CN104155315A - Detection apparatus for online measurement of water content of grains based on radiofrequency transmission, and method thereof - Google Patents
Detection apparatus for online measurement of water content of grains based on radiofrequency transmission, and method thereof Download PDFInfo
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- CN104155315A CN104155315A CN201410407423.5A CN201410407423A CN104155315A CN 104155315 A CN104155315 A CN 104155315A CN 201410407423 A CN201410407423 A CN 201410407423A CN 104155315 A CN104155315 A CN 104155315A
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Abstract
The invention discloses a detection apparatus for online measurement of the water content of grains based on radiofrequency transmission, and a method thereof. The apparatus includes a detection antenna, a high frequency circuit and a low frequency circuit; the high frequency circuit comprises a signal generator generating a radio frequency signal, the signal generator is connected with a power divider, the power divider has a measuring signal output port and a local oscillator signal output port, the measuring signal output port is connected with the signal input end of the detection antenna, the local oscillator signal output port is connected with a demodulator, and the signal output end of the detection antenna is connected with a demodulator; and the low frequency circuit comprises a signal amplifier connected with the demodulator, a microprocessor circuit connected with the signal amplifier, and a display circuit connected with the microprocessor circuit. The detection apparatus has a wide measuring range, has a high measuring accuracy reaching 0.5% or 0.1%, makes the measurement uninfluenced by the water distribution due to the penetration property of the radiofrequency signal, can measure the water content of the surfaces of the grains, and can also measure the water content in the grains.
Description
Technical field
The present invention relates to grain moisture content detection technical field, especially, relate to a kind of pick-up unit and method of the on-line measurement grain moisture content based on radio frequency transmission.
Background technology
Grain, before transaction or storing, all needs to detect the water percentage of grain, and need to meet the requirement to water percentage of country or relevant unit.In order to make the grain that water percentage exceeds standard reduce water percentage, need to apply the grain drying device drying and processing that circulated, until reach requirement.In order to understand in real time the situation of change of grain moisture content in dryer equipment, and shut down in time after reaching water content requirement, with regard to needs, in real time grain moisture content is measured to detection online.
At present the online detection instrument of domestic and international application is mainly divided into and rolls measuring resistance method and capacitance method.Rolling measuring resistance method is by rolling gear, grain to be flattened, then measures its water percentage by the resistance measurement principle between two gears.Its advantage can be measured the moisture of cereal crops inside after being cereal crops to roll, and too complicated but shortcoming is structure, operation is trouble very.Because the individual size of different cereal crops there are differences, for example corn is more much bigger than millet, so also needs to regulate to roll gear distance, if adjust badly, directly affects measuring accuracy.After time length, meeting incrustation on gear, has affected the precision of measuring more in addition.
Capacitance method is to utilize between two parallel electrodes to have certain electric capacity, and capacitance is affected by the specific inductive capacity of medium between two electrodes, thereby by measuring electric capacity, calculate the water percentage of medium, this method is simple, but measuring accuracy is very low, and to the surface of cereal crops containing water sensitive, and moisture insensitive to inside can be caused very large measuring error.Capacitance and water percentage are not linear corresponding relations, in the segment limit of high water leg the variation of capacitance very small, so capacitance measurement is moisture can only under low moisture condition, adopt.
Summary of the invention
The object of the invention is to provide a kind of pick-up unit and method of the on-line measurement grain moisture content based on radio frequency transmission, and to solve in prior art, grain moisture content detection device structure is complicated, accuracy of detection problem very rambunctious.
For achieving the above object, the invention provides a kind of pick-up unit of the on-line measurement grain moisture content based on radio frequency transmission, comprising: detect antenna, high-frequency circuit and low-frequency channel; High-frequency circuit comprises the signal generator that produces radiofrequency signal, signal generator connects power splitter, power splitter has measuring-signal delivery outlet and local oscillation signal delivery outlet, measuring-signal delivery outlet connects the signal input part of measuring antenna, local oscillation signal delivery outlet connects detuner, and the signal output part of measuring antenna connects detuner; Low-frequency channel comprises the signal amplifier being connected with detuner, connects the microcontroller circuit of signal amplifier, and microcontroller circuit connects display circuit.
