CN105116015A - Testing method and device for ion concentration in vegetable or fruit - Google Patents
Testing method and device for ion concentration in vegetable or fruit Download PDFInfo
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- CN105116015A CN105116015A CN201510505580.4A CN201510505580A CN105116015A CN 105116015 A CN105116015 A CN 105116015A CN 201510505580 A CN201510505580 A CN 201510505580A CN 105116015 A CN105116015 A CN 105116015A
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Abstract
The invention provides a testing method and device for ion concentration in a vegetable or fruit. The testing method and device are used for testing the ion concentration in the vegetable or fruit to be tested. The testing method comprises the steps that a first probe and a second probe are inserted into the vegetable or fruit to be tested; a first-frequency alternating signal is applied on the first probe and the second probe; a phase difference between a first voltage of the two ends of the first probe and the second probe and a first current flowing through the first probe and the second probe is acquired; the ion concentration in the vegetable or fruit to be tested can be calculated and obtained according to a preset formula. The testing method is simple in operation principle and low in device cost, and many times of testing further proves that the testing method is high in precision, reliable and rapid to use.
Description
Technical field
The present invention relates to ion concentration detection field, particularly relate to a kind of detection method and device of vegetables and fruits ion concentration.
Background technology
Vegetables and fruits are subject to the impact such as agricultural chemicals of soil environment, fertilizer and sprinkling in developmental process, easily cause nitrate ions residual a large amount of in its body, and the height of nitrate ion concentration can not be checked out by the appearance of vegetables and fruits, people are easily converted into nitrite ion in vivo and enter blood after eating the vegetables and fruits containing a large amount of nitrate ion, easily cause poisoning time serious.Therefore people need accurately to monitor the sub-ion concentration of nitric acid in vegetables and fruits.
In order to accurately obtain the concentration of nitrate ion in vegetables and fruits, prior art adopts the concentration of ion mass spectrometry test nitrate ion usually in the lab, Measuring Time about 30 minutes.Although experimental result is accurate, but use for laboratory ion mass spectrometry is expensive, due to the expensive complex structure of instrument price, instrument principle of work is complicated, ordinary people is difficult to application test, and the cost once tested can, higher than the price buying vegetables and fruits, carry out testing cost too high, and the test duration be oversize to ordinary people.
Summary of the invention
In view of this, the object of the embodiment of the present invention is the detection method and the device that provide a kind of vegetables and fruits ion concentration, to solve the problem that prior art vegetables and fruits ion concentration measurement cost is high and Measuring Time is long.
The invention provides a kind of detection method of vegetables and fruits ion concentration, for measuring the ion concentration in vegetables and fruits to be measured, comprising the steps:
The first probe and the second probe is inserted in described vegetables and fruits to be measured; The alternating signal of first frequency is applied on described first probe and described second probe; Obtain the phase differential of the first voltage and the first electric current, described first voltage is the voltage at described first probe and described second probe two ends, and described first electric current is the electric current flowing through described first probe and described second probe; Calculate according to preset formula and obtain the ion concentration in described vegetables and fruits to be measured.
Particularly, the step obtaining the phase differential of described first voltage and the first electric current comprises: the first voltage measuring described first probe and described second probe two ends; Measure ohmically second voltage of connecting with described first probe and described second probe; Calculate the phase differential of described first voltage and described second voltage.
Particularly, preset formula is y=x
1+ x
2s+x
3s
2, wherein s is described phase differential, x
1, x
2, x
3for coefficient of multiple correlation.
Particularly, the frequency of described alternating signal is between 0.1HZ to 100KHZ.
Present invention also offers a kind of pick-up unit of vegetables and fruits ion concentration, for measuring the ion concentration in vegetables and fruits to be measured, comprise probe module, alternating signal provides module, voltage-phase acquisition module, current phase acquisition module and processing unit; Described probe module comprises for inserting the first probe in described vegetables and fruits to be measured and the second probe; Described alternating signal provides module on described first probe and described second probe, apply the alternating signal of first frequency; Described voltage-phase acquisition module is for obtaining the phase place of first voltage at described first probe and described second probe two ends; Described current phase acquisition module is for obtaining the phase place of the first electric current flowing through described first probe and described second probe; Described processing unit, for obtaining the phase differential of the first voltage and the first electric current according to the phase place of the first voltage and the phase place of the first electric current, and calculates according to preset formula and obtains the ion concentration in described vegetables and fruits to be measured.
