CN203025139U - Portable nondestructive peach maturity testing device - Google Patents

Portable nondestructive peach maturity testing device Download PDF

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Publication number
CN203025139U
CN203025139U CN 201320002909 CN201320002909U CN203025139U CN 203025139 U CN203025139 U CN 203025139U CN 201320002909 CN201320002909 CN 201320002909 CN 201320002909 U CN201320002909 U CN 201320002909U CN 203025139 U CN203025139 U CN 203025139U
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CN
China
Prior art keywords
resistance
circuit
signal
peach
consist
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN 201320002909
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Chinese (zh)
Inventor
王剑平
毛建华
盖玲
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Zhejiang University ZJU
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Zhejiang University ZJU
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Priority to CN 201320002909 priority Critical patent/CN203025139U/en
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Publication of CN203025139U publication Critical patent/CN203025139U/en
Expired - Fee Related legal-status Critical Current
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Abstract

The utility model discloses a portable nondestructive peach maturity testing device. A fixed base is arranged in a metallic shielding box, a slide bar which is vertical to the fixed base is arranged in the middle of one side of the fixed base, a movable base and the fixed base are parallel to each other and arranged on the slide bar, one end of a movable metal clip is arranged on the slide bar between the two bases while the other end of the movable metal clip is provided with a rubber tray, two parallel install grooves are respectively formed in the long sides of the fixed and movable bases, and two plate electrodes are respectively arranged in the grooves and connected with a control circuit. Before a test, a peach is put on the rubber tray, and the positions of the parallel plate electrodes and the rubber tray are adjusted to ensure that the plate electrodes are in close contact with the peach. A sine wave with specific frequency is added to the plate electrodes by the embedded controller, and the parameters of equivalent impedance modulus, phases, capacitance and inductance of the parallel plate electrodes can be measured through an internal circuit. The electrical parameters of peaches with different maturities greatly differ, and thus the maturities of the peaches can be measured.

