CN102759546A - Device and method for detecting water content of grain in on-line manner on basis of radio frequency identification (RFID) - Google Patents
Device and method for detecting water content of grain in on-line manner on basis of radio frequency identification (RFID) Download PDFInfo
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- CN102759546A CN102759546A CN2011101069015A CN201110106901A CN102759546A CN 102759546 A CN102759546 A CN 102759546A CN 2011101069015 A CN2011101069015 A CN 2011101069015A CN 201110106901 A CN201110106901 A CN 201110106901A CN 102759546 A CN102759546 A CN 102759546A
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Abstract
The invention discloses a device and a method for detecting the water content of grain in an on-line manner on the basis of radio frequency identification (RFID). The device comprises a reader-writer, an active electronic tag, a first linear movement sensor, a second linear movement sensor, a third linear movement sensor, a vertical guide rail, a slide block, a horizontal connecting rod, a controller, a housing and a control module. According to the device and the method disclosed by the invention, the active electronic tag buried below the surface of a to-be-detected grain bulk is utilized, and through observing the response situation of the active electronic tag and conducting corresponding calculation, the water content of the grain bulk is indirectly reflected. The device and the method have the advantages that the operation is simple and convenient while certain test precision is guaranteed, and test results can be obtained in an on-line manner, so that the device and the method have certain economic benefits.
Description
Technical field
The present invention relates to electronic information field, relate in particular to a kind of device and method based on the technological online detection accumulating grain moisture content content of radio frequency identification (RFID).
Background technology
Moisture is the key index of grain quality, directly influences the process such as purchase, transportation, storage, processing, trade of grain.Moisture content in grain can be divided into tie water (water of crystallization) and free water (free water) by physical property.Tie water forms in grain grain growth course naturally, is present in the grain cell, combines very firmly with grain intragranular hydrophilic substance, and character is very stable, and tie water is not participated in conduction; Free water is to condense upon in the inner kapillary of grain and the moisture in the molecule gap through physisorption, and it has the conduction property of light water, and the moisture that detects at ordinary times refers to free water.If buy and grain reservation indiscriminately, will inevitably influence the storage cycle of grain, cause the mouldy too early, rotten, rotten of grain, therefore must take notice of the moisture of grain constantly.
When grain purchases stand in purchase grain, will detect the humidity of grain earlier, traditional detection method is to adopt sample oven dry weight method.At present at home during grain purchases, touch that tooth is stung or traditional detection method is judged the moisture of grain with hand, exist measure that the result is extremely unreliable, detection time problem such as length, wasting manpower and material resources.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of apparatus and method of the online detection grain moisture content content based on radio frequency identification; Utilization is embedded in the active electronic label under the grain heap to be measured surface; Response condition through the observation active electronic label; And, reflect the pile water content of putting out cereal indirectly through corresponding calculating.
In order to achieve the above object; The invention provides a kind of device of the online detection grain moisture content content based on radio frequency identification; Comprise: read write line, active electronic label, the first straight line movable sensor, the second straight line movable sensor, the 3rd straight line movable sensor, vertical guide rail, slide block, horizontal brace rod, controller, housing and control module, wherein:
Said read write line is equipped with antenna on it, be electrically connected with said control module;
Said read write line sends signal to said control module in real time, and whether this signal carries said read write line can receive the information from the answer signal of said active electronic label;
Said active electronic label passes through the horizontal brace rod physical connection with said vertical guide rail;
The line of the phase center of said antenna and the phase center of said active electronic label is with the last perpendicular of grain heap;
The said first straight line movable sensor, the said second said straight line movable sensor are individually fixed on the said vertical guide rail, wherein,
The height of the phase center of the antenna of the said height of the first straight line movable sensor on said vertical guide rail and said read write line is identical;
The height of the said second straight line movable sensor on said vertical guide rail is identical with the height of grain horizontal surface;
Distance between said first straight line movable sensor and the said second straight line movable sensor is used to identify the antenna of said read write line and the relative position between the grain horizontal surface;
Said slide block is embedded in the said vertical guide rail, and is connected with said controller, and said slide block can be free to slide along said vertical track below said straight line movable sensor according to the instruction of said controller;
Said the 3rd straight line movable sensor is bound to said slide block, and said the 3rd straight line movable sensor and said slide block are synchronous;
Said slide block drives said active electronic label through said horizontal brace rod and moves up and down synchronously, said active electronic label of spacing characterizing between said the 3rd straight line movable sensor and the said second straight line movable sensor and the spacing between the grain horizontal surface;
Said housing is used to store grain heap to be measured, and said active electronic label places under the upper surface of said enclosure interior grain heap; Said read write line, said vertical guide rail, the said first straight line movable sensor, the said second straight line movable sensor, said the 3rd straight line movable sensor, said slide block, said controller and said control module all are positioned at outside; Said horizontal brace rod penetrates said housing, makes the active electronic label of said enclosure interior and the slide block of said outside link;
Said control module is connected with said controller, the said first straight line movable sensor, the said second straight line movable sensor and said the 3rd straight line movable sensor respectively;
Said control module is according to the data from the said first straight line movable sensor, the said second straight line movable sensor and said the 3rd straight line movable sensor; Obtain the antenna of current read write line and the distance between the active electronic label, and send instruction to control moving of said slide block to said controller according to this distance;
The antenna of the read write line when said control module is exchanged between " said read write line can receive the answer signal from said active electronic label " and " said read write line can not receive the answer signal from said active electronic label " according to the information that should carry from the signal of said read write line and the distance between the active electronic label; And the calibration regression curve of storing in advance, obtain current grain moisture content content.