Particularly, device also comprises the resistance R0 connected with described first probe and the second probe; Described first probe and alternating signal provide the output terminal of module to be connected, and described second probe is connected with the first end of resistance R0, the second end ground connection of described resistance R0; Second voltage-phase at current phase acquisition module measuring resistance R0 two ends; Described processing unit obtains described phase differential according to the phase calculation of the phase place of described first voltage and described second voltage.
Particularly, described first voltage acquisition module is the first operational amplifier, and the in-phase input end of described first operational amplifier is connected with described first probe, and the reverse input end of described first operational amplifier is connected with described second probe; Described second voltage acquisition module is the second operational amplifier, and the in-phase input end of described second operational amplifier is connected with the first end of described resistance RO, and the reverse input end of described second operational amplifier is connected with second end of described resistance R0; Described processing unit comprises analog to digital conversion circuit and processor, wherein the input end of analog to digital conversion circuit is connected with described second operational amplifier output terminal with the output terminal of described first operational amplifier respectively, the output terminal of analog-digital conversion circuit as described is connected with described processor, and described first voltage and described second voltage transitions are the digital signal that processor can process by analog-digital conversion circuit as described.
Particularly, described alternating signal provides module to comprise generator and the 3rd operational amplifier, described generator is for providing alternating signal, the in-phase input end of described 3rd operational amplifier is connected with the output terminal of described generator, the inverting input of described 3rd operational amplifier is connected with the output terminal of described first operational amplifier, and the output terminal of described 3rd operational amplifier provides the output terminal of module to be connected with described first probe as alternating signal.
Particularly, described processor has built-in communication module, and the ion concentration result of described vegetables and fruits to be measured is sent to terminal device by described communication module.
Particularly, described device also comprises the indicator for display device running status be connected with processor.
The detection method of vegetables and fruits ion concentration provided by the invention and device, by inserting the first probe and the second probe in described vegetables and fruits to be measured; The alternating signal of first frequency is applied on described first probe and described second probe; The phase differential of the first voltage obtaining described first probe and described second probe two ends and the first electric current flowing through described first probe and described second probe; Can calculate according to preset formula and obtain the ion concentration in described vegetables and fruits to be measured.This method principle of work is simple, and installation cost is low, and many experiments also proves that detection method precision is high, reliable, quick.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of vegetables and fruits ion concentration detection method in embodiment of the present invention;
Fig. 2 is the process flow diagram obtaining the first voltage and the first current phase difference method in embodiment of the present invention;
Fig. 3 is the schematic equivalent circuit of vegetables and fruits to be measured after insertion first probe and the second probe;
Fig. 4 is the phase place schematic diagram of the first voltage and the first electric current
Fig. 5 is the calibration curve that the nitrate ion of banana measures;
Fig. 6 is the calibration curve that the nitrate ion of pumpkin measures;
Fig. 7 is the testing result comparison diagram adopting the present invention and ion mass spectrometry;
Fig. 8 is the theory diagram of vegetables and fruits ion concentration pick-up unit in embodiment of the present invention;
Fig. 9 is the physical circuit figure of a kind of vegetables and fruits ion concentration of the present invention pick-up unit.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The specific embodiment of the invention provides a kind of detection method of vegetables and fruits ion concentration, for measuring the ion concentration in vegetables and fruits to be measured, as the concentration of nitrate ion.As shown in Figure 1, the method is completed by the pick-up unit of vegetables and fruits ion concentration, mainly comprises the steps:
S101, in described vegetables and fruits to be measured, insert the first probe and the second probe;
Particularly, described vegetables and fruits to be measured are vegetables containing moisture or fruit, as wax gourd, cucumber, banana, apple etc.After determining vegetables and fruits to be measured, directly by a pair probe, i.e. the first probe and the second probe, is inserted in described vegetables and fruits to be measured.