Further, detect antenna and comprise metal shell, in metal shell, be provided with two metal baffle; one nonmetallic antenna protection plate is set between two metal baffle; the side arrangement antenna of antenna protection plate, one end of antenna connects power splitter, and the other end connects detuner.
Further, metal baffle is consistent with the shape of antenna protection plate.
Further, one end of metal baffle and antenna protection plate is acute angle-shaped.
Further, antenna protection plate is polyimide plate or PVC(Polyvinyl chloride polymer, Polyvinylchloride) plate.
Further, signal generator is active crystal oscillator; Or, be DDS(Direct Digital Synthesizer, Direct Digital Synthesizer) and signal generator, DDS signal generator connects microprocessor.
Further, the frequency range of the radiofrequency signal of signal generator output is 125MHz-350MHz.
Further, the intensity of the measuring-signal of the measuring-signal delivery outlet of power splitter output is greater than the local oscillation signal of local oscillation signal delivery outlet output.
Further, detuner is IQ phase detector or width phase detuner; Microcontroller circuit is provided with communication interface.
The present invention also provides a kind of method of using above-mentioned pick-up unit on-line measurement grain moisture content, comprises the following steps:
First, demarcate in advance anhydrous phase differential P0 and pure water phase differential P1:
Anhydrous phase differential P0 is that pick-up unit is measured obtained phase differential under conventional environment, is defined as moisture 0% standard value;
Pure water phase differential P1 is that pick-up unit is measured obtained phase differential under water environment, is defined as moisture 100% standard value;
Then, by pick-up unit, detected medium is measured, obtained the poor X of radio-frequency (RF) phse of detected medium; Then, according to formula: detected media water-bearing rate u=(x-P0)/(P1-P0) calculate detected media water-bearing rate.
The present invention has following beneficial effect:
1, simple in structure, installation and easy for operation.
2, measurement range is wide, all can effectively measure, and have equal precision in the scope of 0-100%.
3, measuring accuracy is high, can reach 0.5% even 0.1%.
4, because radiofrequency signal has penetrability, so measure the impact that is not subject to moisture distribution, both can survey the water percentage on grain surface, also can survey the water percentage in grain.
Accompanying drawing explanation
Below with reference to figure, the present invention is further detailed explanation.The accompanying drawing that forms the application's a part is used to provide a further understanding of the present invention, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the theory diagram of pick-up unit preferred embodiment that the present invention is based on the on-line measurement grain moisture content of radio frequency transmission;
Fig. 2 is the theory diagram that the present invention is based on signal generator embodiment mono-in the pick-up unit preferred embodiment of on-line measurement grain moisture content of radio frequency transmission;
Fig. 3 is the theory diagram that the present invention is based on signal generator embodiment bis-in the pick-up unit preferred embodiment of on-line measurement grain moisture content of radio frequency transmission;
Fig. 4 is the theory diagram that the present invention is based on power splitter in the pick-up unit preferred embodiment of on-line measurement grain moisture content of radio frequency transmission;
Fig. 5 the present invention is based on the diagrammatic cross-section of measuring antenna in the pick-up unit preferred embodiment of on-line measurement grain moisture content of radio frequency transmission;
Fig. 6 the present invention is based on the front schematic view of measuring antenna in the pick-up unit preferred embodiment of on-line measurement grain moisture content of radio frequency transmission;
Fig. 7 is the theory diagram that the present invention is based on detuner embodiment mono-in the pick-up unit preferred embodiment of on-line measurement grain moisture content of radio frequency transmission;
Fig. 8 is the theory diagram that the present invention is based on detuner embodiment bis-in the pick-up unit preferred embodiment of on-line measurement grain moisture content of radio frequency transmission;
Fig. 9 is the theory diagram that the present invention is based on microcontroller circuit in the pick-up unit preferred embodiment of on-line measurement grain moisture content of radio frequency transmission.
Description of reference numerals:
100, detect antenna; 200, high-frequency circuit; 300, low-frequency channel; 101, metal shell; 102, metal baffle; 103, antenna protection plate; 104, antenna; 201, signal generator; 202, power splitter; 203, detuner; 301, microcontroller circuit; 302, signal amplifier; 303, display circuit; 304, communication interface.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated.