Description

A kind of portable peach degree of ripeness the cannot-harm-detection device
Technical field
The utility model relates to a kind of Non-Destructive Testing fruit proving installation, especially relates to a kind of portable peach degree of ripeness the cannot-harm-detection device.
Background technology
Peach is one of important Common Fruits of China, market to the high request of quality make we must to peach postpartum links carry out degree of ripeness and detect.The traditional detection method of fruit maturity is mainly by range estimation and feel, judges degree of ripeness according to its color and quality, and the method depends on individual's experience, poor accuracy fully.Setting up aspect a kind of objective, harmless, method of quick and precisely detecting fruit maturity, carried out some researchs both at home and abroad, mainly contain:
Near infrared spectroscopy: method is determined the characteristic wavelength of fruit by experiment, then carry out the absorption spectra analysis under this characteristic wavelength, can determine the degree of ripeness indexs such as its sugar content, titratable acid content, but because the penetration range of near infrared light is short, can't test whole degree of ripeness, measuring accuracy is restricted.
The machine vision method: at the visible/near infrared wave band to the fruit imaging, adopt image processing, analytical technology and computer communication technology, determine the degree of ripeness of fruit by appearance index such as color, volume, hardness, but owing to can only or approaching surperficial regional imaging to fruit surface, the accuracy of test is affected, and cost is larger.
Hammering method: knock fruit surface by rubber mallet, determine the degree of ripeness of fruit according to the sound spectrum feature that receives, this method is easy to operate, and cost is lower, but is vulnerable to the interference of external sound and affects test result.
The Electronic Nose method: the specific scent of sending when ripe by detection by electronic nose fruit is judged the degree of ripeness of fruit, and this method is simple to operate, and is highly sensitive, but only can be for specific fruit and characteristic odour, and test fruit variety scope is narrower.
Summary of the invention
The purpose of this utility model is to provide a kind of portable peach degree of ripeness the cannot-harm-detection device.Utilize this device can realize to the peach degree of ripeness quick and precisely, Non-Destructive Testing, and can show the result that detects by liquid crystal display.
For achieving the above object, the technical solution adopted in the utility model is:
The utility model comprises firm banking, mobile base, rubber pallet, live metal folder, sliding bar, control circuit, Shielded Twisted Pair, two plate electrodes, metallic shield case; In the metallic shield case, firm banking is housed, one middle side part of firm banking is equipped with the sliding bar vertical with firm banking, mobile base is parallel with firm banking and be arranged on sliding bar, one end of live metal folder is arranged on sliding bar between mobile base and firm banking, the other end of live metal folder is for installing the rubber pallet of peach, the long limit of firm banking and mobile base all has a parallel mounting groove, in two mounting grooves, the one flat plate electrode is installed all, two plate electrodes Shielded Twisted Pair on binding post respectively are connected with control circuit.
Described control circuit: comprise series circuit, signal conditioning circuit, liquid crystal display that equiva lent impedance Z that embedded controller, DDS sine-wave generator, voltage buffer amplifier circuit, plate electrode and peach consist of and measuring resistance Rb form; The output signal Vi of DDS sine-wave generator is connected to the voltage buffer amplifier circuit, and the output signal Vs of voltage buffer amplifier circuit links the series circuit of resistance R b and equiva lent impedance Z formation, also is connected with the input end of signal conditioning circuit simultaneously; Resistance R b is connected another input end of signal conditioning circuit with the mid point signal Vo of equiva lent impedance Z series circuit, simultaneously this signal input end of analog signal of input analog-to-digital converter also; Two output end signal Vo1, Vo2 of signal conditioning circuit connect respectively two counter input ends of embedded controller; The digital output end of analog to digital converter is connected with the digital input signals end of embedded controller respectively, and the digital signal input end of liquid crystal display is connected with the digital signal output end of embedded controller.
Described voltage buffer amplifier circuit: comprise the voltage follower that capacitor C 1 is connected with resistance R 1 afterwards and amplifier U1 consists of; Resistance R 2, resistance R 3, thermistor Rt1, resistance R 4, capacitor C 6, triode Q1 consist of base stage partial pressure type total radio amplifier; Resistance R 5, resistance R 7, resistance R 9, triode Q2 consist of the single tube emitter follower; Resistance R 6, capacitor C 7 consist of negative-feedback circuit.
Described signal conditioning circuit: comprise that resistance R 8, resistance R 9, diode D1, diode D2, comparer U2A consist of the zero passage voltage comparer of simple gate limit; The in-phase proportion discharge circuit that resistance R 12, resistance R 13, resistance R 16 and amplifier U2B consist of; Resistance R 10, resistance R 11, diode D3, diode D4, comparer U3A consist of the zero-crossing comparator of simple gate limit; The in-phase proportion operational amplifier that resistance R 14, resistance R 15, resistance R 17, amplifier U3B consist of amplifies; Capacitor C 10, capacitor C 11 be as filter capacitor, filtering high frequency noise signal.
The beneficial effect that the utlity model has is:
1, with low cost, easy to carry, detect fast, do not damage peach.
2, detect that affected by the external environment factor little, the test result accuracy is high.
Description of drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is schematic block circuit diagram of the present utility model.
Fig. 3 is the circuit theory diagrams of voltage buffer amplifier circuit of the present utility model.
Fig. 4 is the circuit theory diagrams of the signal conditioning circuit in the utility model.
In figure: 1, firm banking, 2, mounting groove, 3, the rubber pallet, 4, the live metal folder, 5, control circuit, 6, mobile base, 7, sliding bar, 8, the metallic shield case, 9, Shielded Twisted Pair, 10, plate electrode, 11, binding post.
Embodiment
The utility model will be further described below in conjunction with drawings and Examples.
