CN103472029B - A kind of pick-up unit for food additive component - Google Patents
A kind of pick-up unit for food additive component Download PDFInfo
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Abstract
For a pick-up unit for food additive component, comprise laser excitation unit, sample test unit, probe unit and signal processing unit.Wherein laser excitation unit is made up of laser instrument, the first diaphragm, optical filter, the first condenser lens, the second diaphragm, collimation lens and the second condenser lens; Sample test unit is made up of sample carrier and sample cell; Probe unit is a ultrasonic detector; Is signal processing unit by forward voltage amplifier, digital oscilloscope, GPIB-USB? I/O card and computing machine are formed.This device utilizes photic ultrasonic principle, fully optical detection and ultrasonic detecting technology is merged mutually, and largely eliminates the interference that tested tissue light scattering brings, and improves accuracy of detection.Compared with the pick-up units such as near infrared spectrum, apparatus of the present invention have the features such as accuracy of detection is high, applicability is strong.
Description
Technical field
The present invention relates to field of detection of food safety, 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, organic food enjoys consumer.Meanwhile, people also enhance safety and health care consciousness gradually, and food-safety problem more and more receives the concern of people.Food security is a transworld public health problem, not only the health existence of the direct relation mankind, but also drastically influence development that is economic and society.But along with development that is economic and science and technology, food security is not but ensured accordingly, a lot of food additives are still had to be present in our daily required food, and there is quite a few illegal additive level severe overweight, even occur that some adjuvants cannot carry out the difficult situation detected.Food additives are indispensable auxiliary materials in food industry, it can improve local flavor, regulates nutritional labeling, prevent food spoilage, thus raising quality, make processed food rich and varied, meet the various demands of consumer, but have some illegal retailer in order to make product reach cheap, 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 focus that the use of adjuvant and food security become government monitoring agencies, news media and common people pay close attention to.At present, the method measuring adjuvant has high performance liquid chromatography, vapor-phase chromatography, thin-layered chromatography, capillary electrophoresis etc.Although these traditional methods achieve certain effect, but they are all carry out destructiveness to food to detect, and need complicated sample pretreatment, cause detecting that stability is not high, cost intensive, and need the personnel possessing certain chemical analysis knowledge proper operation to complete.Some traditional lossless detection methods are also applied to food safety detection gradually, and representational method has: near, mid infrared absorption spectrum method, Raman spectroscopy and supersonic testing method etc.Although harmless detection fast can be realized, 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 constrain the spectral information relevant to food additives content greatly and measure, and make accuracy of measurement, degree of stability not high; For Raman spectroscopy, Raman scattering intensities is easily by 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 cannot effectively improves.
Summary of the invention
In order to overcome the deficiency of above-mentioned detection method, patent of the present invention proposes 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 is made up 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 is made up of Wavelength tunable pulsed laser.Described optical filter is made up of near infrared high pass or bandpass filter.
Described sample test unit is made up of sample carrier and sample cell from the bottom to top successively.
Described sample carrier is lifting table, can manually carry out up and down and horizontal level moves; 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 the food of liquid state, such as: various liquid beverage, without the need to carrying out pre-service to such testing sample, directly can put into sample cell and testing.
And for solid shape food, such as: biscuit, chocolate and various candy categories of food, only need to carry out simple pre-service to test sample, these food are first needed first to carry out pulverizing of milling, the distilled water getting a certain amount of powder certain capacity and temperature fully stirs and heats, after powdered food product fully dissolves, then suspension and other particulate contamination are fully filtered, the solution including additive component is loaded sample cell test after filtration; And for non-hydrophilic and non-solubization additive component, get the sample segment after dissolution filter again, 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 focus supersonic detector.
Described signal processing unit is electrically connected successively is formed by forward voltage amplifier (4-1), digital oscilloscope (4-2), GPIB-USBI/O card (4-3), computing machine (4-4).
A kind of pick-up unit for food additive component of the present invention, before using, in order to eliminate energy of lasers labile factor, laser instrument first start preheating in advance about 1 hour.After laser instrument completes preheating, instilled in sample cell by sample, then laser pulse repetition frequency is set to 20Hz, Energy transmission is first adjusted to about 50%, and output wavelength scope is adjusted to 1000-2500nm.Light beam sends from laser instrument, light source High frequency scattering light is eliminated through the first diaphragm, visible ray again after filtration beyond mating plate filtering near infrared, filtered light is through the first condenser lens, the optics 4F system that second diaphragm and collimation lens are formed, the light sent by laser instrument forms the parallel strips light beam of a standard, eventually pass the second condenser lens, the hot spot of incident laser is focused in the sample of sample cell, because tested food is to the absorption of incident light, make local energy depo, and produce volumetric expansion and then produce ultrasonic mechanical wave direction surrounding and spread out, after the focus detector being placed in sample cell outer wall catches the ultrasonic signal of these outside relaxation, convert the voltage signal of corresponding ultrasound intensity size to, after preposition voltage amplifier amplifies, amplifying signal collection is converted to digital signal by data oscillograph, send into computing machine by GPIBI/O digital card through GPIB-USB bus and carry out data storage and data analysis software carries out programmed process.
