CN101881838A - Electromagnetic sensor based measuring equipment and method of dangerous goods in food - Google Patents
Electromagnetic sensor based measuring equipment and method of dangerous goods in food Download PDFInfo
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- CN101881838A CN101881838A CN 201010207028 CN201010207028A CN101881838A CN 101881838 A CN101881838 A CN 101881838A CN 201010207028 CN201010207028 CN 201010207028 CN 201010207028 A CN201010207028 A CN 201010207028A CN 101881838 A CN101881838 A CN 101881838A
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Abstract
The invention belongs to the technical field of electromagnetic sensors, and relates to electromagnetic sensor based measuring equipment of dangerous goods in food, comprising an electromagnetic sensor and a mutual inductance measuring instrument. The electromagnetic sensor comprises three parallel and coaxial coils, wherein two coils at the outer side are receiving coils, one ends of the two coils are mutually connected, the other ends of the two coils are respectively used as receiving ends to form a difference structure, and the coil in the middle is an excitation coil. Two terminals of the excitation coil are connected with the excitation end of the mutual inductance measuring instrument, and the terminals of the receiving coils are connected with the receiving end of the mutual inductance measuring instrument. Whether metal dangerous goods exists inside a food to be tested or not is judged by determining whether the ratio of the difference of a calibration inductance value and a corresponding measuring inductance value and the calibration inductance value is greater than a preset threshold value or not. The invention also provides a method for detecting whether metal dangerous goods exists in the food or not by adopting the measuring equipment. The invention has the advantages of simple structure, low cost, sensitive detection, quickness and efficiency.
Description
Technical field
The invention belongs to the electromagnetic sensor technical field, relate to the measurement mechanism and the measuring method of hazardous metals thing in a kind of food.
Background technology
Raising and science and technology development along with people's living standard, the level of understanding, and the food security incident that constantly exposes, make food-safety problem rise to the height of political issue and social concern, people also have higher requirement to food safety detection when appealing the reinforcement food safety management.Present stage, China's food safety detection technology was along with the aggravation of progress of science and technology and economic globalization process, and China has obtained in food safety detection technical research and application facet and developed rapidly.Detection technique trends towards hi-techization, seriation, tachymeter, portability day by day, modern detecting such as molecular engineering and biology sensor and means such as quick test paper disk method, immunological technique, molecular Biological Detection method (immunocapture PCR, quantitative fluorescent PCR, ATP biloluminescence method, miniature automatic fluorescence enzyme linked immunosorbent assay etc.) etc.
In the daily life; when chewing food such as bread, steamed bun; often have screw; or hard object such as iron wire occurs, and this injury to tooth is very big, if accidentally it is swallowed; may also can hurt internal organ; so strengthen the detection of food, avoid metal object such as iron wire to enter inside of food and seem particularly important, so invent one simply, checkout equipment is significant accurately.
At present, domesticly can detect hazardous metals article in the food, but the method cost is higher with x-ray detection system, and the pick-up unit complexity.X ray relates to radiomaterial, and safeguard procedures own are had relatively high expectations.
Summary of the invention
The objective of the invention is to overcome the above-mentioned deficiency of prior art, propose the hazardous metals article are measured in a kind of food device and measuring method.The present invention adopts following technical scheme:
A kind of measurement mechanism of the dangerous goods in food based on electromagnetic sensor, be used to measure and have or not the metal threat object product in the food, comprise electromagnetic sensor, the measurement of mutual inductance instrument, it is characterized in that, described electromagnetic sensor comprises 3 parallel and coaxial coils, two coils in the outside are receiving coil, by identical coiling according to identical coiling density, the number of turn and coil diameter and opposite direction of winding coiling form, one end of two coils interconnects, the other end separately is respectively as a receiving end, constitute differential configuration, interjacent coil is a drive coil; Two terminals of drive coil link to each other with the excitation end of measurement of mutual inductance instrument, and the terminals of receiving coil link to each other with the receiving end of measurement of mutual inductance instrument; And use the measurement of mutual inductance instrument to measure the inductance value of this sensor in two kinds of situation, a kind of situation is, electromagnetic sensor is enclosed within outside the normal food, obtains the demarcation inductance value of this electromagnetic sensor; Another kind of situation is, electromagnetic sensor is enclosed within outside the tested food, obtain the inductance measuring value of this electromagnetic sensor, whether greater than predetermined threshold value, judge whether this tested food inside exists the metal threat object product according to the ratio of demarcating difference between inductance value and the corresponding inductance measuring value and this demarcation inductance value.