as shown in Figure 1, the utility model comprises firm banking 1, mobile base 6, rubber pallet 3, live metal folder 4, sliding bar 7, control circuit 5, Shielded Twisted Pair 9, two plate electrodes 10, metallic shield case 8, firm banking 1 is housed in metallic shield case 8, one middle side part of firm banking 1 is equipped with the sliding bar vertical with firm banking 17, mobile base 6 is parallel with firm banking 1 and be arranged on sliding bar 7, one end of live metal folder 4 is arranged on the sliding bar 7 of 1 of mobile base 6 and firm banking, the other end of live metal folder 4 is for installing the rubber pallet 3 of peach, the long limit of firm banking 1 and mobile base 6 all has a parallel mounting groove 2, in two mounting grooves, the one flat plate electrode is installed all, two plate electrodes Shielded Twisted Pair on binding post respectively are connected with control circuit.
As shown in Figure 2, be schematic block circuit diagram of the present utility model, comprise series circuit, signal conditioning circuit, liquid crystal display that equiva lent impedance Z that embedded controller, DDS sine-wave generator, voltage buffer amplifier circuit, plate electrode and peach consist of and measuring resistance Rb form; The output signal Vi of DDS sine-wave generator is connected to the voltage buffer amplifier circuit, and the output signal Vs of voltage buffer amplifier circuit links the series circuit of resistance R b and equiva lent impedance Z formation, also is connected with the input end of signal conditioning circuit simultaneously; Resistance R b is connected another input end of signal conditioning circuit with the mid point signal Vo of equiva lent impedance Z series circuit, simultaneously this signal input end of analog signal of input analog-to-digital converter also; Two output end signal Vo1, Vo2 of signal conditioning circuit connect respectively two counter input ends of embedded controller; The digital output end of analog to digital converter is connected with the digital input signals end of embedded controller respectively, and the digital signal input end of liquid crystal display is connected with the digital signal output end of embedded controller.
As shown in Figure 2, the principle of work of circuit of the present utility model is: at first sending control signal by embedded controller, to make the DDS sine-wave generator produce frequency be the sine wave signal Vi of f.The voltage buffer amplifier circuit carries out power amplification to this sine wave signal and obtains output voltage V s, and Vs is connected to the equiva lent impedance Z that formed by parallel plate electrode and peach and the two ends up and down of preferred circuit series circuit that Rb consists of.Equiva lent impedance Z sends on the one hand analog to digital converter with the voltage signal Vo that is connected midpoint of resistance R b and changes into digital signal output, is connected with the embedded controller digital input end, and controller calculates the voltage magnitude V of signal by program; Vo input signal conditioning circuit together with the output signal Vs of voltage buffer amplifier circuit also simultaneously.The zero passage comparator circuit of signal conditioning circuit inside obtained two-way square-wave output signal Vo1, Vo2 after respectively the two-way input signal being carried out zero balancing, the counting input end of input embedded controller, the time difference of being calculated this two paths of signals by the controller internal counter , according to the phase difference calculating formula Calculate phase differential
By voltage V and the phase differential that calculates , controller can calculate the equiva lent impedance Z of parallel plate electrode and peach.According to the degree of ripeness of the peach of prior foundation and the mould of equiva lent impedance Z , the forecast model between shunt capacitance Cp and Lp, calculated the degree of ripeness of peach by embedded controller.The degree of ripeness index comprises soluble solid (SSC), titratable acid (TA) and water cut, all shows by liquid crystal display.
As shown in Figure 3, be the circuit theory diagrams of voltage buffer amplifier circuit of the present utility model.The sinusoidal signal Vi that DDS produces connects input capacitance C1, filtering the high frequency interference composition in Vi; Capacitor C 1 is connected with the resistance R 1 rear voltage follower that consists of with amplifier U1 of series connection; Resistance R 2, resistance R 3, thermistor Rt1, resistance R 4, capacitor C 6, triode Q1 consist of base stage partial pressure type total radio amplifier, when ambient temperature rises, the resistance of the thermistor Rt1 of negative temperature coefficient reduces thereupon, thereby the quiescent point of keeping total radio amplifier is constant; Resistance R 5, resistance R 7, resistance R 9, triode Q2 consist of the single tube emitter follower; When the voltage parallel negative-feedback circuit that resistance R 6, capacitor C 7 consist of guarantees that output voltage V s is constant, also subtracted output resistance; Potentiometer R2 can be used for regulating the quiescent point of triode Q1.
Triode Q1 in Fig. 3, triode Q2 can adopt the compatible casts such as 9013 or 8050.Voltage follower can adopt the lower amplifier of this price of uA741.
As shown in Figure 4, be the circuit theory diagrams of the signal conditioning circuit in the utility model.Resistance R 8, resistance R 9, diode D1, diode D2, comparer U2A consist of the zero passage voltage comparer of simple gate limit, the output voltage V o input zero-crossing comparator of the mid point of the series circuit that parallel plate electrode equiva lent impedance Z and measuring resistance Rb are formed carried out zero balancing, be connected to due to diode D1, diode D2 reverse parallel connection between the homophase input and inverting input of comparer U2A, prevented the interference of near zero-crossing point, the output signal of comparer U2A is square wave; The in-phase proportion amplifier that resistance R 12, resistance R 13, resistance R 16 and amplifier U2B consist of is amplified the output square-wave signal of comparer U2A, and will export the counter input end that Vo1 is input to embedded controller; In like manner resistance R 10, resistance R 11, diode D3, diode D4, comparer U3A consist of the zero-crossing comparator of simple gate limit, the output signal Vs of voltage buffer amplifier circuit is inputted the square-wave signal that zero-crossing comparator is exported more afterwards, the in-phase proportion operational amplifier that is input to resistance R 14, resistance R 15, resistance R 17, amplifier U3B formation amplifies, and the output signal Vo2 after amplification is input to another counting input end of embedded controller; Capacitor C 10, capacitor C 11 be as filter capacitor, filtering high frequency noise signal.
Diode D1 in Fig. 4, diode D2, diode D3, diode D4 all can adopt the ordinary silicon diode, and comparer can be selected LM393.
In Fig. 3+15V with-two groups of direct supplys of 15V are independent DC power supply, need to connect altogether, in Fig. 4+the 5V power supply produces by 7805 Voltage stabilizing modules by+15V, embedded controller and analog to digital converter also all employings+5V power.
Embedded controller in the utility model adopts ARM cortex-M3 series processors, and sine-wave generator is take synthetic (DDS) chip AD9850 of Direct Digital as core, and analog to digital converter considers that precision and cost adopt 10 serial ADC chip TLC1549.

