CN103472029A - Detection device used for food additive components - Google Patents
Detection device used for food additive components Download PDFInfo
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Abstract
The invention provides a detection device used for food additive components. The detection device comprises a laser excitation unit, a sample testing unit, a detection unit and a signal processing unit, wherein the laser excitation unit consists of a laser, a first diaphragm, an optical filter, a first focusing lens, a second diaphragm, a collimating lens and a second focusing lens; the sample testing unit consists of a sample bracket and a sample pool; the detection unit is an ultrasonic detector, and the signal processing unit consists of a prepositioned voltage amplifier, a digital oscilloscope, a GPIB-USBI/O (General Purpose Interface Bus-Universal Serial Bus Input/Output) card and a computer. According to the detection device, by utilizing the photoinduced ultrasonic principle, optical detection and ultrasonic detection technologies are sufficiently integrated, and the interference caused by detected tissue light scattering is greatly eliminated, so that the detection accuracy is improved. Compared with detection devices such as a near infrared spectrum, the detection device provided by the invention has the characteristics of high detection accuracy, strong applicability and the like.
Description
Technical field
The present invention relates to the food safety detection field, be specifically related to a kind of pick-up unit for food additive component.
Background technology
Along with expanding economy, the progress of science and technology, the improvement of human lives's condition, the favor nuisanceless, green, that organic food enjoys the consumer.Simultaneously, people have also strengthened safety and health care consciousness gradually, and food-safety problem more and more receives people's concern.Food security is a transworld public health problem, the not only direct relation mankind's health existence, but also having a strong impact on economical and social development.But along with economical and scientific and technological development, food security is not but guaranteed accordingly, still there are a lot of food additives to be present in our daily essential food, and quite a few illegal additive level severe overweight is arranged, the difficult situation that some adjuvants can't be detected even occurs.Food additives are indispensable auxiliary materials in food industry, it can improve local flavor, regulates nutritional labeling, prevent food spoilage, thereby raising quality, make to process food rich and varied, meet consumer's various demands, but some illegal retailer to be arranged product to reach cheap in order making, the abuse that looks good, smell good and taste good, the various food additives of Use out of range.The food-safety problem caused due to the Misuse of food additives in recent years emerges in an endless stream, and makes the use of adjuvant and food security become the focus that government regulation mechanism, news media and common people pay close attention to.At present, the method for mensuration adjuvant has high performance liquid chromatography, vapor-phase chromatography, thin-layered chromatography, capillary electrophoresis etc.Although these traditional methods have obtained certain effect, but they are all food to be carried out to destructiveness detect, and need complicated sample pretreatment, cause detecting that stability is not high, cost is expensive, and the personnel that need to possess certain chemical analysis knowledge could complete in proper operation.Some traditional lossless detection methods also are applied to food safety detection gradually, and representational method has: near, mid infrared absorption spectrum method, Raman spectroscopy and supersonic testing method etc.Although can realize harmless fast detecting, but near, mid infrared absorption spectrum method, because tested food easily produces light scattering to incident light, this point seems more outstanding for powdery and granule state food, these scattered lights have restricted greatly the spectral information relevant to food additives content and have measured, and make accuracy of measurement, degree of stability not high; For Raman spectroscopy, Raman scattering intensity easily is subject to the impact of the factors such as optical system parameter, and the component of testee itself is also larger on the impact of Raman spectrum simultaneously; And, for supersonic testing method, its spatial resolution is restricted and can't effectively improves.
Summary of the invention
In order to overcome the deficiency of above-mentioned detection method, patent of the present invention has proposed a kind of pick-up unit for food additive component.
Apparatus of the present invention comprise laser excitation unit, sample test unit, probe unit, signal processing unit.
Described laser excitation unit consists of laser instrument, the first diaphragm, optical filter, the first condenser lens, the second diaphragm, collimation lens and the second condenser lens successively along optical propagation direction.
Described laser instrument consists of the adjustable pulsed laser of wavelength.Described optical filter consists of near infrared high pass or bandpass filter.
Described sample test unit consists of sample carrier and sample cell from the bottom to top successively.
Described sample carrier is lifting table, can manually carry out upper and lower and horizontal level and move; Described sample cell is the cuvette container that quartz or glass material are made, and the base of cuvette is fixed on sample carrier.
Sample preparation:
For liquid food, such as: various liquid beverages, without such testing sample is carried out to pre-service, directly can put into sample cell and be tested.