As shown in Figure 3, for inserting the schematic equivalent circuit of vegetables and fruits to be measured after the first probe and the second probe.After inserting the first probe and the second probe, vegetables and fruits to be measured are specifically equivalent to the circuit be made up of resistance R1, resistance R2 and electric capacity C, and wherein resistance R1 and resistance R2 connects, and electric capacity C is parallel to the two ends of resistance R2.This detection method be by means of electric capacity C at 10KHZ to 10
5during alternating current frequency between KHZ, the electric conductivity of corresponding ion concentration realizes detecting ion concentration.Detecting an important parameter of ion concentration is, the voltage at above-mentioned a pair probe two ends and flow through above-mentioned a pair probe electric current between phase differential.As shown in Figure 4, the phase place schematic diagram of the first voltage and the first electric current.The voltage being applied to the first probe and the second probe two ends is waveform B, and the electric current flowing through the first probe and the second probe is waveform C, and namely the phase differential θ between voltage waveform B and current waveform C is because the ion in vegetables and fruits to be measured causes.
S102, on described first probe and described second probe, apply the alternating signal of first frequency;
When testing different vegetables and fruits, the first frequency of the alternating signal of applying is not necessarily identical, but it has certain value restriction.Preferably, described alternating signal is voltage signal, and its first frequency is between 0.1HZ to 100KHZ, and namely the span of first frequency is [0.1HZ, 0.1KHZ].Discovery is studied according to inventor, in the low frequency range of frequency lower than 0.1HZ, not phase shift between aforementioned first voltage and the first electric current, therefore and be not suitable for the present invention.
S103, obtain the phase differential of the first voltage and the first electric current, described first voltage is the voltage at described first probe and described second probe two ends, and described first electric current is the electric current flowing through described first probe and described second probe;
Particularly, the voltage at above-mentioned a pair probe two ends, is first voltage at the first probe and the second probe two ends; The above-mentioned electric current flowing through above-mentioned a pair probe, is the first electric current flowing through described first probe and described second probe; Therefore, an important parameter of detection ion concentration is the phase differential between the first voltage and the first electric current.
S104, to calculate according to preset formula and to obtain the ion concentration in described vegetables and fruits to be measured.
Particularly, at the above-mentioned important parameter of acquisition, the phase differential namely between the first voltage and the first electric current, after above-mentioned important parameter can be substituted in preset formula to obtain the ion concentration in described vegetables and fruits to be measured.
The detection method of a kind of vegetables and fruits ion concentration provided by the invention, only inserts the first probe and the second probe in described vegetables and fruits to be measured; The alternating signal of first frequency is applied on described first probe and described second probe; The phase differential of the first voltage obtaining described first probe and described second probe two ends and the first electric current flowing through described first probe and described second probe; Can calculate according to preset formula and obtain the ion concentration in described vegetables and fruits to be measured.This method principle of work is simple, and accordingly, installation cost is lower, and many experiments also proves that detection method precision of the present invention is high, reliable, quick, is no more than the ion concentration that can test out for 6 seconds in fruit to be measured, as the concentration of nitrate ion.
See Fig. 2, be a kind of process flow diagram obtaining above-mentioned first voltage and the first current phase difference method in the step S103 that provides, mainly comprise the steps:
S201, measure first voltage at described first probe and described second probe two ends;
Ohmically second voltage that S202, measurement are connected with described first probe and described second probe;
S203, calculate the phase differential of described first voltage and described second voltage.
Particularly, because resistance is connected with the first probe and the second probe, flow through described first probe identical with the electric current flowing through resistance with the first electric current of described second probe, the voltage at resistance two ends is identical with the phase place of the electric current flowing through resistance, by measuring second voltage at above-mentioned resistance two ends, the phase differential of the first voltage calculated and described second voltage, is the phase differential between the first voltage and the first electric current.
Above-mentioned first voltage of the acquisition that the present embodiment provides and the first current phase difference method are simple and easy in realization, and the precision of the phase differential obtained is high.
