CN102928513B - Ultrasonic device for nondestructive examination of watermelon maturity - Google Patents
Ultrasonic device for nondestructive examination of watermelon maturity Download PDFInfo
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- CN102928513B CN102928513B CN201210427027.XA CN201210427027A CN102928513B CN 102928513 B CN102928513 B CN 102928513B CN 201210427027 A CN201210427027 A CN 201210427027A CN 102928513 B CN102928513 B CN 102928513B
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Abstract
The invention discloses a kind of ultrasonic device for nondestructive examination of watermelon maturity, comprise central processing unit, LCDs, keyboard, weight detecting module and degree of ripeness detection module, keyboard, LCDs are connected with central processing unit respectively, weight detecting module comprises pressure transducer, the first signal processing circuit, A/D change-over circuit, and degree of ripeness detection module comprises radiating circuit, the first ultrasonic probe, the second ultrasonic probe, secondary signal treatment circuit.The present invention utilizes this characteristic of difference between watermelon peel and the acoustic impedance of melon pulp, ultrasound wave is allowed to propagate in watermelon tissue, gather interfacial reflection wave, Fourier transform is utilized to calculate reflection configuration amplitude, recycling fuzzy algorithm is corresponding with degree of ripeness by amplitude, more high reverse--bias waveforms amplitude is larger for degree of ripeness, by lot of experimental data, and the amplitude thresholds of setting degree of ripeness grade.Accuracy in detection of the present invention is high, structure is simple, low cost of manufacture, easy to carry, be easy to promote.
Description
Technical field
The present invention relates to agricultural product electronic pick-up unit, be specifically related to a kind of ultrasonic device for nondestructive examination of watermelon maturity.
Background technology
Watermelon is one of important industrial crops of China, and the degree of ripeness of watermelon not only affects the economic benefit of melon grower and watermelon dealer, also have impact on the vital interests of consumer.Watermelon is in the various stages of growth, and all there are differences between watermelon peel and the acoustic impedance of melon pulp, watermelon this species diversity more ripe is larger.Degree of ripeness that people commonly use qualification mode has calculation, sees, listens, survey etc., and these methods containing the subjective consciousness of people are all difficult to make accurate interpretation to Watermelon Maturity.And current various Watermelon ripeness non-destructive detector both domestic and external, be all the Non-Destructive Testing utilizing sound method of shaking melon and fruit series products to be carried out to degree of ripeness, these class methods are undoubtedly the quite valuable effective ways of one.And forefathers have carried out large quantity research to the acoustic characteristic of knocking of watermelon, confirm the degree of ripeness that can judge watermelon by knocking acoustics.But mostly most of test apparatus is that, based on PC or large-scale instrument, price is very expensive, volume also not easy to operate, and most is comparatively large, and therefore current Watermelon Maturity detects also has certain distance from practicality.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides that a kind of accuracy in detection is high, structure be simple, low cost of manufacture, easy to carry, be easy to the ultrasonic device for nondestructive examination of watermelon maturity promoted.
The technical scheme that the present invention solves the problem is: comprise central processing unit, LCDs, keyboard, degree of ripeness detection module, keyboard, LCDs is connected with central processing unit respectively, described degree of ripeness detection module comprises radiating circuit, first ultrasonic probe, second ultrasonic probe, secondary signal treatment circuit, radiating circuit one end connects central processing unit, the other end is connected with the first ultrasonic probe, secondary signal treatment circuit one end is connected with the second ultrasonic probe, the other end is connected to central processing unit, central processing unit sends pulsating wave, amplify through radiating circuit, ultrasound wave is launched by the first ultrasonic probe, second ultrasonic probe receives the sound wave of returning from watermelon internal reflection, again after secondary signal processing circuit processes, give central processing unit to process, degree of ripeness is shown by LCDs after process.
In above-mentioned ultrasonic device for nondestructive examination of watermelon maturity, also comprise weight detecting module, described weight detecting module comprises pressure transducer, the first signal processing circuit, A/D change-over circuit, pressure transducer, the first signal processing circuit, A/D change-over circuit are connected in series successively, pressure transducer exports the direct current signal of certain value because of watermelon weight, signal is through signal processing circuit, again through A/D change-over circuit, simulating signal is converted to digital signal and give central processing unit analyzing and processing, show watermelon weight by LCDs.
