CN102608215A - Method for detecting freshness of mango by using acoustic surface wave (ASW) detector - Google Patents
Method for detecting freshness of mango by using acoustic surface wave (ASW) detector Download PDFInfo
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- CN102608215A CN102608215A CN201210071653XA CN201210071653A CN102608215A CN 102608215 A CN102608215 A CN 102608215A CN 201210071653X A CN201210071653X A CN 201210071653XA CN 201210071653 A CN201210071653 A CN 201210071653A CN 102608215 A CN102608215 A CN 102608215A
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Abstract
The invention relates to a method for detecting the freshness of a mango by using an acoustic surface wave (ASW) detector. The method comprises the following steps of: (1) standing a weighed mango to be detected between two energy converters of the ASW detector in a transverse manner and a longitudinal manner respectively, enabling the distance from one end, nearest to the mango to be detected, of the two energy converters to the mango to be detected to be 1-5 mm, and starting up the ASW detector and carrying out detection for 30-60 s; and (2) gathering data acquired by the energy converters to obtain the ASW frequency data F of the mango sample to be detected, according to a preset first-grade freshness critical value F5 and a preset second-grade freshness critical value F7, judging the mango sample to be detected to have first-grade freshness if F is less than F5, judging the mango sample to be detected to have second-grade freshness if F is no less than F5 but is less than F7, judging the mango sample to be detected to be stale if F is no less than F7, and obtaining the grade of freshness of the mango to be detected. The method for detecting the freshness of the mango by using the ASW detector has the advantages of fast detection speed and good reliability in detected results.
Description
Technical field
The present invention relates to a kind of detection method of mango freshness.
Background technology
Mango is a kind of aiphyllium of original India, leaf keratin, alternate; Warm in nature, spend little, yellow or pale red, the panicle of Cheng Dingsheng produces Mango fruit and light gray timber inferior.Mango Fruit contains sugar, protein, robust fibre, and the precursor carrotene composition of the vitamin A that mango contained is high especially, is rare in all fruit.Secondly Vitamin C content is not low yet.Mineral matter, protein, fat, carbohydrate etc. also are its main nutrient composition.Mango is one of famous tropical fruit (tree), and because of its pulp is fine and smooth, unique flavor is loved by the people, and claims so have the reputation of " torrid zone fruit king ".
The mango degree of ripeness often according to the pericarp color and luster by thin out Huang of viridescent or aubergine, fruit dot or decorative pattern are obvious, fruit is takeed on perfectly round full, pulp is become yellow or orange-yellow by white, plant judgements such as shell sclerosis; Simultaneously, also can judge than recast according to fruit: the fruit submerged shows ripe.In order to improve the commodity of fruit, often carry out classification, Preservation Treatment and packing after adopting.Mango not only can be eaten raw but also can be processed into various goods, liked by the consumer.As long as select the improved seeds plantation of the market demand, the fresh-keeping and commercialization after strengthening adopting is handled, and develops processing industry simultaneously, and the mango market outlook are good.Evaluation to the mango freshness mainly is sense organ, chemistry, biological method and some other method at present.
But the method for surveying the mango freshness on the market was also not only not easy but also method accurately, the method that has waste time and energy or cost expensive; Sometimes, testing result and actual state and inconsistent.Press for a kind of objective, method is judged the quality of mango fast and effectively.
Summary of the invention
, testing result reliability relatively poor deficiency slow for the detection speed that overcomes existing mango freshness detection method the invention provides the surface acoustic wave detection instrument that utilizes that a kind of detection speed is fast, the testing result reliability is good and detect the method for mango freshness.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of method of utilizing the surface acoustic wave detection instrument to detect the mango freshness may further comprise the steps:
(1) mango to be detected after will weighing rests between two transducers of surface acoustic wave detection instrument with horizontal, vertical dual mode respectively; Make the nearest end of two transducers and mango to be detected differ 1～5mm and open the surface acoustic wave detection instrument, be 30s～60s detection time;
(2) collect the data that transducer is gathered, obtain the surface acoustic wave frequency data F of mango sample to be detected;
According to predefined one-level freshness critical value F5 and secondary freshness critical value F7, if F＜F5 then is the one-level freshness; If F5≤F＜F7 then is the secondary freshness; If F>=F7, then mango is stale, obtains the grade of freshness of mango to be detected.
Further, in the said step (2), the process of predefined one-level freshness critical value F5 and secondary freshness critical value F7 is:
(2-1) prepare the extremely close mango sample of the overall sensory properties of a collection of same kind, a part is used for artificial sense to be judged, and a part is used for the surface acoustic wave detection instrument to be measured, and obtains the mango grade of freshness according to mango freshness forecast model;
(2-2) with reference to the GB-8210-2011 standard of sensory evaluation, confirm to belong to fresh in 0～5 day, 5～7 days is medium, is stale greater than 7; Obtain the one-level freshness critical value F5 corresponding, the secondary freshness critical value F7 corresponding with the 7th day with the 5th day.