In step S104, preset formula is y=x
1+ x
2s+x
3s
2, wherein s is described phase differential, x
1, x
2, x
3for coefficient of multiple correlation.Described x
1, x
2, x
3the calibration curve that can be measured by the nitrate ion of vegetables and fruits to be measured is obtained, and the longitudinal axis of calibration curve represents the content of nitrate ion in every kilogram of vegetables and fruits, the dimensionless number of transverse axis representative voltage and current and phase difference.Described preset formula and the different curve corresponding to different vegetables and fruits and coefficient of multiple correlation thereof are x
1, x
2and x
3all be stored in the processor of pick-up unit.
The calibration curve that the nitrate ion of different vegetables and fruits measures is different, and the calibration curve that described vegetables and fruits nitrate ion measures can be obtained by test of many times.For cucumber, after selecting a cucumber, obtain the phase differential s of voltage and current with method of the present invention and device
1(dimensionless number in described calibration curve transverse axis can be obtained), by prior art, as methods such as use for laboratory ion mass spectrometry or Ion Density Measurement Instrument devices (patent that such as publication number is CN202041488U, title is the ion measurer of biologics), obtain the content y of nitrate ion in every kilogram of cucumber in the calibration curve longitudinal axis
1, a test point (s in curve map can be obtained like this
1, y
1); Similar, select other two cucumber test respectively and obtain two other test point (s
2, y
2) and (s
3, y
3), utilize polynomial interpolation to pass through to bring the data of above-mentioned 3 test points into formula y=x respectively
1+ x
2s+x
3s
2in can obtain coefficient of multiple correlation x
1, x
2and x
3value, thus obtain nitrate ion measure calibration curve y=x
1+ x
2s+x
3s
2.At the calibration curve y=x that the nitrate ion obtaining cucumber measures
1+ x
2s+x
3s
2after, then bring the phase differential of the first voltage and the first electric current that utilize method of the present invention to test and obtain cucumber to be measured into nitrate ion concentration that this preset formula can obtain this cucumber to be measured.
It should be noted that, when testing the calibration curve of the nitrate ion mensuration obtaining certain class vegetables and fruits, described test point is at least 3, namely at least tests any 3 samples of such vegetables and fruits; When quantity n>=3 of described test point time, can only select 3 test points wherein to calculate calibration curve, or selection part as required bring polynomial expression y=x into
1+ x
2s+x
3s
2+ ... x
ns
(n-1)middle acquisition coefficient of multiple correlation x
1, x
2..., x
n, the data obtained like this can be more accurate, but test number (TN) is more, and obtain coefficient of multiple correlation more complicated, the preferred coefficient of multiple correlation of the application is 3, i.e. x
1, x
2and x
3.
To calculate the nitrate ion concentration of banana to be measured, the calibration curve that the nitrate ion with reference to Fig. 5 banana measures, can obtain above-mentioned x by curve
1=95, x
2=125, x
3=225, the phase differential S=0.67 calculated if aforementioned, then the concentration calculating nitrate ion in banana is
y＝x
1+x
2s+x
3s
2＝95+125×0.67+225×0.67
2＝279.75。
See Fig. 6, the calibration curve that the nitrate ion for pumpkin measures, can obtain corresponding x by this curve
1, x
2and x
3, then the nitrate ion of pumpkin can be obtained according to method of the present invention.Similar, the nitrate ion concentration of other vegetables and fruits such as wax gourd, cucumber, apple can also be calculated.The comparison diagram of the result that inventor is obtained by the nitrate ion concentration value and ion mass spectrometry adopting detection method many experiments of the present invention acquisition, see Fig. 7.Result is known by experiment, the precision of the nitrate ion concentration obtained according to method of the present invention is high, and due to test speed of the present invention fast, be no more than 6 seconds, method of the present invention is more simple compared with ion mass spectrometry detection method, and therefore market application foreground of the present invention is larger.