A kind of pick-up unit for food additive component of the present invention, compared 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, made accuracy of detection higher.
(2) due to the present invention's detection is the photic ultrasonic signal of food, although incidence is laser, but detection is but ultrasonic signal, therefore overcome the interference that the light scattering of food product component brings greatly, accuracy and the stability of measurement can be improved greatly.
(3) because the present invention adopts the pulsed laser of Wavelength tunable as excitation source, by length scanning, the different characteristic absorbing wavelength of different food products can be found, under avoiding single wavelength greatly, the applicability problem that different food products detects.
Accompanying drawing explanation
Fig. 1 is general structure principle schematic top plan view of the present invention.
Fig. 2 is the principle schematic of 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
Fig. 1 is the structure drawing of device of the present embodiment.Shown in figure, the name of each components and parts 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-USBI/O card (4-3), computing machine (4-4).The present invention is made up 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 paths direction, be made up of following components and parts 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) is made up of sample carrier (2-1) and sample cell (2-2).Probe unit (3) is ultrasonic detector.Signal processing unit (4) is electrically connected successively is formed by forward voltage amplifier (4-1), digital oscilloscope (4-2), GPIB-USBI/O card (4-3), computing machine (4-4).
Sample preparation: for the food of liquid state, such as: various liquid beverage, without the need to carrying out pre-service to such testing sample, directly can put into sample cell and testing.And for solid shape food, such as: biscuit, chocolate and various candy categories of food, only need to carry out simple pre-service to test sample, these food are first needed first to carry out pulverizing of milling, the distilled water getting a certain amount of powder certain capacity and temperature fully stirs and heats, after powdered food product fully dissolves, then suspension and other particulate contamination are fully filtered, the solution including additive component is loaded sample cell test after filtration; And for non-hydrophilic and non-solubization additive component, get the sample segment after dissolution filter again, 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 use, in order to eliminate energy of lasers labile factor, laser instrument (1-1) first start preheating in advance about 1 hour.After laser instrument (1-1) completes preheating, instilled by sample in sample cell (2-2), then the pulse repetition rate of laser instrument (1-1) is set to 20Hz, Energy transmission is first adjusted to about 50%, and output wavelength scope is adjusted to 1000-2400nm.Light beam sends from laser instrument (1-1), light source High frequency scattering light is eliminated through the first diaphragm (1-2), visible ray again after filtration beyond mating plate (1-3) filtering near infrared, filtered light is through the first condenser lens (1-4), the optics 4F system that second diaphragm (1-5) and collimation lens (1-6) are formed, the light that laser instrument (1-1) sends is formed the parallel strips light beam of a standard, eventually pass the second condenser lens (1-7), the hot spot of incident laser is focused in the sample of sample cell (2-2), because tested food is to the absorption of incident light, make local energy depo, and produce volumetric expansion and then produce ultrasonic mechanical wave direction surrounding and spread out, after the ultrasonic signal of these outside relaxation caught by the ultrasonic detector 3 being placed in sample cell (2-2) outer wall (as shown in Figure 2), convert the current signal of corresponding ultrasound intensity size to, after preposition voltage amplifier (4-1) amplifies, amplifying signal collection is converted to digital signal by digital oscilloscope (4-2), send into computing machine (4-4) by GPIB-USBI/O card (4-3) through GPIB-USB bus again and carry out data storage and data analysis software carries out programmed process.