Technical conceive of the present invention is: SAW device is on piezoelectric substrate, to make two sound one electric transducers.Its effect is realization sound one an electric transducing.The principle of work of SAW device is; The transducer of substrate left end (input transducer) is transformed into acoustical signal through inverse piezoelectric effect with the electric signal of importing; This acoustical signal is propagated along substrate surface, and finally the transducer (output transducer) by substrate the right is transformed into electric signal output with acoustical signal.Characteristics are that design flexibility is big, analog/digital is compatible, group delay time deviation and frequency is selected good (optional frequency range is at 10MHz-1000MHz), the input and output impedance error is little, loss is little, anti-electromagnetic interference performance good (EMI), reliability device volume high, that make are little, in light weight, and can realize the function of multiple complicacy.The present invention is used in the mango freshness with the surface acoustic wave detection instrument and detects.
The transducer of mango left end (input transducer) is transformed into acoustical signal through inverse piezoelectric effect with the electric signal of importing, and this acoustical signal is propagated along the mango surface, and finally the transducer (output transducer) by the right is transformed into electric signal output with acoustical signal.The function of whole SAW device is through the acoustical signal of on piezoelectric substrate, propagating is carried out various processing, and the characteristic of utilization sound one electric transducer is accomplished measurement.Transducer is exactly the planar technology that adopts SIC (semiconductor integrated circuit); At the certain thickness aluminium film of piezoelectric substrate surface vapor deposition; Utilize the mask pattern of two IDT that design photoetching method to be deposited on substrate surface again, respectively as input transducer and output transducer.
Beneficial effect of the present invention mainly shows: 1, detection speed is fast, the testing result reliability is good; 2, design flexibility is big, analog/digital is compatible, group delay time deviation and frequency are selected good (optional frequency range is at 10MHz-1000MHz), the input and output impedance error is little, loss is little, anti-electromagnetic interference performance good (EMI), reliability device volume high, that make are little, in light weight, and can realize the function of multiple complicacy.
Description of drawings
Fig. 1 detects the process flow diagram of the method for mango freshness for the present invention utilizes the surface acoustic wave detection instrument.
Fig. 2 is a surface acoustic wave detection instrument detection system structural representation.
Fig. 3 is the schematic illustrations of surface acoustic wave detection instrument measuring system.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
See figures.1.and.2, a kind of method of utilizing the surface acoustic wave detection instrument to detect the mango freshness may further comprise the steps:
(1) mango to be detected after will weighing rests between two transducers of surface acoustic wave detection instrument with horizontal, vertical dual mode respectively; Make the nearest end of two transducers and mango to be detected differ 1～5mm and open the surface acoustic wave detection instrument, be 30s～60s detection time;
(2) collect the data that transducer is gathered, obtain the surface acoustic wave frequency data F of mango sample to be detected;
According to predefined one-level freshness critical value F5 and secondary freshness critical value F7, if F＜F5 then is the one-level freshness; If F5≤F＜F7 then is the secondary freshness; If F>=F7, then mango is stale, obtains the grade of freshness of mango to be detected.
Further, in the said step (2), the process of predefined one-level freshness critical value F5 and secondary freshness critical value F7 is:
(2-1) prepare the extremely close mango sample of the overall sensory properties of a collection of same kind, a part is used for artificial sense to be judged, and a part is used for the surface acoustic wave detection instrument to be measured, and obtains the mango grade of freshness according to mango freshness forecast model;
(2-2) with reference to the GB-8210-2011 standard of sensory evaluation, it is fresh confirming to deposit 0～5 day mango sample quality, and it is medium depositing 5～7 days sample qualities, is stale greater than 7 days sample qualities; Confirm that the mango sample surface acoustic wave frequency F5 that deposited 5 days is an one-level freshness critical value, corresponding mango sample surface acoustic wave frequency F7 was a secondary freshness critical value in the 7th day.
In the present embodiment, the GB-8210-2011 standard of sensory evaluation: sample is stored 12 days, and the method that judge with artificial sense every day is at first measured the low water degree of mango, and method is the priori outward appearance, cuts open then, identifies its rank according to the low water graded features one by one.Low water has been fruit for 0 grade, and pericarp is normal, and skin and flesh is close to, and the juice born of the same parents are normal, and fruit is plentiful; The a small amount of juice born of the same parents of the slight low water of one-level are slight low water; Secondary moderate low water 50% juice born of the same parents low water; Three grades of most of low water of severe low water juice born of the same parents.Next measures the local flavor of mango, and method is to clean mango to wipe away driedly, cuts pintongs with stainless steel knife, and part crosscut two lobes can be observed flesh color, and core is big or small; Taste the flavour quality, change the slag degree; Smell its fragrance; The measurement peel thickness is judged.Through check, in this experiment, it is fresh light yellow to record 0～5 day epidermis of mango, and pulp is tender and crisp good to eat, and moisture is high, and pericarp is abundant, and the fruits smell intensely sweet; Pericarp began drying shrinkage in 5～7 days, deepened yellow, the pericarp attenuation, and consolidation descends, and fruit is still moisture fully, and still can smell micro-fruital flavor; Begin atrophy since the 7th day mango pericarp and pulp, the sign that rots appears in the part blackening, the softening attenuation of pericarp even break, and consolidation continues to descend, and the pulp drying shrinkage is moisture few, and almost can not smell fruital flavor part has rotten taste.Detect fruit shape index at last, measure the vertical footpath of fruit (by fruit top to base of a fruit end) with vernier caliper and ruler one by one and press fruit shape index=transverse diameter divided by vertical directly calculating with transverse diameter (the section diameter of equatorial line).Utilize SAWR to analyze all samples at last;
It is as shown in Figure 2 that the present invention utilizes the surface acoustic wave detector to detect the process flow diagram of method of mango freshness.