Refer to Fig. 1, Fig. 4 and Fig. 9, the preferred embodiments of the present invention provide a kind of pick-up unit of the on-line measurement grain moisture content based on radio frequency transmission, comprising: detect antenna 100, high-frequency circuit 200 and low-frequency channel 300; High-frequency circuit 200 comprises the signal generator 201 that produces radiofrequency signal, signal generator 201 connects power splitter 202, power splitter 202 has measuring-signal delivery outlet and local oscillation signal delivery outlet, measuring-signal delivery outlet connects the signal input part of measuring antenna 100, local oscillation signal delivery outlet connects detuner 203, and the signal output part of measuring antenna 100 connects detuner 203; Low-frequency channel comprises the signal amplifier 302 being connected with detuner 203, connects the microcontroller circuit 301 of signal amplifier 302, and microcontroller circuit 301 connects display circuit 303.
The pick-up unit of the on-line measurement grain moisture content based on radio frequency transmission that this preferred embodiment provides, its specific implementation process is as follows:
While detecting, by signal generator 201, produce high-frequency radio frequency signal, radiofrequency signal is divided into two-way by power splitter 202, and a road inputs to detuner 203 as local oscillation signal; Another road by detecting antenna 100 through measured medium, then inputs to detuner 203 as measuring-signal; Detuner 203 output two-way direct current signals are to signal amplifier 302, signal amplifier 302 carries out low-pass filtering amplification to this two-way direct current signal, and deliver to microcontroller circuit 301 and carry out analog to digital conversion, the low frequency phase difference that obtains two signals, then shows measurement data by display circuit 303.The specific inductive capacity of dry grain itself is very high, when in grain, water percentage is higher, its reduced dielectric constant, because the radiofrequency signal through measured grain can produce phase shift with the variation of medium specific inductive capacity, so can obtain by detecting the phase differential of measuring-signal and local oscillation signal the numerical value of corresponding water percentage.This structure of the detecting device is simple, installation and easy for operation.Measurement range is wide, all can effectively measure, and have equal precision in the scope of 0-100%, can reach 0.5% even 0.1%.Because radiofrequency signal has penetrability, so measure the impact that is not subject to moisture distribution, both can survey the water percentage on grain surface, also can survey the water percentage in grain.
Refer to Fig. 5 and Fig. 6; detect antenna and comprise metal shell 101; in metal shell 101, be provided with two metal baffle 102; one nonmetallic antenna protection plate 103 is set between two metal baffle 102; the side arrangement antenna 104 of antenna protection plate 103; one end of antenna 104 connects power splitter 202, and the other end connects detuner 203.Metal baffle 102 is consistent with the shape of antenna protection plate 103.Metal baffle 102 is acute angle-shaped with one end of antenna protection plate 103.Antenna protection plate 103 is polyimide plate or PVC plate.Metal baffle 102 is consistent with the shape of antenna protection plate 103, and object is effectively to guarantee to form between antenna 104 and metal baffle 102 the loop of rf, thereby guarantees the reliable and stable of measuring-signal.Metal baffle 102 is acute angle-shaped with one end of antenna protection plate 103, can guarantee that impurity (for example, straw) can not tangled or cling measurement antenna.Antenna 104 is arranged in a side of nonmetallic materials antenna protection plate 103, and its object one is for fear of antenna 104 wearing and tearing, is by the white space of fill antenna 104 on the other hand, avoids impurity (for example, straw) in grain etc. to hang on antenna 104.The antenna protection plate 103 of protection antenna 104 can adopt polyimide or PVC material, and insulating property and intensity are all higher.
Refer to 2 and Fig. 3, signal generator 201 can adopt active crystal oscillator; Also can adopt DDS signal generator, DDS signal generator connects microprocessor.Two kinds of signal generators are applied in different occasions.Active crystal oscillator volume is little, and frequency stable output cannot be changed but frequency and signal intensity are fixing, so be applicable to being applied in batch production and equipment volume is required to high occasion.DDS signal generator connects microprocessor, can be by microprocessor control break frequency or output signal strength, so be applicable to being applied in test or special measurement occasion.Simultaneously, the intensity of the radiofrequency signal of measuring selects to depend on the length restriction of antenna and the moisture variation range of measured medium, for grain measuring media, in an embodiment, the frequency range of the radiofrequency signal of signal generator 201 outputs is comparatively preferred scheme between 125MHz-350MHz.In measuring process, the measuring-signal of the measuring-signal delivery outlet of power splitter 202 output has certain decay in testing process; Therefore,, in actual measurement, the intensity of measuring-signal is greater than the local oscillation signal of (being slightly larger than) local oscillation signal delivery outlet output.
