CN102411015A - Watermelon ripeness non-destructive detector and detecting method - Google Patents
Watermelon ripeness non-destructive detector and detecting method Download PDFInfo
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- CN102411015A CN102411015A CN2011102165471A CN201110216547A CN102411015A CN 102411015 A CN102411015 A CN 102411015A CN 2011102165471 A CN2011102165471 A CN 2011102165471A CN 201110216547 A CN201110216547 A CN 201110216547A CN 102411015 A CN102411015 A CN 102411015A
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Abstract
A watermelon ripeness non-destructive detector and detecting method relate to a watermelon ripeness detector and detecting method, which solve the problem in the current watermelon ripeness non-destructive detecting method that has low accuracy. The detector includes a weight sensor for detecting the weight of the watermelon to be detected and an MEMS acceleration transducer for detecting the vibratory magnitude of the watermelon to be detected; an analog quantity signal of the MEMS acceleration transducer is inputted to a processor via A/D converting. The detecting method includes: measuring the weight and the vibratory magnitude of the watermelon, fast Fourier transforming the vibratory magnitude to obtain the vibration frequency of the watermelon to be detected; calculating the modulus of elasticity of the watermelon to be detected according to the weight and the vibratory magnitude of the watermelon, wherein the modulus of elasticity is the ripeness of the watermelon to be detected, and realizing the ripeness detection of the watermelon to be detected. The invention is suitable for non-destructively detecting the watermelon ripeness.
Description
Technical field
The present invention relates to a kind of watermelon degree of ripeness detector and detection method.
Background technology
Watermelon is one of important industrial crops of China, under the situation increasingly high to quality requirements of market, also needs accurate and harmless its degree of ripeness of judgement in the classification of watermelon, storage, transportation and the sales process.But methods such as the evaluation of the harmless degree of ripeness of watermelon is at present still adopted traditional calculation, sees, listened, survey; These methods all are difficult to the watermelon degree of ripeness is made accurate judgement; And depend on the personal experience, time-consuming in extensive the detection, the very difficult needs that adapt to current watermelon production and selling.Therefore, accurate, quick, easy watermelon degree of ripeness Dynamic Non-Destruction Measurement has great theory and practice meaning.
Summary of the invention
The present invention is the low problem of method accuracy that has Non-Destructive Testing watermelon degree of ripeness now in order to solve, thereby a kind of watermelon degree of ripeness nondestructive testing instrument and detection method are provided.
Watermelon degree of ripeness nondestructive testing instrument; It comprises pallet, weight sensor, MEMS acceleration transducer, A/D converter and processor; Pallet is the rest area of watermelon to be measured; Weight sensor is used to detect the weight of watermelon to be measured; The MEMS acceleration transducer is used to detect the vibratory output of watermelon to be measured, and the analog signals output terminal of MEMS acceleration transducer is connected with the analog signals input end of A/D converter, and the digital quantity signal output terminal of A/D converter is connected with the digital signal input end of processor.
Based on the watermelon degree of ripeness lossless detection method of said apparatus, it is realized by following steps:
Step 1, watermelon to be measured is positioned on the pallet, adopts weight sensor to detect the pressure that pallet receives, obtain the weight m of watermelon to be measured;
Step 2, knock watermelon to be measured surface, adopt the MEMS acceleration transducer to detect the vibratory output of watermelon to be measured, and said vibratory output is carried out the A/D conversion;
Step 3, employing processor carry out Fast Fourier Transform (FFT) to the vibratory output after the A/D conversion that step 2 obtains, and obtain the vibration frequency f of watermelon to be measured;
Step 4, employing processor pass through formula to the weight m of the watermelon to be measured of step 1 acquisition and the vibration frequency f of step 3 acquisition:
E∞f
2m
2/3
Obtain the elastic modulus E of watermelon to be measured, said elastic modulus E is the degree of ripeness of watermelon to be measured, realizes that the degree of ripeness of watermelon to be measured detects.
Adopt display to show the degree of ripeness testing result of watermelon to be measured.
Beneficial effect: the present invention need not to destroy the watermelon physical arrangement, can detect the degree of ripeness of watermelon, and accuracy in detection is high.
Description of drawings
Fig. 1 is the structural representation of watermelon detector among the present invention.
Embodiment
Embodiment one, combination Fig. 1 explain this embodiment; Watermelon degree of ripeness nondestructive testing instrument; It comprises pallet 1, weight sensor 2, MEMS acceleration transducer 3, A/D converter 4 and processor 5; Pallet 1 is the rest area of watermelon to be measured, and weight sensor 2 is used to detect the weight of watermelon to be measured, and MEMS acceleration transducer 3 is used to detect the vibratory output of watermelon to be measured; The analog signals output terminal of MEMS acceleration transducer 3 is connected with the analog signals input end of A/D converter 4, and the digital quantity signal output terminal of A/D converter 4 is connected with the digital signal input end of processor 5.