Present invention also offers a kind of pick-up unit of vegetables and fruits ion concentration, for measuring the ion concentration in vegetables and fruits to be measured, see Fig. 8, it comprises probe module 11, alternating signal provides module 12, voltage-phase acquisition module 13, current phase acquisition module 14 and processing unit 15; Wherein, probe module 11 comprises for inserting the first probe 11a in described vegetables and fruits to be measured and the second probe 11b; Alternating signal provides module 12 on described first probe 11a and described second probe 11b, apply the alternating signal of first frequency; Voltage-phase acquisition module 13 is for obtaining the phase place of first voltage at described first probe 11a and described second probe 11b two ends; Described current phase acquisition module 14 is for obtaining the phase place of the first electric current flowing through described first probe 11a and described second probe 11b; Described processing unit 15, for obtaining the phase differential of the first voltage and the first electric current according to the phase place of the first voltage and the phase place of the first electric current, and calculates according to preset formula and obtains the ion concentration in described vegetables and fruits to be measured.
The pick-up unit of a kind of vegetables and fruits ion concentration provided by the invention, only inserts the first probe 11a and the second probe 11b in described vegetables and fruits to be measured; The alternating signal of first frequency is applied on described first probe 11a and described second probe 11b; The phase differential of the first voltage obtaining described first probe 11a and described second probe 11b two ends and the first electric current flowing through described first probe 11a and described second probe 11b; Can calculate according to preset formula and obtain the ion concentration in described vegetables and fruits to be measured.This method principle of work is simple and installation cost is lower, and many experiments also proves that detection method precision of the present invention is high, reliable, quick, is no more than the ion concentration that can test out for 6 seconds in fruit to be measured, as the concentration of nitrate ion.
See Fig. 9, for the embodiment of the pick-up unit of a kind of vegetables and fruits ion concentration provided by the invention, the first probe 11a in probe module 11 and described second probe 12b is all inserted in vegetables and fruits to be measured, first probe 11a and alternating signal provide the output terminal of module 12 to be connected, described second probe 11b is connected with the first end of resistance R0, the second end ground connection of described resistance R0; Second voltage-phase at current phase acquisition module measuring resistance R0 two ends; Described processing unit 15 obtains described phase differential according to the phase calculation of the phase place of described first voltage and described second voltage.
Because resistance R0 connects with the first probe 11a and the second probe 11b, flow through described first probe 11a identical with the electric current flowing through resistance R0 with first electric current of described second probe 11b, the voltage at resistance R0 two ends is identical with the phase place of the electric current flowing through resistance R0, by measuring second voltage at above-mentioned resistance R0 two ends, the phase differential of the first voltage calculated and described second voltage, be the phase differential between the first voltage and the first electric current, be embodied in the phase differential θ of waveform B and waveform C in calculating chart 4.
Particularly, the first voltage acquisition module is the first operational amplifier B1, and the in-phase input end of the first operational amplifier B1 is connected with described first probe 11a, and the reverse input end of the first operational amplifier B1 is connected with described second probe 11b; Second voltage acquisition module is the second operational amplifier B2, and the in-phase input end of the second operational amplifier B2 is connected with the first end of described resistance RO, and the reverse input end of the second operational amplifier B2 is connected with second end of described resistance R0; Processing unit 15 comprises analog to digital conversion circuit and processor, wherein the input end of analog to digital conversion circuit is connected with described second operational amplifier B2 output terminal with the output terminal of described first operational amplifier B1 respectively, the output terminal of analog to digital conversion circuit is connected with processor, described first voltage and described second voltage transitions are the digital signal that processor can process by analog-digital conversion circuit as described, can improve the accuracy of detection.
First voltage and the second voltage differential amplification are sent to processor after being converted to digital signal by above-mentioned first operational amplifier B1 and the second operational amplifier B2 respectively, are calculated the ion concentration of vegetables and fruits to be measured by processor according to the data received.
Processor first obtains phase differential s according to the phase place of the first voltage obtained and the phase calculation of the second voltage, then calculates acquisition ion concentration according to preset formula, and preset formula is y=x
1+ x
2s+x
3s
2, wherein s is described phase differential, x
1, x
2, x
3for coefficient of multiple correlation.Described preset formula and the different curve corresponding to different vegetables and fruits and coefficient of multiple correlation thereof are x
1, x
2and x
3all be stored in the processor of pick-up unit.Obtain coefficient of multiple correlation x
1, x
2, x
3and the method for preset formula describes in detail in front portion, does not repeat them here.