As preferred implementation, measurement mechanism of the present invention, the equal diameters of three coils that adopt; Diameter is 5-500mm, and number of turns is between 1-20000; The diameter of coiling can be between 0.001mm-10mm;
The present invention provides a kind of method that adopts described measurement mechanism to measure dangerous goods in food simultaneously, comprises the following steps:
(1) described electromagnetic sensor is enclosed within on food passage or the streamline, measures normal food earlier, the measurement of mutual inductance instrument,, is stored in the measurement of mutual inductance instrument as demarcating inductance value by measuring the demarcation inductance value of receiving coil drive coil effect exciting current;
(2) for tested food, using the same method records the inductance measuring value;
(3) whether demarcate the ratio of difference between inductance value and the corresponding inductance measuring value and this demarcation inductance value greater than predetermined threshold value according to certain, judge whether this food inside exists the metal threat object product, if greater than predetermined threshold value, then judge and have the metal threat object product in the food, if less than pre-set threshold value, then judge not have the metal threat object product in the food.
The present invention has designed a kind of array of electro-magnetic sensors that whether has the metal species dangerous goods in the food that is used to detect, this array interconnects by two and constitutes the receiving coil of differential configuration and the drive coil that is positioned between the two constitutes, simple in structure, with low cost, detecting sensitively, fast, effectively, is one of testing tool of the most feasible dangerous goods in food.
Description of drawings
Fig. 1 is the measuring system apparatus structure block diagram of the dangerous goods in food based on electromagnetic sensor of the present invention;
Fig. 2 is the synoptic diagram of electromagnetic sensor.
Specific implementation method
Fig. 1 is the measurement mechanism structured flowchart that draws according to one embodiment of the invention.It is made of electromagnetic sensor 1,2 two major parts of measurement of mutual inductance instrument.
Referring to Fig. 2, electromagnetic sensor 1 is a coil array, comprises drive coil 4, receiving coil 5; Excitation is hollow with receiving coil, coaxial and be parallel to each other coil, wherein receiving coil is made of two coils of differential configuration, its method for making is, on a cylindrical frame, demarcate two coiling circles, require and decide apart from view sensor, selected 2 calibration points that are positioned on the varying cross-section on a cylindrical frame, a lead is begun to twine a circle according to the identical coiling density and the number of turn from another calibration point again after its residing xsect twines a circle since a calibration point, draw detection output terminal (being the receiving end of measurement of mutual inductance instrument) from the lead two ends, two coils adopt opposite direction of winding, thereby the formation differential configuration is to increase the sensitivity of measuring.The number of turn of the length sight line circle of this sensor and the diameter of coiling and decide, its diameter can be 5-500mm, number of turns can be between 1-20000; The diameter of coiling can be between 0.001mm-10mm; Measurement of mutual inductance instrument 2 can use commercial electric impedance analyzer (for example Agilent 4284, homemade measurement of mutual inductance instrument etc.); During measurement, this type of electromagnetic sensor can be enclosed within on food passage or the streamline, the excitation end of measurement of mutual inductance instrument is linked to each other with the excitation end 4 of electromagnetic sensor, the receiving end of measurement of mutual inductance instrument links to each other with the receiving end of electromagnetic sensor 5, measure normal food earlier, the measurement of mutual inductance instrument is to drive coil effect exciting current, by measuring the inductance value L0 of receiving coil, as demarcating inductance value, be stored in the measurement of mutual inductance instrument; For tested food, making uses the same method records inductance value L; The measurement of mutual inductance instrument is judged by the ratio size of L-L0 and L0 and is had or not the hazardous metals article in the food.By experiment or emulation, the iron wires according to put into different sizes in food can obtain the difference threshold values corresponding to the different size metal object; During judgement, default threshold values, when
During greater than threshold values, the metal threat object product are arranged in the food, when
Less than threshold values, approaching more zero, no metal threat object product in the food then are described.