Refer to Fig. 1, Fig. 7 and Fig. 8, detuner 203 can adopt IQ phase detector, also can adopt width phase detuner.IQ phase detector becomes I road and Q road low frequency direct current signal by the quadrature demodulation of two-way input signal, then by calculating Amplitude Ratio and phase signal after microcontroller circuit sample conversion.Width phase detuner (the width phase demodulator chip of AD8302 model) directly demodulates Amplitude Ratio direct current signal He Yi road, a road phase differential direct current signal by two-way input signal.If in the use occasion of needs high-precision wide temperature, adopt IQ phase detector.In common low-cost occasion, adopt width phase detuner.In addition, microcontroller circuit 301 is provided with communication interface 304, and by communication interface 304, this pick-up unit can connect other external equipment or host computer.
The present invention also provides a kind of method of using above-mentioned pick-up unit on-line measurement grain moisture content, comprises the following steps:
First, demarcate in advance anhydrous phase differential P0 and pure water phase differential P1:
Anhydrous phase differential P0 is that pick-up unit is measured obtained phase differential under conventional environment, is defined as moisture 0% standard value;
Pure water phase differential P1 is that pick-up unit is measured obtained phase differential under water environment, is defined as moisture 100% standard value;
Then, by pick-up unit, detected medium is measured, obtained the poor X of radio-frequency (RF) phse of detected medium; Because the water percentage of the poor X of radio-frequency (RF) phse and measured medium becomes more satisfactory linear relationship, therefore can be according to formula: detected media water-bearing rate u=(x-P0)/(P1-P0) calculate detected media water-bearing rate.
Detected media water-bearing rate u be take volume and is calculated as unit, if need to draw and take the water percentage that quality is unit, the conventional density by various different mediums calculates acquisition.
As can be seen from the above description, the above embodiments of the present invention have realized following technique effect:
This structure of the detecting device is simple, installation and easy for operation.Measurement range is wide, all can effectively measure, and have equal precision in the scope of 0-100%, can reach 0.5% even 0.1%.Because radiofrequency signal has penetrability, so measure the impact that is not subject to moisture distribution, both can survey the water percentage on grain surface, also can survey the water percentage in grain.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention; For a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a pick-up unit for the on-line measurement grain moisture content based on radio frequency transmission, is characterized in that, comprising:
Detect antenna, high-frequency circuit and low-frequency channel;
Described high-frequency circuit comprises the signal generator that produces radiofrequency signal, described signal generator connects power splitter, described power splitter has measuring-signal delivery outlet and local oscillation signal delivery outlet, described measuring-signal delivery outlet connects the signal input part of described measurement antenna, described local oscillation signal delivery outlet connects detuner, and the signal output part of described measurement antenna connects described detuner;
Described low-frequency channel comprises the signal amplifier being connected with described detuner, connects the microcontroller circuit of described signal amplifier, and described microcontroller circuit connects display circuit.
2. the pick-up unit of the on-line measurement grain moisture content based on radio frequency transmission according to claim 1, is characterized in that:
Described detection antenna comprises metal shell; in described metal shell, be provided with two metal baffle; one nonmetallic antenna protection plate is set between two described metal baffle; the side arrangement antenna of described antenna protection plate; one end of described antenna connects described power splitter, and the other end connects described detuner.
3. the pick-up unit of the on-line measurement grain moisture content based on radio frequency transmission according to claim 2, is characterized in that:
Described metal baffle is consistent with the shape of described antenna protection plate.
4. the pick-up unit of the on-line measurement grain moisture content based on radio frequency transmission according to claim 3, is characterized in that:
One end of described metal baffle and described antenna protection plate is acute angle-shaped.