During enforcement, said control module comprises interconnective middleware and host computer;
Said host computer is connected with said controller;
Said middleware; Be connected with said read write line, the said first straight line movable sensor, said the 3rd straight line movable sensor of the said second straight line movable sensor respectively; Be used to receive and handle the data that said read write line, the said first straight line movable sensor, the said second straight line movable sensor and said the 3rd straight line movable sensor are uploaded, and the data after will handling are sent to said host computer.
During enforcement, said read write line is a 433MHz band RFID read write line, and said active electronic label is a 433MHz band RFID active electronic label.
The present invention also provides a kind of method of the online detection grain moisture content content based on radio frequency identification, and it may further comprise the steps based on above-mentioned device:
Step 1: read write line sends signal to control module in real time, the information from the answer signal of said active electronic label that this signal carries whether said read write line can receive;
Step 2: said control module is sent instruction to control moving of said slide block according to the data from the said first straight line movable sensor, the said second straight line movable sensor and said the 3rd straight line movable sensor to said controller;
Step 3: when this information of carrying from the signal of said read write line is exchanged, turn to step 4 between " said read write line can receive the answer signal from said active electronic label " and " said read write line can not receive the answer signal from said active electronic label ";
Step 4: said control module is according to current data from the said first straight line movable sensor, the said second straight line movable sensor and said the 3rd straight line movable sensor; Measure the antenna of read write line and the distance between the active electronic label; Said control module according to this distance and in advance the storage the calibration regression curve, obtain current grain moisture content content.
During enforcement, step 4 may further comprise the steps:
Step 41; Control module is according to current data from the said first straight line movable sensor, the said second straight line movable sensor and said the 3rd straight line movable sensor; Measure the antenna of read write line and the distance between the active electronic label, calculate the DIELECTRIC CONSTANTS of current grain layer
r
Step 42, control module is according to current grain layer DIELECTRIC CONSTANTS
r, and the calibration regression curve of storage in advance, obtain the moisture of current grain layer.
During enforcement, said read write line is a 433MHz band RFID read write line, and said active electronic label is a 433MHz band RFID active electronic label.
Compared with prior art, the apparatus and method of the online detection grain moisture content content based on radio frequency identification of the present invention can be when guaranteeing certain measuring accuracy, and are easy and simple to handle, and can the online test result that provides, and have certain economic benefits.
Description of drawings
Fig. 1 is the structural drawing of a specific embodiment of the device of the online detection grain moisture content content based on radio frequency identification of the present invention;
Fig. 2 is the process flow diagram of a specific embodiment of the method for the online detection grain moisture content content based on radio frequency identification of the present invention.
Embodiment
In recent years, because the development of sensor technology, computer technology, very large scale integration technology and the network communications technology makes grain feelings detection technique at aspects such as hardware and software certain development arranged all.For online accurate detection grain moisture content, the present invention provides a kind of apparatus and method of the online detection grain moisture content content based on radio frequency identification, and is easy and simple to handle when guaranteeing measuring accuracy, can provide testing result in real time.Particularly the current wireless REID is in the extensive application of grain depot accumulating link, and the universal RFID system detects grain moisture content content, can extra increase large number quipments cost.At present; Rfid system commonly used in the world is operated in ISM (Industrial, Scientific and Medical) mostly; The 433MHz frequency range often is used to short haul connection device and radio amateur's frequency range, need not apply for specially, and this device and method versatility is stronger; Shorten the design cycle effectively, had stronger actual operation.