The diameter of receiving coil is compared with drive coil among the present invention, and is changeable, but preferably consistent.Measuring method specifically may further comprise the steps:
(1) this type of electromagnetic sensor is enclosed within on food passage or the streamline, measures normal food earlier, the measurement of mutual inductance instrument,, is stored in the measurement of mutual inductance instrument as demarcating inductance value by measuring the inductance value L0 of receiving coil drive coil effect exciting current;
(2) for tested food, using the same method and recording the inductance measuring value is L;
(3) measurement of mutual inductance instrument 2 is judged by the ratio size of L-L0 and L0 and is had or not the hazardous metals article in the food, during judgement, and default threshold values, when
During greater than threshold values, the metal threat object product are arranged in the food, when
Less than threshold values, approaching more zero, no metal threat object product in the food then are described, wherein threshold values can be by experiment or emulation obtain.
Claims (5)
1. measurement mechanism based on the dangerous goods in food of electromagnetic sensor, be used to measure and have or not the metal threat object product in the food, comprise electromagnetic sensor, the measurement of mutual inductance instrument, it is characterized in that, described electromagnetic sensor comprises 3 parallel and coaxial coils, two coils in the outside are receiving coil, by identical coiling according to identical coiling density, the number of turn and coil diameter and opposite direction of winding coiling form, one end of two coils interconnects, the other end separately is respectively as a receiving end, constitute differential configuration, interjacent coil is a drive coil; Two terminals of drive coil link to each other with the excitation end of measurement of mutual inductance instrument, and the terminals of receiving coil link to each other with the receiving end of measurement of mutual inductance instrument; And use the measurement of mutual inductance instrument to measure the inductance value of this sensor in two kinds of situation, a kind of situation is, electromagnetic sensor is enclosed within outside the normal food, obtains the demarcation inductance value of this electromagnetic sensor; Another kind of situation is, electromagnetic sensor is enclosed within outside the tested food, obtain the inductance measuring value of this electromagnetic sensor, whether greater than predetermined threshold value, judge whether this tested food inside exists the metal threat object product according to the ratio of demarcating difference between inductance value and the corresponding inductance measuring value and this demarcation inductance value.
2. the dangerous goods in food measurement mechanism of electromagnetic sensor according to claim 1 is characterized in that, the equal diameters of described 3 coils.
3. the dangerous goods in food measurement mechanism of electromagnetic sensor according to claim 1 is characterized in that, described electromagnetic sensor is made of 3 coils, and the diameter of each coil is 5-500mm, and number of turns is between 1-20000.
4. the dangerous goods in food measurement mechanism of electromagnetic sensor according to claim 1 is characterized in that, the diameter of coiling can be between 0.001mm-10mm.