The experimental procedure that detects the mango freshness is:
(1) three mango after will weighing rest between two transducers with horizontal, vertical two kinds of uniform way respectively, make the nearest end of two transducers and mango differ 1～5mm, unlatching surface acoustic wave detection instrument, and be 30s～60s detection time.
(2) collect the data that transducer is gathered, the data of gathering are carried out data processing, do broken line graph according to data processed result and judge that the mango freshness changes.
(3) continuous coverage is 12 days, and statistics and deal with data are reached a conclusion.
The mango quality constantly reduces along with the increase of fate, and the horizontal surface acoustic wave of mango was the separatrix with the 5th day, and change in the past in the 5th day is bigger, value of tending towards stability about 350 after the 5th day.Mango surface acoustic wave longitudinally was the separatrix with the 7th day, and change in the past in the 7th day is bigger, the 7th day value of tending towards stability about 350 later on.The surface acoustic wave measuring instrument can be judged the freshness of mango more accurately.
Claims (2)
1. method of utilizing the surface acoustic wave detection instrument to detect the mango freshness is characterized in that: may further comprise the steps:
(1) mango to be detected after will weighing rests between two transducers of surface acoustic wave detection instrument with horizontal, vertical dual mode respectively; Make the nearest end of two transducers and mango to be detected differ 1～5mm and open the surface acoustic wave detection instrument, be 30s～60s detection time;
(2) collect the data that transducer is gathered, obtain the surface acoustic wave frequency data F of mango sample to be detected;
According to predefined one-level freshness critical value F5 and secondary freshness critical value F7, if F＜F5 then is the one-level freshness; If F5≤F＜F7 then is the secondary freshness; If F>=F7, then mango is stale, obtains the grade of freshness of mango to be detected.
2. a kind of according to claim 1 method of utilizing the surface acoustic wave detection instrument to detect the mango freshness, it is characterized in that: in the said step (2), the process of predefined one-level freshness critical value F5 and secondary freshness critical value F7 is:
(2-1) prepare the extremely close mango sample of the overall sensory properties of a collection of same kind, a part is used for artificial sense to be judged, and a part is used for the surface acoustic wave detection instrument to be measured, and obtains the mango grade of freshness according to mango freshness forecast model;
(2-2) with reference to the GB-8210-2011 standard of sensory evaluation, confirm to belong to fresh in 0～5 day, 5～7 days is medium, is stale greater than 7; Obtain the one-level freshness critical value F5 corresponding, the secondary freshness critical value F7 corresponding with the 7th day with the 5th day.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103412005A (en) * | 2013-08-22 | 2013-11-27 | 浙江工商大学 | Detection method for storage time of sweet oranges |
| CN103412004A (en) * | 2013-08-22 | 2013-11-27 | 浙江工商大学 | Method for detecting storage time of citrus sinensis |
| CN103412051A (en) * | 2013-08-22 | 2013-11-27 | 浙江工商大学 | Detection method for cherimoya storage time |
| CN103424524A (en) * | 2013-08-22 | 2013-12-04 | 浙江工商大学 | Method of detecting storage time of Annona squamosa |
-
2012
- 2012-03-17 CN CN201210071653XA patent/CN102608215A/en active Pending
Non-Patent Citations (2)
| Title |
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| 莫润阳: "无损检测技术在水果品质评价中的应用", 《物理学和高新技术》 * |
| 贺昀轩: "基于超声波的芒果成熟度检测研究", 《广西大学硕士学位论文》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103412005A (en) * | 2013-08-22 | 2013-11-27 | 浙江工商大学 | Detection method for storage time of sweet oranges |
| CN103412004A (en) * | 2013-08-22 | 2013-11-27 | 浙江工商大学 | Method for detecting storage time of citrus sinensis |
| CN103412051A (en) * | 2013-08-22 | 2013-11-27 | 浙江工商大学 | Detection method for cherimoya storage time |
| CN103424524A (en) * | 2013-08-22 | 2013-12-04 | 浙江工商大学 | Method of detecting storage time of Annona squamosa |
| CN103424524B (en) * | 2013-08-22 | 2015-01-07 | 浙江工商大学 | Method of detecting storage time of Annona squamosa |
| CN103412004B (en) * | 2013-08-22 | 2015-02-25 | 浙江工商大学 | Method for detecting storage time of citrus sinensis |
| CN103412005B (en) * | 2013-08-22 | 2015-02-25 | 浙江工商大学 | Detection method for storage time of sweet oranges |
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Application publication date: 20120725 |