The invention provides a kind of device and method of the online detection grain moisture content content based on radio frequency identification.
Moisture content in grain content is big more, and the specific inductive capacity of grain is just big more, and in like manner, the specific inductive capacity of grain is big more, and then corresponding moisture is high more.The present invention is through measuring the specific inductive capacity of grain, contained humidity in the grain what provides indirectly, i.e. moisture.
As shown in Figure 1; The device of the online detection grain moisture content content based on radio frequency identification of the present invention comprises: read write line 1, active electronic label 2, straight line movable sensor 3, straight line movable sensor 4, straight line movable sensor 5, vertical guide rail 6, slide block 7, horizontal brace rod 8, controller 9, housing 12 and control module, wherein:
Said read write line 1 is equipped with antenna 1-2 on it, be electrically connected with said control module;
Said read write line 1 sends signal to said control module in real time, and whether this signal carries said read write line 1 can receive the information from the answer signal of said active electronic label 2;
Said active electronic label 2 passes through horizontal brace rod 8 physical connections with said vertical guide rail 6;
The line of the phase center of the phase center of said antenna 1-2 and said active electronic label 2 is with the last perpendicular of grain heap;
Said straight line movable sensor 3, said straight line movable sensor 4 are individually fixed in the relevant position on the said vertical guide rail 6, wherein,
The height of the phase center of the antenna 1-2 of the height of said straight line movable sensor 3 on said vertical guide rail 6 and said read write line 1 is identical;
The height of said straight line movable sensor 4 on said vertical guide rail 6 is identical with the height of grain horizontal surface;
Distance between said straight line movable sensor 3 and the said straight line movable sensor 4 is used to identify the antenna 1-2 of said read write line 1 and the relative position d1 between the grain horizontal surface;
Said slide block 7 is embedded in the said vertical guide rail 6, and is connected with said controller 9, and said slide block 7 can be free to slide along said vertical track 6 below said straight line movable sensor 4 according to the instruction of said controller 9;
Said straight line movable sensor 5 is bound to said slide block 7, and said straight line movable sensor 5 and said slide block 7 are synchronous;
Said slide block 7 drives said active electronic label 2 through said horizontal brace rod 8 and moves up and down said active electronic label 2 of spacing characterizing between said straight line movable sensor 5 and the said straight line movable sensor 4 and the spacing d2 between the grain horizontal surface synchronously;
Said housing 12 is used to store grain heap to be measured; Wherein active electronic label 2 places under the upper surface of said housing 12 inner grain heaps; For the ease of operation; Said read write line 1, said antenna 1-2, said vertical guide rail 6, said straight line movable sensor 3, said straight line movable sensor 4, said straight line movable sensor 5, said slide block 7, said controller 9 and said control module all are positioned at housing 12 outsides.Horizontal brace rod 8 penetrates housing 12, makes housing 12 inner active electronic labels 2 link with housing 12 outside slide blocks 7.
Said control module is connected with said straight line movable sensor 5 with said controller 9, said straight line movable sensor 3, said straight line movable sensor 4 respectively;
Said control module is according to the data from said straight line movable sensor 3, said straight line movable sensor 4 and said straight line movable sensor 5; Obtain the antenna 1-2 of current read write line 1 and the distance between the active electronic label 2, said control module is sent instruction to control moving of said slide block 7 according to this distance to said controller 9;
Distance when said control module is exchanged between " said read write line 1 can receive the answer signal from said active electronic label 2 " and " said read write line 1 can not receive the answer signal from said active electronic label 2 " according to the information that should carry from the signal of said read write line 1; And the calibration regression curve of storing in advance, obtain current grain moisture content content.
According to a kind of embodiment, said read write line 1 is a 433MHz band RFID read write line, and said active electronic label 2 is 433MHz band RFID active electronic labels.