The invention has the beneficial effects as follows: the present invention utilizes the difference between watermelon peel and the acoustic impedance of melon pulp, ultrasound wave is allowed to propagate in watermelon tissue, gather interfacial reflection wave, Fourier transform is utilized to calculate reflection configuration amplitude, recycling fuzzy algorithm by amplitude compared with degree of ripeness, can detect the degree of ripeness of watermelon, accuracy in detection is high, structure is simple, low cost of manufacture, easy to carry, be easy to promote.
Accompanying drawing explanation
Fig. 1 is structural drawing of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further illustrated.
The principle that in the present invention, Watermelon Maturity detects: watermelon density difference of watermelon peel and flesh of Pulp Citrulli in developmental process increases along with the increase of degree of ripeness, and in particle, the acoustic characteristic impedance of the product of the velocity of sound and density also increases along with the increase of degree of ripeness.
Secondly, for the ultrasound wave of 40kHz, its wavelength X=37.5mm in watermelon, and the interface of watermelon peel and flesh of Pulp Citrulli is obviously greater than its wavelength.So the interface of watermelon peel and flesh of Pulp Citrulli is reflex for being large interface this system to incident ultrasound wave.
When acoustic beam is incident to level and smooth large interface, acoustic energy returns former medium from boundary reflection; The amplitude (A) of reflection acoustic beam has following relational expression with sound intensity reflection coefficient (RA):
Z in formula
1, Z
2be respectively the acoustic characteristic impedance of first medium and second medium.θ i is people's firing angle; θ t is angle of penetration.
Therefore, the amplitude of reflective echo depends primarily on the acoustic characteristic impedance difference degree of large interface media of both sides, and difference is larger, and reflective echo amplitude is larger, penetrates magnitudes of acoustic waves less.Utilize this relation can set up a kind of fuzzy relation formula to judge the degree of ripeness of watermelon.
See Fig. 1, the present invention includes central processing unit 3, LCDs 1, keyboard 2, weight detecting module and degree of ripeness detection module, keyboard 2, LCDs 1 are connected with central processing unit 3 respectively, described weight detecting module comprises pressure transducer 9, first signal processing circuit 10, A/D change-over circuit 11, and pressure transducer 9, first signal processing circuit 10, A/D change-over circuit 11 are connected in series successively; Described degree of ripeness detection module comprises radiating circuit 4, first ultrasonic probe 6, second ultrasonic probe 7, secondary signal treatment circuit 5, radiating circuit 4 one end connects central processing unit 3, the other end is connected with the first ultrasonic probe 6, secondary signal treatment circuit 5 one end is connected with the second ultrasonic probe 7, and the other end is connected to central processing unit 3.
LCDs 1 shows Watermelon Maturity (A is overdone, B proper mature (ripe), C are half-mature, D is not yet done) and weight inventory, and both can freely switch; Keyboard 2 is used for inputting numeral 0 ~ 9, inputs several Weighing control instruction in addition, so this Watermelon Maturity Ultrasonic NDT claims to can be applicable to retail watermelon or growth of watermelon family (field, institute).
The present invention is using central processing unit 3 as control core, weight detecting module can select resistance strain type pressure sensor, carry out amplifying through the first signal processing circuit 10, filtering, after amplitude limiting processing, deliver to A/D change-over circuit 11 and convert simulating signal to digital signal, then digital signal is given central processing unit 3 to process, show watermelon weight by LCDs 1.Degree of ripeness detection module produces high energy pulse by central processing unit 3 through radiating circuit 4, and excitation ultrasonic transducer, makes it to send ultrasound wave, propagate in watermelon tissue, finally return in the surface reflections of melon skin and melon pulp.Due to the reversible effect of transducer, the ultrasound wave reflected converts again electric pulse to and delivers to secondary signal treatment circuit 5, through filtering, amplify, filtering again, after amplitude limit, the ADC carried by central processing unit 3 carries out Wave data collection, central processing unit 3 utilizes Fourier transform and fuzzy algorithm to process collection signal, after process and the data that prestore of system compare, by corresponding degree of ripeness relatively can be drawn, control LCDs 1 by central controller 3 again and show its testing result (degree of ripeness), be shown as " overdone ", " proper mature (ripe) ", " half-mature ", " not yet done " or by " A ", " B ", " C ", the degree of ripeness of " D " four grade display watermelons.
