparatus, survey light filtering apparatus and spatial filter, the output terminal of described photodetector is connected with the input end that exchanges Testing of Feeble Signals device.
2. the edible oil detecting device based on photo-thermal absorption spectroscopy techniques according to claim 1, is characterized in that: between described detection light the first convergence apparatus and beam merging apparatus, be provided with and survey light angular adjustment apparatus.
3. the edible oil detecting device based on photo-thermal absorption spectroscopy techniques according to claim 1, it is characterized in that: between described pump light modulating device and pump light convergence apparatus, be provided with pump light light-dividing device, the reflected light path of described pump light light-dividing device is provided with pumping light power sniffer.
4. the edible oil detecting device based on photo-thermal absorption spectroscopy techniques according to claim 1, it is characterized in that: between described detection light filtering apparatus and spatial filter, be provided with and survey light light-dividing device, the reflected light path of described detection light light-dividing device is provided with detection of optical power sniffer.
5. the edible oil detecting device based on photo-thermal absorption spectroscopy techniques according to claim 1, is characterized in that: described interchange Testing of Feeble Signals device is selected lock-in amplifier.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320867416.4U CN203643328U (en) | 2013-12-26 | 2013-12-26 | Edible oil detection device based on photo-thermal absorbing spectrum technique |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320867416.4U CN203643328U (en) | 2013-12-26 | 2013-12-26 | Edible oil detection device based on photo-thermal absorbing spectrum technique |
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| CN203643328U true CN203643328U (en) | 2014-06-11 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103712949A (en) * | 2013-12-26 | 2014-04-09 | 无锡利弗莫尔仪器有限公司 | Photo-thermal absorption spectrum technology-based cooking oil detection method and photo-thermal absorption spectrum technology-based cooling oil detection device |
| CN104749135A (en) * | 2015-03-31 | 2015-07-01 | 中国科学院物理研究所 | Intermediate infrared spectrometer |
| CN105717127A (en) * | 2016-02-05 | 2016-06-29 | 中国工程物理研究院激光聚变研究中心 | Photo-thermal weak absorption testing device and method |
-
2013
- 2013-12-26 CN CN201320867416.4U patent/CN203643328U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103712949A (en) * | 2013-12-26 | 2014-04-09 | 无锡利弗莫尔仪器有限公司 | Photo-thermal absorption spectrum technology-based cooking oil detection method and photo-thermal absorption spectrum technology-based cooling oil detection device |
| CN104749135A (en) * | 2015-03-31 | 2015-07-01 | 中国科学院物理研究所 | Intermediate infrared spectrometer |
| CN105717127A (en) * | 2016-02-05 | 2016-06-29 | 中国工程物理研究院激光聚变研究中心 | Photo-thermal weak absorption testing device and method |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140611 |