Principle: the watermelon model can be assumed to be following 2 kinds of situation, for the limiting case (white flesh melon) of immature melon, can regard a desirable medicine ball simply as; And ripe watermelon when it receives impact shock, then can be regarded a system that is made up of flexible member and damping element as, promptly is used as damping to melon pulp, regards whole watermelon as an inside be the elastic body of damping.According to elastic body vibration: the frequency of the vibratory response that is caused by impact is elastomeric natural frequency.The natural frequency of spheroid is relevant with factors such as the density of its material, physical dimension and elastic modulus.Its relation can be solved by the differential equation of spheroid vibration.
Equation can obtain the relation of watermelon elastic modulus E and natural frequency f and is thus:
E∞f
2m
2/3
So, for the watermelon of quality m,, utilize following formula through detecting its natural frequency f, can obtain elastic modulus E, and show the value of elastic modulus E, because the value of elastic modulus E is more little, the degree of ripeness of watermelon is high more, thereby realizes the Non-Destructive Testing of watermelon degree of ripeness.
It also comprises the elastomeric check band; The two ends of elastomeric check band are fixed on the edge of pallet 1; MEMS acceleration transducer 3 is fixed on the elastomeric check band; In detection, the elastomeric check band is enclosed within on the watermelon to be measured, adopt the vibratory output that is fixed on the 3 pairs of watermelons to be measured of MEMS acceleration transducer on the elastomeric check band to measure.
The difference of embodiment two, this embodiment and embodiment one described watermelon degree of ripeness nondestructive testing instrument is that it also comprises display 6, and the shows signal input end of display 6 is connected with the shows signal output terminal of processor 5.
In this embodiment, adopt 6 pairs of vibration frequency, watermelon quality and vibrational waveforms that show in the testing process of display, and watermelon degree of ripeness result is shown.
The difference of embodiment three, this embodiment and embodiment two described watermelon degree of ripeness nondestructive testing instruments is that display 6 is a LCD.
The difference of embodiment four, this embodiment and embodiment one, two or three described watermelon degree of ripeness nondestructive testing instruments is that it also comprises keyboard 7, and the keyboard signal output terminal of keyboard 7 is connected with the keyboard signal input end of processor 5.
This embodiment can directly be imported the concrete parameter of watermelon to be measured through keyboard 7, and then obtain the degree of ripeness of watermelon to be measured.
Embodiment five, based on the watermelon degree of ripeness lossless detection method of embodiment one, it is realized by following steps:
Step 1, watermelon to be measured is positioned on the pallet 1, adopts weight sensor 2 to detect the pressure that pallets 1 receive, obtain the weight m of watermelon to be measured;
Step 2, knock watermelon to be measured surface, adopt MEMS acceleration transducer 3 to detect the vibratory output of watermelon to be measured, and said vibratory output is carried out the A/D conversion;
Step 3, the vibratory output after the A/D conversion that adopts 5 pairs of step 2 of processor to obtain carry out Fast Fourier Transform (FFT), obtain the vibration frequency f of watermelon to be measured;
The weight m of the watermelon to be measured that step 4,5 pairs of step 1 of employing processor obtain and the vibration frequency f that step 3 obtains pass through formula:
E∞f
2m
2/3
Obtain the elastic modulus E of watermelon to be measured, said elastic modulus E is the degree of ripeness of watermelon to be measured, realizes that the degree of ripeness of watermelon to be measured detects.
Principle: the institutional framework of watermelon mainly is melon skin and melon pulp, and great deal of experiment data shows that at the watermelon of early days of growth, the physical parameter of its melon skin and melon pulp is more or less the same, like density, Young modulus, hardness etc.; And ripe watermelon; Its melon skin and melon pulp have tangible difference; The difference of its each item physical parameter is also bigger, and the consistency and elasticity modulus of melon skin increases gradually, but adhesion diminishes with degree of ripeness between inner melon pulp histocyte; Therefore melon pulp fluff, crisp, the elastic modulus of melon pulp diminishes with ripe.And has higher correlativity between the elastic modulus of watermelon and its natural frequency; Related coefficient is up to 0.90, and the degree of ripeness of watermelon can be characterized by its elastic modulus, and promptly the value when elastic modulus E is more little; The degree of ripeness of watermelon is high more, thereby realizes the Non-Destructive Testing of watermelon degree of ripeness.
The difference of embodiment six, this embodiment and embodiment five described watermelon degree of ripeness lossless detection methods is, adopts display 6 to show the degree of ripeness testing result of watermelon to be measured.
Claims (6)
1. watermelon degree of ripeness nondestructive testing instrument; It is characterized in that: it comprises pallet (1), weight sensor (2), MEMS acceleration transducer (3), A/D converter (4) and processor (5); Pallet (1) is the rest area of watermelon to be measured; Weight sensor (2) is used to detect the weight of watermelon to be measured; MEMS acceleration transducer (3) is used to detect the vibratory output of watermelon to be measured, and the analog signals output terminal of MEMS acceleration transducer (3) is connected with the analog signals input end of A/D converter (4), and the digital quantity signal output terminal of A/D converter (4) is connected with the digital signal input end of processor (5).
