CN1180253C - Portable watermelon tester apparatus - Google Patents
Portable watermelon tester apparatus Download PDFInfo
- Publication number
- CN1180253C CN1180253C CNB021363781A CN02136378A CN1180253C CN 1180253 C CN1180253 C CN 1180253C CN B021363781 A CNB021363781 A CN B021363781A CN 02136378 A CN02136378 A CN 02136378A CN 1180253 C CN1180253 C CN 1180253C
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- Prior art keywords
- watermelon
- amplifier
- resistance
- microprocessor
- microphones
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- 241000219109 Citrullus Species 0.000 title claims abstract description 37
- 235000012828 Citrullus lanatus var citroides Nutrition 0.000 title claims abstract description 37
- 239000003086 colorant Substances 0.000 claims abstract description 6
- 239000010985 leather Substances 0.000 claims abstract description 5
- 241000519996 Teucrium chamaedrys Species 0.000 claims description 8
- 102000008482 12E7 Antigen Human genes 0.000 claims description 6
- 108010020567 12E7 Antigen Proteins 0.000 claims description 6
- 101000893549 Homo sapiens Growth/differentiation factor 15 Proteins 0.000 claims description 6
- 101000692878 Homo sapiens Regulator of MON1-CCZ1 complex Proteins 0.000 claims description 6
- 102100026436 Regulator of MON1-CCZ1 complex Human genes 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 9
- 238000005259 measurement Methods 0.000 abstract description 6
- 238000001514 detection method Methods 0.000 abstract description 3
- 230000001066 destructive effect Effects 0.000 abstract description 2
- 230000005070 ripening Effects 0.000 abstract 2
- 230000032683 aging Effects 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 230000003321 amplification Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 3
- 238000009659 non-destructive testing Methods 0.000 description 3
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- 238000012545 processing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 244000241257 Cucumis melo Species 0.000 description 1
- 235000015510 Cucumis melo subsp melo Nutrition 0.000 description 1
- FJJCIZWZNKZHII-UHFFFAOYSA-N [4,6-bis(cyanoamino)-1,3,5-triazin-2-yl]cyanamide Chemical compound N#CNC1=NC(NC#N)=NC(NC#N)=N1 FJJCIZWZNKZHII-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000012850 discrimination method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
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- 230000000644 propagated effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The present invention discloses a portable watermelon quality tester. The present invention comprises two miniature microphones which are fixed to a bracket through leather bowls, a striking hammer is installed on the bracket through a hinge, one end of a spring is fixed to the bracket, the rod of the striking hammer above the spring is provided with a stop rod, the signal wires of the miniature microphones are connected with a microprocessor through a differential amplifier, an active filter and a comparator, and the microprocessor is connected with three light-emitting diodes in different colors. The measuring basis of the present invention is that in the ageing process of watermelons, the propagation rate of acoustic waves is decreased following the increase of the ripening degree. In a certain distance, the two microphones are arranged, acoustic waves are generated by striking the watermelon, measurement signals of the two microphones are recorded, the non-destructive detection is realized by measuring the propagation time of the acoustic wave signals so as to indirectly measure the propagation rate of the acoustic waves, and therefore, the ripening degree of the watermelon is determined, and the measuring results are represented by indicating lamps in different colors.
Description
Technical field
The present invention relates to a kind of device of energy Non-Destructive Testing watermelon degree of ripeness.Especially a kind of portable watermelon tester apparatus.
Background technology
The discrimination method of watermelon degree of ripeness is a lot, and modal is to beat the melon body with hand, judges its degree of ripeness by listening, and this method depends on operator's experience fully.In order to obtain a kind of comparatively objective, easy method of testing, carried out some researchs both at home and abroad:
Labeling acts:, over time, survey sample with destructive method to doing same label with the watermelon of a collection of artificial pollination.Obviously this is a kind of detection method that diminishes.
Unit weight method: judge its degree of ripeness by measuring the watermelon volume and weight.These class methods all are to use the volume and weight that watermelon is measured in the watermelon draining respectively, and the result of measurement or by pointer indication perhaps determines by tabling look-up.The method operation is comparatively complicated, is not suitable for the field and uses.