And for solid shape food, such as: biscuit, chocolate and various candy categories of food, only need to carry out simple pre-service to specimen, first need the pulverizing of first being milled of these food, getting a certain amount of powder fully stirs and heats with the distilled water of certain capacity and temperature, after powdered food product fully dissolves, then suspension and other particulate contamination are fully filtered, the solution that includes additive component after the filtering sample cell of packing into is tested; And for non-water wettability and non-solubization additive component, get again the sample segment after dissolution filter, carry out dissolution extraction with conventional chemical reagent (as: ether, ethyl acetate, methylene chloride, chloroform, benzene), the solution after extraction reinstalls in sample cell to be tested.
Described probe unit is the focus supersonic detector.
Described signal processing unit is electrically connected formation successively by forward voltage amplifier (4-1), digital oscilloscope (4-2), GPIB-USB I/O card (4-3), computing machine (4-4).
A kind of pick-up unit for food additive component of the present invention, before use, in order to eliminate the energy of lasers labile factor, the laser instrument preheating approximately 1 hour of first starting shooting in advance.After laser instrument completes preheating, sample is splashed in sample cell, then the laser pulse repetition frequency is made as to 20Hz, energy output first is adjusted to approximately 50%, and the output wavelength scope is adjusted to 1000-2500nm.Light beam sends from laser instrument, eliminate light source High frequency scattering light through the first diaphragm, visible ray beyond mating plate filtering near infrared after filtration again, filtered light is through the first condenser lens, the optics 4F system that the second diaphragm and collimation lens form, the light that laser instrument is sent forms the parallel beams of narrow-band light of a standard, finally by crossing the second condenser lens, the hot spot of incident laser is focused in the sample of sample cell, due to the absorption of tested food to incident light, make the local energy deposition, and produce volumetric expansion and then produce ultrasonic mechanical wave direction surrounding and spread out, after the focus detector that is placed in the sample cell outer wall is caught the ultrasonic signal of these outside relaxation, convert the voltage signal of corresponding ultrasound intensity size to, after preposition voltage amplifier amplifies, by the data oscillograph by the amplifying signal collection and convert digital signal to, sent into through the GPIB-USB bus by GPIB I/O digital card that computing machine carries out the data storage and data analysis software is carried out programmed process.
A kind of pick-up unit for food additive component of the present invention, compare with other technologies, has following useful effect:
(1) because the present invention adopts photoacoustic detection technique, had the advantage of pure optical detective technology high resolving power and pure ultrasonic detecting technology high-contrast concurrently, make accuracy of detection higher.
(2) what survey due to the present invention is the photic ultrasonic signal of food, although incident is laser, but what survey is but ultrasonic signal, therefore overcome greatly the interference that the light scattering of food internal composition brings, can improve greatly accuracy and the stability of measurement.
(3) because the present invention adopts the adjustable pulsed laser of wavelength as excitation source, by length scanning, can find the different characteristic absorbing wavelength of different food products, avoided greatly under single wavelength the applicability problem that different food products detects.
The accompanying drawing explanation
Fig. 1 is general structure principle schematic top plan view of the present invention.
The principle schematic that Fig. 2 is test cell of the present invention.
Fig. 3 is probe unit scheme two schematic diagram of the present invention.
Embodiment
embodiment 1device of the present invention
The structure drawing of device that Fig. 1 is the present embodiment.The name of each components and parts shown in figure is called: laser generator (1-1), the first diaphragm (1-2), optical filter (1-3), the first condenser lens (1-4), the second diaphragm (1-5), collimation lens (1-6), the second condenser lens (1-7), sample carrier (2-1) and sample cell (2-2), ultrasonic detector (3), forward voltage amplifier (4-1), digital oscilloscope (4-2), GPIB-USB I/O card (4-3), computing machine (4-4).The present invention consists of laser excitation unit (1), sample test unit (2), probe unit (3) and signal processing unit (4).As shown in Figure 1, wherein laser excitation unit (1) is along the light path direction of propagation, by following components and parts, formed successively, that is: laser instrument (1-1), the first diaphragm (1-2), optical filter (1-3), the first condenser lens (1-4), the second diaphragm (1-5), collimation lens (1-6), the second condenser lens (1-7).Sample test unit (2) consists of sample carrier (2-1) and sample cell (2-2).Probe unit (3) is ultrasonic detector.Signal processing unit (4) is electrically connected formation successively by forward voltage amplifier (4-1), digital oscilloscope (4-2), GPIB-USB I/O card (4-3), computing machine (4-4).