2. watermelon degree of ripeness nondestructive testing instrument according to claim 1 is characterized in that it also comprises display (6), and the shows signal input end of display (6) is connected with the shows signal output terminal of processor (5).
3. according to the watermelon degree of ripeness nondestructive testing instrument of claim said 2, it is characterized in that display (6) is a LCD.
4. according to claim 1,2 or 3 described watermelon degree of ripeness nondestructive testing instruments, it is characterized in that it also comprises keyboard (7), the keyboard signal output terminal of keyboard (7) is connected with the keyboard signal input end of processor (5).
5. based on the watermelon degree of ripeness lossless detection method of claim 1, it is characterized in that: it is realized by following steps:
Step 1, watermelon to be measured is positioned on the pallet (1), adopts weight sensor (2) to detect the pressure that pallet (1) receives, obtain the weight m of watermelon to be measured;
Step 2, knock watermelon to be measured surface, adopt MEMS acceleration transducer (3) to detect the vibratory output of watermelon to be measured, and said vibratory output is carried out the A/D conversion;
Step 3, employing processor (5) carry out Fast Fourier Transform (FFT) to the vibratory output after the A/D conversion that step 2 obtains, and obtain the vibration frequency f of watermelon to be measured;
Step 4, employing processor (5) pass through formula to the weight m of the watermelon to be measured of step 1 acquisition and the vibration frequency f of step 3 acquisition:
E∞f
2m
2/3
Obtain the elastic modulus E of watermelon to be measured, said elastic modulus E is the degree of ripeness of watermelon to be measured, realizes that the degree of ripeness of watermelon to be measured detects.
6. watermelon degree of ripeness lossless detection method according to claim 5 is characterized in that adopting display (6) to show the degree of ripeness testing result of watermelon to be measured.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928513A (en) * | 2012-10-31 | 2013-02-13 | 吴新开 | Ultrasonic device for nondestructive examination of watermelon maturity |
| CN105424518A (en) * | 2015-07-30 | 2016-03-23 | 石河子大学 | Nondestructive testing device for firmness of bergamot pears |
| CN107328683A (en) * | 2017-09-05 | 2017-11-07 | 卢浩然 | A kind of Watermelon Maturity monitoring device |
| CN109392442A (en) * | 2018-12-06 | 2019-03-01 | 北海归园农业技术有限公司 | A kind of wet packet jackfruit maturation detection, picking lever |
| CN110568133A (en) * | 2019-08-17 | 2019-12-13 | 凤台县绿好蔬菜种植专业合作社 | Watermelon maturity detection method and device based on vibration analysis |
| CN111189916A (en) * | 2020-01-14 | 2020-05-22 | 江南大学 | Watermelon quality vibration detection and signal processing system |
| CN113588787A (en) * | 2021-07-28 | 2021-11-02 | 广东工业大学 | Watermelon maturity detector and detection method |
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| CN202153202U (en) * | 2011-07-29 | 2012-02-29 | 东北林业大学 | Nondestructive detector for detecting maturity of watermelon |
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| CN202153202U (en) * | 2011-07-29 | 2012-02-29 | 东北林业大学 | Nondestructive detector for detecting maturity of watermelon |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928513A (en) * | 2012-10-31 | 2013-02-13 | 吴新开 | Ultrasonic device for nondestructive examination of watermelon maturity |
| CN102928513B (en) * | 2012-10-31 | 2015-07-29 | 吴新开 | Ultrasonic device for nondestructive examination of watermelon maturity |
| CN105424518A (en) * | 2015-07-30 | 2016-03-23 | 石河子大学 | Nondestructive testing device for firmness of bergamot pears |
| CN107328683A (en) * | 2017-09-05 | 2017-11-07 | 卢浩然 | A kind of Watermelon Maturity monitoring device |
| CN107328683B (en) * | 2017-09-05 | 2019-08-13 | 卢浩然 | A kind of Watermelon Maturity monitoring device |
| CN109392442A (en) * | 2018-12-06 | 2019-03-01 | 北海归园农业技术有限公司 | A kind of wet packet jackfruit maturation detection, picking lever |
| CN109392442B (en) * | 2018-12-06 | 2022-02-22 | 宁波远志立方能源科技有限公司 | Wet package jack fruit maturity detects picks pole |
| CN110568133A (en) * | 2019-08-17 | 2019-12-13 | 凤台县绿好蔬菜种植专业合作社 | Watermelon maturity detection method and device based on vibration analysis |
| CN111189916A (en) * | 2020-01-14 | 2020-05-22 | 江南大学 | Watermelon quality vibration detection and signal processing system |
| CN113588787A (en) * | 2021-07-28 | 2021-11-02 | 广东工业大学 | Watermelon maturity detector and detection method |
| CN113588787B (en) * | 2021-07-28 | 2023-09-19 | 广东工业大学 | Watermelon maturity detector and detection method |
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Application publication date: 20120411 |