For banana, the calibration curve that the nitrate ion with reference to Fig. 5 banana measures can obtain, above-mentioned x
1=95, x
2=125, x
3=225, the phase differential S=0.67 calculated if aforementioned, then the concentration calculating nitrate ion in banana is
y＝x
1+x
2s+x
3s
2＝95+125×0.67+225×0.67
2＝279.75。
See Fig. 6, the calibration curve that the nitrate ion for pumpkin measures, can obtain the nitrate ion of pumpkin according to method of the present invention.Similar, the nitrate ion concentration of wax gourd, cucumber, apple etc. can also be calculated.Inventor passes through the comparison diagram of the result obtained with nitrate ion concentration value and the ion mass spectrometry of method many experiments acquisition of the present invention, see Fig. 7.Result is known by experiment, and the precision of the nitrate ion concentration obtained according to method of the present invention is high, and due to test speed of the present invention fast, be no more than 6 seconds, therefore market application foreground of the present invention is larger.
Particularly, alternating signal provides module 12 to comprise generator G and the 3rd operational amplifier B3, described generator G provides the alternating signal of first frequency, the in-phase input end of the 3rd operational amplifier B3 is connected with the output terminal of described generator G, the inverting input of the 3rd operational amplifier B3 is connected with the output terminal of the first operational amplifier B1, and the output terminal of the 3rd operational amplifier B3 provides the output terminal of module 12 to be connected with described first probe 11a as alternating signal.
3rd operational amplifier B3 is in REPEATER STATE, and it is in order to the 3rd operational amplifier B3 can normally be exported that the inverting input of the 3rd operational amplifier B3 is connected with the output terminal of the first operational amplifier B1.The frequency of alternating signal is between 0.1HZ to 100KHZ, and namely the span of the first frequency of described alternating signal is [0.1HZ, 0.1KHZ].Discovery is studied according to inventor, in the low frequency range of frequency lower than 0.1HZ, not phase shift between aforementioned first voltage and the first electric current, therefore and be not suitable for the present invention.
Preferably, processor has built-in communication module, and the ion concentration result of described vegetables and fruits to be measured is sent to terminal device, as mobile phone, panel computer etc. by described communication module.After the ion concentration completing vegetables and fruits to be measured detects, testing result is passed through communication module by processor, bluetooth module, GPRS module, wifi module etc. as wireless telecommunications realize the module of data transmission, send to the terminal device of user, are convenient to user and check, preserve or edit test result.
Preferably, described device also comprises the indicator for display device running status, and indicator is connected with processor, and user can according to the display state of indicator, as the change of display color, monitor the current state of testing process and this device, parameter and test data etc.Concrete, indicator can be light emitting diode, keyboard or display, such as liquid crystal display etc.
In addition, one of ordinary skill in the art will appreciate that all or part of step realized in the various embodiments described above method is that the hardware that can carry out instruction relevant by program has come, corresponding program can be stored in computer read/write memory medium, described storage medium, as ROM/RAM, disk or CD etc.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a detection method for vegetables and fruits ion concentration, for measuring the ion concentration in vegetables and fruits to be measured, is characterized in that, comprising the steps:
The first probe and the second probe is inserted in described vegetables and fruits to be measured;
The alternating signal of first frequency is applied on described first probe and described second probe;
Obtain the phase differential of the first voltage and the first electric current, described first voltage is the voltage at described first probe and described second probe two ends, and described first electric current is the electric current flowing through described first probe and described second probe;
Calculate according to preset formula and obtain the ion concentration in described vegetables and fruits to be measured.
2. the detection method of vegetables and fruits ion concentration according to claim 1, is characterized in that, the step obtaining the phase differential of described first voltage and the first electric current comprises:
Measure first voltage at described first probe and described second probe two ends;
Measure ohmically second voltage of connecting with described first probe and described second probe;
Calculate the phase differential of described first voltage and described second voltage.
3. the detection method of vegetables and fruits ion concentration according to claim 1 and 2, is characterized in that, described preset formula is
y＝x
1+x
2s+x
3s
2；
Wherein s is described phase differential, x
1, x
2, x
3for coefficient of multiple correlation.