Sample preparation: for liquid food, such as: various liquid beverages, without such testing sample is carried out to pre-service, directly can put into sample cell and be tested.And for solid shape food, such as: biscuit, chocolate and various candy categories of food, only need to carry out simple pre-service to specimen, first need the pulverizing of first being milled of these food, getting a certain amount of powder fully stirs and heats with the distilled water of certain capacity and temperature, after powdered food product fully dissolves, then suspension and other particulate contamination are fully filtered, the solution that includes additive component after the filtering sample cell of packing into is tested; And for non-water wettability and non-solubization additive component, get again the sample segment after dissolution filter, carry out dissolution extraction with conventional chemical reagent (as: ether, ethyl acetate, methylene chloride, chloroform, benzene), the solution after extraction reinstalls in sample cell to be tested.
Before apparatus of the present invention are used, in order to eliminate the energy of lasers labile factor, laser instrument (1-1) preheating approximately 1 hour of first starting shooting in advance.After laser instrument (1-1) completes preheating, sample is splashed in sample cell (2-2), then the pulse repetition rate of laser instrument (1-1) is made as to 20Hz, energy output first is adjusted to approximately 50%, and the output wavelength scope is adjusted to 1000-2400nm.Light beam sends from laser instrument (1-1), eliminate light source High frequency scattering light through the first diaphragm (1-2), visible ray beyond mating plate (1-3) filtering near infrared after filtration again, filtered light is through the first condenser lens (1-4), the optics 4F system that the second diaphragm (1-5) and collimation lens (1-6) form, the light that laser instrument (1-1) is sent forms the parallel beams of narrow-band light of a standard, finally by crossing the second condenser lens (1-7), the hot spot of incident laser is focused in the sample of sample cell (2-2), due to the absorption of tested food to incident light, make the local energy deposition, and produce volumetric expansion and then produce ultrasonic mechanical wave direction surrounding and spread out, the ultrasonic detector 3 that is placed in sample cell (2-2) outer wall is caught (as shown in Figure 2) after the ultrasonic signal of these outside relaxation, convert the current signal of corresponding ultrasound intensity size to, after preposition voltage amplifier (4-1) amplifies, by digital oscilloscope (4-2) by the amplifying signal collection and convert digital signal to, sent into through the GPIB-USB bus by GPIB-USB I/O card (4-3) again that computing machine (4-4) carries out the data storage and data analysis software is carried out programmed process.
Laser instrument (1-1) is optical parametric oscillator (the Optical Parametric Oscillator of 532nm pumping source tune Q Nd:YAG, OPO) pulsed laser (OpoletteTM, 532 II, Opotek Inc., CA), its Laser output output wavelength is that 680-2400nm is adjustable, it is burnt that whole wave band self-energy is not more than 10 millis, 10 nanoseconds of duration of pulse, repetition frequency is that 1-20Hz is adjustable, 0-100% is adjustable for the output energy, and, in effective wavelength range, laser can be with the adjustable scanning output of 1-20nm.Optical filter (1-3) is long wave flow-through near infrared filter (IPGC-720), and it reflects visible ray, and by transmission of near infra red light.The optics 4F system that the first condenser lens (1-4), the second diaphragm (1-5) and collimation lens (1-6) form, diaphragm (1-5) is positioned at the front focal plane place of the first condenser lens (1-4) back focal plane and collimation lens (1-6), and the focal length of the first condenser lens (1-4) and collimation lens all is about 10 centimetres.The focal length of the second condenser lens (1-7) is about 2 centimetres.
Sample cell (2-2) is quartz colorimetric utensil, and optical length is about 10mm.Ultrasonic detector (3) is piezoceramic material focus supersonic detector (I1P10NF40, Doppler, China), this ultrasonic detector center response frequency 9.52MHz, relatively echo sensitivity is-29.32db, focal range between 34-46mm, damping 50 Ω.Forward voltage amplifier (4-1) is Japanese Olympus 5678, and the gain amplifier of this amplifier is 40dB, and bandwidth is 50k-40MHz.Digital oscilloscope (4-2) is two-channel digital oscillograph (54642D, Agilent, USA), and it is for triggering single-point or continuous acquisition optoacoustic electric signal, this oscillograph bandwidth 500MHz, and the highest sampling rate is 2GSa/s.GPIB-USB I/O card (4-3) is I/O digital card (GPIB-USB-HS, National Instruments, USA), and it is for connecting digital oscilloscope (4-2) and computing machine (4-4), for the high-speed transfer of sampled data.Data analysis software is LabVIEW(Version.8.0, National Instruments, USA), it triggers the operations such as oscillographic data acquisition, peak-to-peak value parameter measurement and data autostore for programming software.