According to a kind of embodiment, said control module comprises interconnective middleware 10 and host computer 11;
Said host computer 11 is connected with said controller 9;
Said middleware 10; Be connected with said straight line movable sensor 5 with said read write line 1, said straight line movable sensor 3, said straight line movable sensor 4 respectively; Be used to receive the data that said read write line 1, said straight line movable sensor 3, said straight line movable sensor 4 and said straight line movable sensor 5 are uploaded; And by after state the embodiment data processing method; Set up the correlationship that receives between data and path loss and specific inductive capacity, and the data after will handling are sent to said host computer 9;
The data distributing of said host computer 11 after according to this processing instructs in controller 9, the moving of control slide block 7, and reaching database after the related data;
In order to weaken the influence of pick-up unit to electromagnetic environment, mechanical hook-ups such as said vertical guide rail 6, said slide block 7, said horizontal brace rod 8 adopt low dielectric parameter class material to process, and said horizontal brace rod 8 length are at least 10cm..
The device of the online detection grain moisture content content based on radio frequency identification of the present invention is before test; Need be according to different grain kinds; Under different state, set up standard database; These data can pre-deposit in the system, also can be set according to standard is on-the-spot by the user.Middleware 10 processing collected data calculate the specific inductive capacity of grain layer to be measured, and with the database corresponding data relatively, find out the corresponding moisture numerical value of identical specific inductive capacity, and be shown in host computer 11.
Electromagnetic wave dielectric space decay (L
s) be:
Wherein, ε
rBe the medium relative dielectric constant, c is the light velocity (3 * 10
8Meter per second), d (m) is the vertical range of read write line 1 and active electronic label 2 in the medium, and f (MHz) is for being the wave frequency of unit with MHz.
For the electromagnetic wave of f=433MHz, its free space attenuation
is:
Wherein, d
1(m) be the vertical range between read write line 1 and the grain heap surface in the free space.
And for the electromagnetic wave of same frequency, the decay (L when the grain dielectric space
s) be:
Wherein, d
2(m) be the vertical range between free space China Oil and Food Import and Export Corporation heap surface and the active electronic label 2, ε
rBe the medium relative dielectric constant.
From on can find out that electromagnetic energy is greater than free space attenuation at the attenuation degree of dielectric space, and the size of attenuation degree depends on the relative dielectric constant of medium fully.To different grains dryness level in various degree, its overall dielectric constant has than big-difference.As, the specific inductive capacity of storage rice is generally between 3～8.
Generally speaking, for general 433MHz rfid system, the read write line emissive power is made as P
0=+10dBm, receiving sensitivity P '=-110dBm.
When placing grain, active electronic tag 2 piles surperficial d
2(m) degree of depth place supposes that electromagnetic energy that active electronic label 2 response returns is at d
1(m) locate to be P
r, then read write line is received response signal, need meet the following conditions:
P
r≥P′。
With ε
r=8 is example, if read write line 1 is apart from grain heap surface distance d
1(m)=and 2m, active electronic label 2 places grain to pile surperficial d
2(m) degree of depth then can be derived read write line 1 and can read the d under active electronic label 2 prerequisites
2(m) ultimate range.
Suppose that active electronic label 2 sends the transmitting-receiving loss Δ P=3dB of response signal process from the electromagnetic wave that receives read write line 1 emission to active electronic label 2, then at maximum readable range d
2(m) locate:
Can release d
2=0.45m.
And work as ε
r, can get d under the similarity condition at=3 o'clock
2=0.74m.
If under the equal situation, when active electronic tag puts 2 in certain storage rice surface d
2During=0.5m, read write line 1 does not receive active electronic label 2 response signals, then can derive the DIELECTRIC CONSTANTS of this storage rice thus
r=6.55, infer that then its moisture is about 8%.
In the practical application, the cereal crops of different regions have different measuring basis values, therefore before test; Need be according to different grain kinds; Under different state, set up standard database, these data can pre-deposit in the system, also can be set according to standard is on-the-spot by the user.
The invention provides a kind of method of the online detection grain moisture content content based on radio frequency identification, it may further comprise the steps based on above-mentioned device:
Step 1: read write line 1 sends signal to control module in real time, the information from the answer signal of said active electronic label 2 that this signal carries whether said read write line 1 can receive;
Step 2: said control module is sent instruction to control moving of said slide block 7 according to the data from the said first straight line movable sensor 3, the said second straight line movable sensor 4 and said the 3rd straight line movable sensor 5 to said controller 9;
Step 3: when this information of carrying from the signal of said read write line 1 is exchanged, turn to step 4 between " said read write line 1 can receive the answer signal from said active electronic label 2 " and " said read write line 1 can not receive the answer signal from said active electronic label 2 ";
Step 4: said control module is according to current data from the said first straight line movable sensor 3, the said second straight line movable sensor 4 and said the 3rd straight line movable sensor 5; Measure the antenna of read write line 1 and the distance between the active electronic label 2; Said control module according to this distance and in advance the storage the calibration regression curve, obtain current grain moisture content content.