Laser instrument (1-1) is the optical parametric oscillator (OpticalParametricOscillator of 532nm pumping source tune QNd:YAG, OPO) pulsed laser (OpoletteTM, 532 II, OpotekInc., CA), its Laser output output wavelength is that 680-2400nm is adjustable, whole wave band self-energy is not more than 10 MJs, nanosecond in duration of pulse 10, repetition frequency is that 1-20Hz is adjustable, export energy 0-100% adjustable, and in effective wavelength range, laser can export with 1-20nm adjustable sweep.Optical filter (1-3) is long wave flow-through near infrared filter (IPGC-720), and it is by visible reflectance, and by transmission of near infra red light.The optics 4F system that first condenser lens (1-4), the second diaphragm (1-5) and collimation lens (1-6) are formed, 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 is all 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, relative 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, and this oscillograph bandwidth 500MHz, the highest sampling rate is 2GSa/s.GPIB-USBI/O card (4-3) is I/O digital card (GPIB-USB-HS, NationalInstruments, 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, NationalInstruments, USA), it is for the data acquisition of programming software trigger oscillographic device, the operation such as peak-to-peak value parameter measurement and data autostore.
embodiment 2
As shown in Figure 1, when the pulse laser that laser excitation unit (1) of the present invention sends is incident to the sample in sample cell (2-2), produce photoacoustic source, and continually send ultrasonic signal ripple to surrounding, in order to reduce because of sample pool wall reflection ultrasonic echo superposition or mixing to the interference of supersonic sounding, the probe medical supersonic coupling liquid of ultrasonic detector (3) is smeared and is close to sample cell outer wall surface, is positioned at the opposite that laser excitation unit (1) sends laser direction simultaneously.
All the other are with embodiment 1.
embodiment 3
When laser instrument (1-1) energy is too large, the pulse laser sent is made to penetrate sample cell, portions incident laser is had to shine directly on the surface of ultrasonic detector (3), thus it is inaccurate to make ultrasonic signal measure, in order to avoid the problems referred to above, as shown in Figure 3, the detecting head surface of ultrasonic detector (3) is placed in sample cell side, the axial direction that ultrasonic detector (3) is popped one's head in and the incident laser optical axis that laser excitation unit (1) sends mutually orthogonal.
All the other are with embodiment 1.
Claims (1)
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, laser excitation unit (1) is made up 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 along the direction that light is propagated; Sample test unit (2) is made up of sample carrier (2-1) and sample cell (2-2); Signal processing unit (4) is electrically connected successively is formed by forward voltage amplifier (4-1), digital oscilloscope (4-2), GPIB-USBI/O card (4-3), computing machine (4-4); Described laser instrument (1-1) is short-pulse laser, its output wavelength and repetition frequency adjustable; Described optical filter (1-3) is by near infrared high pass or bandpass filter; Described sample cell (2-2) is quartz or glass material cuvette; Described probe unit (3) is a focus supersonic detector, during use, focus supersonic detector probe is close to sample cell outer wall, and uniform application medical supersonic coupling liquid between focus supersonic detector probe and sample cell outer wall.
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104034665B (en) * | 2014-06-06 | 2016-04-20 | 江西科技师范大学 | A kind of hand-hold food safety detection device and method |
| 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 |
| CN105486645B (en) * | 2014-11-13 | 2019-02-01 | 武汉境辉环保科技有限公司 | A kind of photoelectric sensor for the monitoring of liquid phase heavy metal |
| 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 |
| CN104807755B (en) * | 2015-04-23 | 2017-03-08 | 江西科技师范大学 | The quick photoacoustic detection device of Multi probe for food additive component and content and method |
| CN104880419B (en) * | 2015-06-08 | 2017-07-04 | 江西科技师范大学 | The food and medicine constituent content device for fast detecting and method of optoacoustic combination spectroscopic methodology |
| CN106052869B (en) * | 2016-05-18 | 2018-10-09 | 中国电子科技集团公司第四十一研究所 | A kind of infrared spectroradio meter based on gradual filter light splitting |
| 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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| CN102175775A (en) * | 2011-01-14 | 2011-09-07 | 河南工业大学 | Food quality testing system and method based on laser ultrasound erosion mechanism |
| CN102928346A (en) * | 2012-10-18 | 2013-02-13 | 中国科学院深圳先进技术研究院 | Dual-module imaging system |
| CN203519497U (en) * | 2013-09-25 | 2014-04-02 | 江西科技师范大学 | Photoacoustic device for rapidly detecting additives in liquid food |
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| US7367948B2 (en) * | 2002-08-29 | 2008-05-06 | The Regents Of The University Of Michigan | Acoustic monitoring method and system in laser-induced optical breakdown (LIOB) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175775A (en) * | 2011-01-14 | 2011-09-07 | 河南工业大学 | Food quality testing system and method based on laser ultrasound erosion mechanism |
| CN102928346A (en) * | 2012-10-18 | 2013-02-13 | 中国科学院深圳先进技术研究院 | Dual-module imaging system |
| CN203519497U (en) * | 2013-09-25 | 2014-04-02 | 江西科技师范大学 | Photoacoustic device for rapidly detecting additives in liquid food |
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