5. a method that adopts the described measurement mechanism of claim 1 to measure dangerous goods in food comprises the following steps:
(1) described electromagnetic sensor is enclosed within on food passage or the streamline, measures normal food earlier, the measurement of mutual inductance instrument,, is stored in the measurement of mutual inductance instrument as demarcating inductance value by measuring the demarcation inductance value of receiving coil drive coil effect exciting current;
(2) for tested food, using the same method records the inductance measuring value;
(3) whether demarcate the ratio of difference between inductance value and the corresponding inductance measuring value and this demarcation inductance value greater than predetermined threshold value according to certain, judge whether this food inside exists the metal threat object product, if greater than predetermined threshold value, then judge and have the metal threat object product in the food, if less than pre-set threshold value, then judge not have the metal threat object product in the food.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201010207028 CN101881838A (en) | 2010-06-23 | 2010-06-23 | Electromagnetic sensor based measuring equipment and method of dangerous goods in food |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010207028 CN101881838A (en) | 2010-06-23 | 2010-06-23 | Electromagnetic sensor based measuring equipment and method of dangerous goods in food |
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| CN101881838A true CN101881838A (en) | 2010-11-10 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102565862A (en) * | 2011-12-16 | 2012-07-11 | 朱德兵 | Gradient measurement method of transient electromagnetic response signal and observation device thereof |
| CN105588873A (en) * | 2016-03-18 | 2016-05-18 | 中国计量学院 | Externally-passing type low frequency electromagnetic testing device |
| CN107204073A (en) * | 2016-03-17 | 2017-09-26 | 富士电机株式会社 | Cup type automatic vendor |
| CN109683114A (en) * | 2019-01-31 | 2019-04-26 | 广西大学 | A kind of assembling electromagnetic sensor measuring system |
| CN110260778A (en) * | 2019-07-19 | 2019-09-20 | 华中科技大学无锡研究院 | Chamfering measurement method and device based on electromagnetic principle |
| CN110260778B (en) * | 2019-07-19 | 2024-05-17 | 华中科技大学无锡研究院 | Chamfering measurement method and device based on electromagnetic principle |
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| US5729143A (en) * | 1996-06-03 | 1998-03-17 | Zircon Corporation | Metal detector with nulling of imbalance |
| EP1092989A1 (en) * | 1999-10-13 | 2001-04-18 | HILTI Aktiengesellschaft | Inductive sensor head for metal detectors |
| CN1292128A (en) * | 1998-02-25 | 2001-04-18 | 卡施科德公司 | Induction sensor |
| CN1759329A (en) * | 2003-03-12 | 2006-04-12 | 安立产业机械株式会社 | Metal detector |
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2010
- 2010-06-23 CN CN 201010207028 patent/CN101881838A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5729143A (en) * | 1996-06-03 | 1998-03-17 | Zircon Corporation | Metal detector with nulling of imbalance |
| CN1292128A (en) * | 1998-02-25 | 2001-04-18 | 卡施科德公司 | Induction sensor |
| EP1092989A1 (en) * | 1999-10-13 | 2001-04-18 | HILTI Aktiengesellschaft | Inductive sensor head for metal detectors |
| CN1759329A (en) * | 2003-03-12 | 2006-04-12 | 安立产业机械株式会社 | Metal detector |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102565862A (en) * | 2011-12-16 | 2012-07-11 | 朱德兵 | Gradient measurement method of transient electromagnetic response signal and observation device thereof |
| CN102565862B (en) * | 2011-12-16 | 2013-11-20 | 朱德兵 | Gradient measurement method of transient electromagnetic response signal and observation device thereof |
| CN107204073A (en) * | 2016-03-17 | 2017-09-26 | 富士电机株式会社 | Cup type automatic vendor |
| CN105588873A (en) * | 2016-03-18 | 2016-05-18 | 中国计量学院 | Externally-passing type low frequency electromagnetic testing device |
| CN105588873B (en) * | 2016-03-18 | 2019-04-19 | 中国计量学院 | A kind of outer through mode low frequency electromagnetic detection device |
| CN109683114A (en) * | 2019-01-31 | 2019-04-26 | 广西大学 | A kind of assembling electromagnetic sensor measuring system |
| CN110260778A (en) * | 2019-07-19 | 2019-09-20 | 华中科技大学无锡研究院 | Chamfering measurement method and device based on electromagnetic principle |
| CN110260778B (en) * | 2019-07-19 | 2024-05-17 | 华中科技大学无锡研究院 | Chamfering measurement method and device based on electromagnetic principle |
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Application publication date: 20101110 |