Resistance method: the degree of ripeness of judging watermelon by the resistivity of measuring watermelon.This also is a kind of detection method that diminishes.
Electronic equipment is distinguished method: this class methods example is more, all is the resonant frequency of measuring watermelon basically.Generally all collect sound by microphone, after operations such as amplifications, filtering, or computing machine provides measurement result by Computer Processing, or shows that with pointer instrument or loudspeaker export, and still needs artificial judgment.With regard to practicality, the former volume is excessive, the cost height, and the latter still has certain requirement to the operator.
Summary of the invention
The invention provides a kind of by impacting the portable watermelon tester apparatus that the watermelon surface produces sound wave and realizes Non-Destructive Testing watermelon degree of ripeness by the processing acoustic signals.
Technical scheme of the present invention is that it comprises: first, second midget microphone, be fixed on the support by leather cup respectively, the end of peening hammer by hinge, spring, the arresting lever that can plug are distinguished rack-mount, and the shaft of peening hammer can be installed between the other end and arresting lever of spring;
First, second midget microphone and first, second resistance are formed electric bridge, via first electric capacity, the 3rd resistance and the differential amplifier formed by second electric capacity, the 4th, the 5th, the 6th resistance and first amplifier, the active filter of being made up of the 7th, the 8th resistance, the 3rd electric capacity and second amplifier is by the 9th, the tenth, the comparer formed of the 11 resistance and the 3rd amplifier is connected to microprocessor.
Microprocessor and three different colours, can indicate respectively underdone, ripe, the overdone light emitting diode of watermelon respectively by the 12, the 13, the 14 resistance is connected three light emitting diode other end ground connection.
First differential amplifier, second differential amplifier, the 3rd differential amplifier are the LM324 integrated operational amplifier, and microprocessor is PIC12C508, and light emitting diode is red light emitting diodes, green LED, yellow light-emitting diode.
The invention has the beneficial effects as follows: in the maturation of watermelon, the propagation rate of sound wave can reduce along with the increase of degree of ripeness.Beasurement base of the present invention that Here it is.In certain distance, arrange two microphones, impact watermelon and produce sound wave, write down the measuring-signal of two microphones, by the indirect propagation rate of measuring sound wave of the travel-time of measuring acoustic signals, thus the degree of ripeness of definite watermelon.Realize Non-Destructive Testing, measurement result is represented by the pilot lamp of different colours.Can obtain the propagation rate of sound wave, thereby determine the degree of ripeness of watermelon.
Description of drawings
Fig. 1 is the outside drawing and the test synoptic diagram of portable watermelon tester apparatus.
Fig. 2 is the circuit diagram of portable watermelon tester apparatus.
Embodiment
As shown in Figure 1 and Figure 2, it comprises:
First, second midget microphone MIC1, MIC2, be fixed on the support 2 by leather cup 3 respectively, peening hammer 6 is installed on the support 2 by hinge 5, spring 4 one ends, the arresting lever 1 that can plug, and the shaft of peening hammer 6 can be installed between the other end and arresting lever 1 of spring 4;
First, second midget microphone MIC1, MIC2 and first, second resistance R 1, R2 form electric bridge, via first capacitor C 1, the 3rd resistance R 3 and the differential amplifier formed by second capacitor C 2, the 4th, the 5th, the 6th resistance R 4, R5, R6 and the first amplifier A1, by the active filter that the 7th, the 8th resistance R 7, R8, the 3rd capacitor C 3 and the second amplifier A2 form, the comparer of being made up of the 9th, the tenth, the 11 resistance R 9, R10, R11 and the 3rd amplifier A3 is connected to microprocessor.
Microprocessor and three different colours, can indicate watermelon underdone, ripe, overdone light emitting diode D1, D2, D3 to be connected by the 12, the 13, the 14 resistance R 12, R13, R14 respectively respectively, three light emitting diode D1, D2, D3 other end ground connection.