5. the pick-up unit of the on-line measurement grain moisture content based on radio frequency transmission according to claim 2, is characterized in that:
Described antenna protection plate is polyimide plate or PVC plate.
6. the pick-up unit of the on-line measurement grain moisture content based on radio frequency transmission according to claim 1, is characterized in that:
Described signal generator is active crystal oscillator; Or, be DDS signal generator, described DDS signal generator connects microprocessor.
7. the pick-up unit of the on-line measurement grain moisture content based on radio frequency transmission according to claim 6, is characterized in that:
The frequency range of the described radiofrequency signal of described signal generator output is 125MHz-350MHz.
8. the pick-up unit of the on-line measurement grain moisture content based on radio frequency transmission according to claim 7, is characterized in that:
The intensity of the measuring-signal of the described measuring-signal delivery outlet output of described power splitter is greater than the local oscillation signal of described local oscillation signal delivery outlet output.
9. the pick-up unit of the on-line measurement grain moisture content based on radio frequency transmission according to claim 1, is characterized in that:
Described detuner is IQ phase detector or width phase detuner; Described microcontroller circuit is provided with communication interface.
10. use a method for pick-up unit on-line measurement grain moisture content as claimed in any one of claims 1-9 wherein, it is characterized in that, comprise the following steps:
First, demarcate in advance anhydrous phase differential P0 and pure water phase differential P1:
Described anhydrous phase differential P0 is that described pick-up unit is measured obtained phase differential under conventional environment, is defined as moisture 0% standard value;
Described pure water phase differential P1 is that described pick-up unit is measured obtained phase differential under water environment, is defined as moisture 100% standard value;
Secondly, by described pick-up unit, detected medium is measured, obtained the poor X of radio-frequency (RF) phse of detected medium; Then, according to formula: detected media water-bearing rate u=(x-P0)/(P1-P0) calculate detected media water-bearing rate.
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| CN104713892A (en) * | 2015-04-03 | 2015-06-17 | 江苏麦赫物联网科技有限公司 | Modularized radio-frequency sensing electric field oil storage tank water-containing liquid level detection device and method |
| CN104713891A (en) * | 2015-04-03 | 2015-06-17 | 江苏麦赫物联网科技有限公司 | Device and method for detecting content of moisture and temperature in grain depot by employing modular radio frequency induction electric field |
| CN107238609A (en) * | 2017-05-18 | 2017-10-10 | 孟敏 | Icing frosting detection device and method based on microwave |
| CN109459450A (en) * | 2018-12-26 | 2019-03-12 | 江苏麦赫物联网科技有限公司 | A kind of moisture content and conductivity sensing system and detection method |
| CN109470311A (en) * | 2018-12-17 | 2019-03-15 | 吉林大学 | A kind of double hidden probe-type silo grain multi-parameter RF on-line measuring device and detection methods |
| CN112198173A (en) * | 2020-09-22 | 2021-01-08 | 上海欧申科技有限公司 | Wireless monitoring device for measuring water content of logging drilling fluid and control method thereof |
| CN113504251A (en) * | 2021-08-13 | 2021-10-15 | 河南工业大学 | Grain moisture rapid detection method and system based on radio frequency signals |
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| CN104713892A (en) * | 2015-04-03 | 2015-06-17 | 江苏麦赫物联网科技有限公司 | Modularized radio-frequency sensing electric field oil storage tank water-containing liquid level detection device and method |
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| CN109470311A (en) * | 2018-12-17 | 2019-03-15 | 吉林大学 | A kind of double hidden probe-type silo grain multi-parameter RF on-line measuring device and detection methods |
| CN109459450A (en) * | 2018-12-26 | 2019-03-12 | 江苏麦赫物联网科技有限公司 | A kind of moisture content and conductivity sensing system and detection method |
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| CN109459450B (en) * | 2018-12-26 | 2023-12-19 | 江苏麦赫物联网科技有限公司 | Water content and conductivity detection system and detection method |
| CN112198173A (en) * | 2020-09-22 | 2021-01-08 | 上海欧申科技有限公司 | Wireless monitoring device for measuring water content of logging drilling fluid and control method thereof |
| CN113504251A (en) * | 2021-08-13 | 2021-10-15 | 河南工业大学 | Grain moisture rapid detection method and system based on radio frequency signals |
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