According to a kind of embodiment, step 4 may further comprise the steps:
Step 41; Control module is according to current data from the said first straight line movable sensor 3, the said second straight line movable sensor 4 and said the 3rd straight line movable sensor 5; Measure the antenna 1-2 of read write line 1 and the distance between the active electronic label 2, calculate the DIELECTRIC CONSTANTS of current grain layer
r
Step 42, control module is according to current grain layer DIELECTRIC CONSTANTS
r, and the calibration regression curve of storage in advance, obtain the moisture of current grain layer.
According to a kind of embodiment, said read write line 1 is a 433MHz band RFID read write line, and said active electronic label 2 is 433MHz band RFID active electronic labels.
The present invention also provides a kind of method based on the online detection grain moisture content of radio frequency identification system content, may further comprise the steps:
Step S1: the position of horizontal fixed read write line 1, linear displacement transducer 3 place vertical guide rail 6 one ends, and the antenna 1-2 level on maintenance and the read write line 1;
Step S2: horizontal fixed linear displacement transducer 4 is in air interface and grain horizontal interface position, and the spacing of linear displacement transducer 3 and linear displacement transducer 4 is designated as d
1(m);
Step S3: be fixed in linear displacement transducer 5 on the slide block 7; Slide block 7 joins with horizontal brace rod 8 one ends; The other end of horizontal brace rod 8 and active electronic label 2 join; Linear displacement transducer 5 is in same surface level with active electronic label 2, and linear displacement transducer 5, slide block 7, horizontal brace rod 8 and active electronic label 2 can be along vertical guide rail 6 same moved further, and the distance between linear displacement transducer 4 and the linear displacement transducer 5 is designated as d
2(m);
Step S4: system initialization, d
2(m) zero clearing;
Step S5: start read write line 1;
Step S6: judge whether active electronic label 2 is readable, if the readable step S7 that then changes, if the not readable step S8 that then changes;
Step S7: host computer 11 control controllers 9 drive active electronic label 2 with driving sliding block 7 and linear displacement transducer 5 moves down a step along vertical guide rail 6 synchronously, write down current d
2(m) value, and change step S6;
Step S8: keep current d
2(m) value is judged whether fault of system, if the system failure is then changeed step S9, if not fault is then changeed step S10;
Step S9: system alarm;
Step S10: by current d
2(m) value is confirmed grain DIELECTRIC CONSTANTS to be measured
r, and by the host computer demonstration DIELECTRIC CONSTANTS of surveying
rAnd grain moisture content content.
In addition, the method for the online detection grain moisture content content based on radio frequency identification of the present invention also can be used for detecting the moisture of other media, for example soil, tobacco etc.
The above embodiment; The present invention embodiment a kind of more preferably just; Common variation and replacement that those skilled in the art carries out in technical scheme scope of the present invention; On the basis of technical scheme of the present invention, allly all should be included in the protection domain of technical scheme of the present invention change and the equivalents that particular carries out according to the principle of the invention.
Claims (6)
1. device based on the online detection grain moisture content content of radio frequency identification; It is characterized in that; Comprise: read write line, active electronic label, the first straight line movable sensor, the second straight line movable sensor, the 3rd straight line movable sensor, vertical guide rail, slide block, horizontal brace rod, controller, housing and control module, wherein:
Said read write line is equipped with antenna on it, be electrically connected with said control module;
Said read write line sends signal to said control module in real time, and whether this signal carries said read write line can receive the information from the answer signal of said active electronic label;
Said active electronic label passes through the horizontal brace rod physical connection with said vertical guide rail;
The line of the phase center of said antenna and the phase center of said active electronic label is with the last perpendicular of grain heap;
The said first straight line movable sensor, the said second said straight line movable sensor are individually fixed on the said vertical guide rail, wherein,
The height of the phase center of the antenna of the said height of the first straight line movable sensor on said vertical guide rail and said read write line is identical;
The height of the said second straight line movable sensor on said vertical guide rail is identical with the height of grain horizontal surface;
Distance between said first straight line movable sensor and the said second straight line movable sensor is used to identify the antenna of said read write line and the relative position between the grain horizontal surface;
Said slide block is embedded in the said vertical guide rail, and is connected with said controller, and said slide block can be free to slide along said vertical track below said straight line movable sensor according to the instruction of said controller;
Said the 3rd straight line movable sensor is bound to said slide block, and said the 3rd straight line movable sensor and said slide block are synchronous;
Said slide block drives said active electronic label through said horizontal brace rod and moves up and down synchronously, said active electronic label of spacing characterizing between said the 3rd straight line movable sensor and the said second straight line movable sensor and the spacing between the grain horizontal surface;