As shown in Figure 1, when the pulse laser that laser excitation of the present invention unit (1) sends is incident to the sample in sample cell (2-2), produce photoacoustic source, and continually to surrounding, send the ultrasonic signal ripple, in order to reduce because of the ultrasonic echo stack of sample pool wall reflection or the mixing interference to supersonic sounding, the probe of ultrasonic detector (3) is smeared and is close to the sample cell outer wall surface by the medical supersonic coupling liquid, is positioned at the opposite that laser excitation unit (1) sends laser direction simultaneously.
All the other are with embodiment 1.
When laser instrument (1-1) energy too large, make the pulse laser sent penetrate sample cell, there is the part incident laser to shine directly on the surface of ultrasonic detector (3), thereby it is inaccurate to make ultrasonic signal measure, for fear of the problems referred to above, as shown in Figure 3, the detecting head surface of ultrasonic detector (3) is placed in to the sample cell side, the incident laser optical axis that send the axial direction of ultrasonic detector (3) probe and laser excitation unit (1) is mutually orthogonal.
All the other are with embodiment 1.
Claims (5)
1. the pick-up unit for food additive component, comprise laser excitation unit (1), sample test unit (2), probe unit (3) and signal processing unit (4), it is characterized in that, the direction that propagate along light laser excitation unit (1) consists of laser instrument (1-1), the first diaphragm (1-2), optical filter (1-3), the first condenser lens (1-4), the second diaphragm (1-5), collimation lens (1-6), the second condenser lens (1-7) successively; Sample test unit (2) consists of sample carrier (2-1) and sample cell (2-2); Signal processing unit (4) is electrically connected formation successively by forward voltage amplifier (4-1), digital oscilloscope (4-2), GPIB-USB I/O card (4-3), computing machine (4-4).
2. a kind of pick-up unit for food additive component according to claim 1, it is characterized in that: described laser instrument (1-1) is short-pulse laser, and its output wavelength and repetition frequency are adjustable.
3. a kind of pick-up unit for food additive component according to claim 1, it is characterized in that: described optical filter (1-3) is by near infrared high pass or bandpass filter.
4. a kind of pick-up unit for food additive component according to claim 1, it is characterized in that: described sample cell (2-2) is quartz or glass material cuvette.
5. a kind of pick-up unit for food additive component according to claim 1, it is characterized in that: described probe unit (3) is a focus supersonic detector, during use, the focus supersonic detector probe is close to the sample cell outer wall, and evenly smears the medical supersonic coupling liquid between focus supersonic detector probe and sample cell outer wall.
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Cited By (9)
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| CN104034666A (en) * | 2014-06-13 | 2014-09-10 | 江西科技师范大学 | Graded and fast detection device and method for quality of foods and medicines |
| CN104034665A (en) * | 2014-06-06 | 2014-09-10 | 江西科技师范大学 | Handheld food safety detection device and method |
| CN104697932A (en) * | 2015-03-03 | 2015-06-10 | 江西科技师范大学 | Portable rapid food and drug quality detection device and method |
| CN104807755A (en) * | 2015-04-23 | 2015-07-29 | 江西科技师范大学 | Multi-probe rapid photoacoustic detection apparatus for detecting components and contents of food additives and detecting method |
| CN104880419A (en) * | 2015-06-08 | 2015-09-02 | 江西科技师范大学 | Photoacoustic combined spectroscopy food and medicine ingredient content fast detection device and method |
| CN105486645A (en) * | 2014-11-13 | 2016-04-13 | 武汉境辉环保科技有限公司 | Photoelectric sensor used for monitoring liquid phase heavy metals |
| CN106052869A (en) * | 2016-05-18 | 2016-10-26 | 中国电子科技集团公司第四十研究所 | Infrared spectroradiometer based on light splitting of gradual filter |
| CN111189985A (en) * | 2020-03-03 | 2020-05-22 | 上蔡县状元红食品质量检测服务有限公司 | Food nutrient content detection device |
| CN111307720A (en) * | 2020-04-10 | 2020-06-19 | 黄淮学院 | Food additive component detection device and use method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104034665A (en) * | 2014-06-06 | 2014-09-10 | 江西科技师范大学 | Handheld food safety detection device and method |
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| CN106052869A (en) * | 2016-05-18 | 2016-10-26 | 中国电子科技集团公司第四十研究所 | Infrared spectroradiometer based on light splitting of gradual filter |
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| CN111189985A (en) * | 2020-03-03 | 2020-05-22 | 上蔡县状元红食品质量检测服务有限公司 | Food nutrient content detection device |
| CN111189985B (en) * | 2020-03-03 | 2022-05-31 | 上蔡县状元红食品质量检测服务有限公司 | Food nutrient content detection device |
| CN111307720A (en) * | 2020-04-10 | 2020-06-19 | 黄淮学院 | Food additive component detection device and use method |
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