Claims (4)

1. portable peach degree of ripeness the cannot-harm-detection device, it is characterized in that: comprise firm banking (1), mobile base (6), rubber pallet (3), live metal folder (4), sliding bar (7), control circuit (5), Shielded Twisted Pair (9), two plate electrodes (10), metallic shield case (8), firm banking (1) is housed in metallic shield case (8), one middle side part of firm banking (1) is equipped with the sliding bar (7) vertical with firm banking (1), mobile base (6) is parallel with firm banking (1) and be arranged on sliding bar (7), one end of live metal folder (4) is arranged on sliding bar (7) between mobile base (6) and firm banking (1), the other end of live metal folder (4) is for installing the rubber pallet (3) of peach, the long limit of firm banking (1) and mobile base (6) all has a parallel mounting groove (2), in two mounting grooves, the one flat plate electrode is installed all, two plate electrodes Shielded Twisted Pair on binding post respectively are connected with control circuit.
2. a kind of portable peach degree of ripeness the cannot-harm-detection device according to claim 1, it is characterized in that: described control circuit comprises series circuit, signal conditioning circuit, liquid crystal display that equiva lent impedance Z that embedded controller, DDS sine-wave generator, voltage buffer amplifier circuit, plate electrode and peach consist of and measuring resistance Rb form; The output signal Vi of DDS sine-wave generator is connected to the voltage buffer amplifier circuit, and the output signal Vs of voltage buffer amplifier circuit links the series circuit of resistance R b and equiva lent impedance Z formation, also is connected with the input end of signal conditioning circuit simultaneously; Resistance R b is connected another input end of signal conditioning circuit with the mid point signal Vo of equiva lent impedance Z series circuit, simultaneously this signal input end of analog signal of input analog-to-digital converter also; Two output end signal Vo1, Vo2 of signal conditioning circuit connect respectively two counter input ends of embedded controller; The digital output end of analog to digital converter is connected with the digital input signals end of embedded controller respectively, and the digital signal input end of liquid crystal display is connected with the digital signal output end of embedded controller.
3. a kind of portable peach degree of ripeness the cannot-harm-detection device according to claim 2 is characterized in that: described voltage buffer amplifier circuit, comprise capacitor C 1 connect with resistance R 1 after with the voltage follower of amplifier U1 formation; Resistance R 2, resistance R 3, thermistor Rt1, resistance R 4, capacitor C 6, triode Q1 consist of base stage partial pressure type total radio amplifier; Resistance R 5, resistance R 7, resistance R 9, triode Q2 consist of the single tube emitter follower; Resistance R 6, capacitor C 7 consist of negative-feedback circuit.
4. a kind of portable peach degree of ripeness the cannot-harm-detection device according to claim 2, it is characterized in that: described signal conditioning circuit comprises that resistance R 8, resistance R 9, diode D1, diode D2, comparer U2A consist of the zero passage voltage comparer of simple gate limit; The in-phase proportion discharge circuit that resistance R 12, resistance R 13, resistance R 16 and amplifier U2B consist of; Resistance R 10, resistance R 11, diode D3, diode D4, comparer U3A consist of the zero-crossing comparator of simple gate limit; The in-phase proportion operational amplifier that resistance R 14, resistance R 15, resistance R 17, amplifier U3B consist of amplifies; Capacitor C 10, capacitor C 11 be as filter capacitor, filtering high frequency noise signal.
CN 201320002909 2013-01-05 2013-01-05 Portable nondestructive peach maturity testing device Expired - Fee Related CN203025139U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201320002909 CN203025139U (en) 2013-01-05 2013-01-05 Portable nondestructive peach maturity testing device

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Application Number Priority Date Filing Date Title
CN 201320002909 CN203025139U (en) 2013-01-05 2013-01-05 Portable nondestructive peach maturity testing device

Publications (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103076366A (en) * 2013-01-05 2013-05-01 浙江大学 Portable NDT (nondestructive testing) device for peach maturity
CN108254511A (en) * 2016-12-28 2018-07-06 南宁市浩发科技有限公司 A kind of jackfruit maturity detection device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103076366A (en) * 2013-01-05 2013-05-01 浙江大学 Portable NDT (nondestructive testing) device for peach maturity
CN108254511A (en) * 2016-12-28 2018-07-06 南宁市浩发科技有限公司 A kind of jackfruit maturity detection device

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C14 Grant of patent or utility model
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20130626

Termination date: 20150105

EXPY Termination of patent right or utility model