Said housing is used to store grain heap to be measured, and said active electronic label places under the upper surface of said enclosure interior grain heap; Said read write line, said vertical guide rail, the said first straight line movable sensor, the said second straight line movable sensor, said the 3rd straight line movable sensor, said slide block, said controller and said control module all are positioned at outside; Said horizontal brace rod penetrates said housing, makes the active electronic label of said enclosure interior and the slide block of said outside link;
Said control module is connected with said controller, the said first straight line movable sensor, the said second straight line movable sensor and said the 3rd straight line movable sensor respectively;
Said control module is according to the data from the said first straight line movable sensor, the said second straight line movable sensor and said the 3rd straight line movable sensor; Obtain the antenna of current read write line and the distance between the active electronic label, said control module is sent instruction to control moving of said slide block according to this distance to said controller;
The antenna of the read write line when said control module is exchanged between " said read write line can receive the answer signal from said active electronic label " and " said read write line can not receive the answer signal from said active electronic label " according to the information that should carry from the signal of said read write line and the distance between the active electronic label; And the calibration regression curve of storing in advance, obtain current grain moisture content content.
2. the device of the online detection grain moisture content content based on radio frequency identification as claimed in claim 1 is characterized in that said control module comprises interconnective middleware and host computer;
Said host computer is connected with said controller;
Said middleware; Be connected with said read write line, the said first straight line movable sensor, said the 3rd straight line movable sensor of the said second straight line movable sensor respectively; Be used to receive and handle the data that said read write line, the said first straight line movable sensor, the said second straight line movable sensor and said the 3rd straight line movable sensor are uploaded, and the data after will handling are sent to said host computer.
3. the device of the online detection grain moisture content content based on radio frequency identification as claimed in claim 2 is characterized in that said read write line is a 433MHz band RFID read write line, and said active electronic label is a 433MHz band RFID active electronic label.
4. method based on the online detection grain moisture content content of radio frequency identification, it is characterized in that based on device as claimed in claim 1, may further comprise the steps:
Step 1: read write line sends signal to control module in real time, the information from the answer signal of said active electronic label that this signal carries whether said read write line can receive;
Step 2: said control module is sent instruction to control moving of said slide block according to the data from the said first straight line movable sensor, the said second straight line movable sensor and said the 3rd straight line movable sensor to said controller;
Step 3: when this information of carrying from the signal of said read write line is exchanged, turn to step 4 between " said read write line can receive the answer signal from said active electronic label " and " said read write line can not receive the answer signal from said active electronic label ";
Step 4: said control module is according to current data from the said first straight line movable sensor, the said second straight line movable sensor and said the 3rd straight line movable sensor; Measure the antenna of read write line and the distance between the active electronic label; Said control module according to this distance and in advance the storage the calibration regression curve, obtain current grain moisture content content.
5. the method for the detection grain moisture content content based on radio RF recognition technology according to claim 4 is characterized in that step 4 may further comprise the steps:
Step 41; Control module is according to current data from the said first straight line movable sensor, the said second straight line movable sensor and said the 3rd straight line movable sensor; Measure the antenna of read write line and the distance between the active electronic label, calculate the DIELECTRIC CONSTANTS of current grain layer
r
Step 42, control module is according to current grain layer DIELECTRIC CONSTANTS
r, and the calibration regression curve of storage in advance, obtain the moisture of current grain layer.
6. the method for the detection grain moisture content content based on radio RF recognition technology as claimed in claim 5 is characterized in that said read write line is a 433MHz band RFID read write line, and said active electronic label is a 433MHz band RFID active electronic label.
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| CN113390470A (en) * | 2021-08-17 | 2021-09-14 | 南京艾龙信息科技有限公司 | Grain condition detection system for grain storage supervision |
| CN114444635A (en) * | 2022-02-08 | 2022-05-06 | 河南工业大学 | Grain water content and temperature prediction method and system based on RFID (radio frequency identification) tag |
| CN114444635B (en) * | 2022-02-08 | 2023-10-17 | 河南工业大学 | Method and system for predicting grain water content and temperature based on RFID (radio frequency identification) tag |
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