Claims (2)
1. a ultrasonic device for nondestructive examination of watermelon maturity, comprise central processing unit, LCDs, keyboard, degree of ripeness detection module, keyboard, LCDs is connected with central processing unit respectively, it is characterized in that: described degree of ripeness detection module comprises radiating circuit, first ultrasonic probe, second ultrasonic probe, secondary signal treatment circuit, radiating circuit one end connects central processing unit, the other end is connected with the first ultrasonic probe, secondary signal treatment circuit one end is connected with the second ultrasonic probe, the other end is connected to central processing unit, central processing unit sends pulsating wave, amplify through radiating circuit, ultrasound wave is launched by the first ultrasonic probe, second ultrasonic probe receives the sound wave of returning from watermelon internal reflection, again after secondary signal processing circuit processes, give central processing unit to process, degree of ripeness is shown by LCDs after process.
2. ultrasonic device for nondestructive examination of watermelon maturity according to claim 1, it is characterized in that: also comprise weight detecting module, described weight detecting module comprises pressure transducer, first signal processing circuit, A/D change-over circuit, pressure transducer, first signal processing circuit, A/D change-over circuit is connected in series successively, pressure transducer exports the direct current signal of certain value because of watermelon weight, signal is through signal processing circuit, again through A/D change-over circuit, simulating signal is converted to digital signal and give central processing unit analyzing and processing, watermelon weight is shown by LCDs.
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| CN201210427027.XA CN102928513B (en) | 2012-10-31 | 2012-10-31 | Ultrasonic device for nondestructive examination of watermelon maturity |
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| CN201210427027.XA CN102928513B (en) | 2012-10-31 | 2012-10-31 | Ultrasonic device for nondestructive examination of watermelon maturity |
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| CN102928513A CN102928513A (en) | 2013-02-13 |
| CN102928513B true CN102928513B (en) | 2015-07-29 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103424474B (en) * | 2013-08-06 | 2015-07-15 | 浙江大学 | Acoustic nondestructive fruit quality testing device |
| CN104062357B (en) * | 2014-05-23 | 2016-05-11 | 浙江大学 | Watermelon percussion vibration Multipoint synchronous measurement mechanism |
| CN104764863B (en) * | 2015-03-25 | 2017-05-17 | 深圳市柳迪科技有限公司 | Device and method for detecting nut pulp plumpness |
| CN105466847A (en) * | 2015-12-05 | 2016-04-06 | 重庆丰之农农业开发有限公司 | Watermelon maturity judging device |
| CN113008984A (en) * | 2021-02-24 | 2021-06-22 | 安徽中科昊音智能科技有限公司 | Voiceprint detection fruit maturity analysis instrument |
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| CN201548524U (en) * | 2009-09-25 | 2010-08-11 | 刘志壮 | Hand-held nondestructive testing instrument for maturity of watermelon |
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| CN201935902U (en) * | 2011-03-09 | 2011-08-17 | 黑龙江八一农垦大学 | Nondestructive inspection system for watermelon maturity |
| CN102411015A (en) * | 2011-07-29 | 2012-04-11 | 东北林业大学 | Watermelon ripeness non-destructive detector and detecting method |
| CN202837246U (en) * | 2012-10-31 | 2013-03-27 | 吴新开 | Ultrasonic non-destructive detecting device for watermelon maturity |
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| JP4654335B2 (en) * | 2004-09-10 | 2011-03-16 | 国立大学法人豊橋技術科学大学 | Ultrasonic image inspection method, ultrasonic image inspection apparatus |
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Patent Citations (6)
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|---|---|---|---|---|
| CN101413928A (en) * | 2008-11-14 | 2009-04-22 | 江苏大学 | Fowl egg crack rapid on-line nondestructive detection device and method based on acoustic characteristic |
| CN201548524U (en) * | 2009-09-25 | 2010-08-11 | 刘志壮 | Hand-held nondestructive testing instrument for maturity of watermelon |
| CN102095797A (en) * | 2010-10-29 | 2011-06-15 | 华南理工大学 | Fruit ripeness ultrasonic non-destructive detection method and system based on comparison method |
| CN201935902U (en) * | 2011-03-09 | 2011-08-17 | 黑龙江八一农垦大学 | Nondestructive inspection system for watermelon maturity |
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