4. the detection method of vegetables and fruits ion concentration according to any one of claim 1 to 3, is characterized in that, the frequency of described alternating signal is between 0.1HZ to 100KHZ.
5. a pick-up unit for vegetables and fruits ion concentration, for measuring the ion concentration in vegetables and fruits to be measured, is characterized in that, comprises probe module, alternating signal provides module, voltage-phase acquisition module, current phase acquisition module and processing unit;
Described probe module comprises for inserting the first probe in described vegetables and fruits to be measured and the second probe;
Described alternating signal provides module on described first probe and described second probe, apply the alternating signal of first frequency;
Described voltage-phase acquisition module is for obtaining the phase place of first voltage at described first probe and described second probe two ends;
Described current phase acquisition module is for obtaining the phase place of the first electric current flowing through described first probe and described second probe;
Described processing unit, for obtaining the phase differential of the first voltage and the first electric current according to the phase place of the first voltage and the phase place of the first electric current, and calculates according to preset formula and obtains the ion concentration in described vegetables and fruits to be measured.
6. the pick-up unit of vegetables and fruits ion concentration according to claim 5, is characterized in that, described device also comprises the resistance R0 connected with described first probe and the second probe;
Described first probe and alternating signal provide the output terminal of module to be connected, and described second probe is connected with the first end of resistance R0, the second end ground connection of described resistance R0;
Second voltage-phase at current phase acquisition module measuring resistance R0 two ends;
Described processing unit obtains described phase differential according to the phase calculation of the phase place of described first voltage and described second voltage.
7. the pick-up unit of vegetables and fruits ion concentration according to claim 6, is characterized in that,
Described first voltage acquisition module is the first operational amplifier, and the in-phase input end of described first operational amplifier is connected with described first probe, and the reverse input end of described first operational amplifier is connected with described second probe;
Described second voltage acquisition module is the second operational amplifier, and the in-phase input end of described second operational amplifier is connected with the first end of described resistance RO, and the reverse input end of described second operational amplifier is connected with second end of described resistance R0;
Described processing unit comprises analog to digital conversion circuit and processor, wherein the input end of analog to digital conversion circuit is connected with described second operational amplifier output terminal with the output terminal of described first operational amplifier respectively, the output terminal of analog-digital conversion circuit as described is connected with described processor, and described first voltage and described second voltage transitions are the digital signal that processor can process by analog-digital conversion circuit as described.
8. the pick-up unit of vegetables and fruits ion concentration according to claim 7, it is characterized in that, described alternating signal provides module to comprise generator and the 3rd operational amplifier, described generator is for providing alternating signal, the in-phase input end of described 3rd operational amplifier is connected with the output terminal of described generator, the inverting input of described 3rd operational amplifier is connected with the output terminal of described first operational amplifier, and the output terminal of described 3rd operational amplifier provides the output terminal of module to be connected with described first probe as alternating signal.
9. the pick-up unit of the vegetables and fruits ion concentration according to claim 7 or 8, is characterized in that, described processor has built-in communication module, and the ion concentration result of described vegetables and fruits to be measured is sent to terminal device by described communication module.
10. the pick-up unit of the vegetables and fruits ion concentration according to any one of claim 7 to 9, is characterized in that, described device also comprises the indicator for display device running status be connected with processor.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106770516A (en) * | 2016-12-07 | 2017-05-31 | 深圳绿食宝科技有限公司 | The measuring method and its measuring system of nitrate ion content in a kind of biological product |
| CN109959685A (en) * | 2019-03-26 | 2019-07-02 | 深圳绿食宝科技有限公司 | Method and system for measuring nitrate ion content in biological product |
| CN110398515A (en) * | 2018-07-26 | 2019-11-01 | 刘茂诚 | Vegetables and fruits nitrate detection device and its method |
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| CN110398515A (en) * | 2018-07-26 | 2019-11-01 | 刘茂诚 | Vegetables and fruits nitrate detection device and its method |
| CN109959685A (en) * | 2019-03-26 | 2019-07-02 | 深圳绿食宝科技有限公司 | Method and system for measuring nitrate ion content in biological product |
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