When depositing at ordinary times, peening hammer 6 is rotated in the counterclockwise direction, when being pressed onto to a certain degree, arresting lever 1 is inserted support, peening hammer 6 is hidden in the support under the acting in conjunction of spring 4 and arresting lever 1.During actual the test, portable watermelon tester apparatus is positioned over tested watermelon A top (see figure 1), suitably exert pressure, make leather cup 3 be close to tested watermelon surface, extract the arresting lever 1 that is contained on the support 2, discharge peening hammer 6 it is hit on the watermelon surface, produce sound, collected by midget microphone MIC1 and MIC2 when voice signal is propagated in watermelon.The signal that midget microphone MIC1 and MIC2 collect is sent into first amplifier (differential amplifier) A1 (referring to Fig. 2) and is amplified, again by second amplifier (active filter) A2 filtering and further amplification, signal after the amplification is input to the 3rd amplifier (comparer) A3, with a given voltage ratio, convert square-wave signal to.Because it is variant that sound wave arrives time of two MIC, once hit finish after, can obtain two square waves at the voltage comparator output terminal, square-wave signal is input to microprocessor PIC12C508, finishes measurement to two square wave front edge mistimings by this processor.Because the distance between two MIC is certain, the speed in the time of therefore should can representing sound wave to pass through two MIC the mistiming, and the latter can be reflected the degree of ripeness of watermelon.So also just measured the degree of ripeness of watermelon indirectly.Measurement result can be represented underdone, ripe, overdone respectively by lighting of light emitting diode D1 (redness), D2 (green), D3 (yellow).
Claims (2)
1, a kind of portable watermelon tester apparatus is characterized in that it comprises:
1) first, second midget microphone (MIC1, MIC2), be fixed on the support (2) by leather cup (3) respectively, peening hammer (6) is installed in respectively on the support (2) by an end of hinge (5), spring (4), the arresting lever (1) that can plug, and the shaft of peening hammer (6) can be installed between the other end and arresting lever (1) of spring (4);
2) first, second midget microphone (MIC1, MIC2) is formed electric bridge with first, second resistance (R1, R2), via first electric capacity (C1), the 3rd resistance (R3) and the differential amplifier formed by second electric capacity (C2), the 4th, the 5th, the 6th resistance (R4, R5, R6) and first amplifier (A1), the active filter of being made up of the 7th, the 8th resistance (R7, R8), the 3rd electric capacity (C3) and second amplifier (A2) is by the 9th, the tenth, the comparer formed of the 11 resistance (R9, R10, R11) and the 3rd amplifier (A3) is connected to microprocessor;
3) microprocessor and three different colours, can indicate respectively underdone, ripe, the overdone light emitting diode of watermelon (D1, D2, D3) respectively by the 12, the 13, the 14 resistance (R12, R13, R14) is connected three light emitting diodes (D1, D2, D3) other end ground connection.
2. portable watermelon tester apparatus according to claim 1, it is characterized in that: first amplifier (A1), second amplifier (A2), the 3rd amplifier (A3) are the LM324 integrated operational amplifier, microprocessor is PIC12C508, and light emitting diode is red light emitting diodes (D1), green LED (D2), yellow light-emitting diode (D3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021363781A CN1180253C (en) | 2002-08-03 | 2002-08-03 | Portable watermelon tester apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021363781A CN1180253C (en) | 2002-08-03 | 2002-08-03 | Portable watermelon tester apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1395097A CN1395097A (en) | 2003-02-05 |
| CN1180253C true CN1180253C (en) | 2004-12-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021363781A Expired - Fee Related CN1180253C (en) | 2002-08-03 | 2002-08-03 | Portable watermelon tester apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1180253C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101609068B (en) * | 2008-06-19 | 2011-11-09 | 林俊明 | Novel acoustic nondestructive test method |
| CN104062357B (en) * | 2014-05-23 | 2016-05-11 | 浙江大学 | Watermelon percussion vibration Multipoint synchronous measurement mechanism |
| CN107589175A (en) * | 2016-07-09 | 2018-01-16 | 石河子大学 | A kind of "Hami" melon maturity acoustics the cannot-harm-detection device |
-
2002
- 2002-08-03 CN CNB021363781A patent/CN1180253C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1395097A (en) | 2003-02-05 |
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