CN102759546B - 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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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 of the online detection accumulating Measurement for Grain Moisture Content based on radio frequency identification (RFID) technology.
Background technology
Moisture is the key index of grain quality, directly affects the process such as purchase, transportation, storage, processing, trade of grain.Moisture in grain can be divided in conjunction with water (water of crystallization) and free water (free water) by physical property.In conjunction with water self-assembling formation in grain grain growth course, be present in the grain cell, with grain intragranular hydrophilic substance, to be combined very firmly, character is very stable, in conjunction with water, does not participate in conduction; Free water is to condense upon in the kapillary of grain inside and the moisture in molecular gap by physisorption, and it has the conduction property of light water, and the moisture detected at ordinary times refers to free water.If buy and grain reservation indiscriminately, will inevitably affect the storage cycle of grain, cause the mouldy, rotten, rotten too early of grain, therefore must constantly take notice of the moisture of grain.
When grain purchases stand in purchase grain, first will detect the humidity of grain, traditional detection method is to adopt sample to dry weight method.At present at home during grain purchases, with hand, touch that tooth is stung or traditional detection method judges the moisture of grain, have that measurement result is extremely unreliable, detection time the 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 Measurement for Grain Moisture Content based on radio frequency identification, utilization is embedded in the active electronic label under grain heap to be measured surface, response condition by the observation active electronic label, and, by corresponding calculating, indirectly reflect the pile water content of putting out cereal.
In order to achieve the above object, the invention provides a kind of device of the online detection Measurement for Grain Moisture Content based on radio frequency identification, comprise: read write line, active electronic label, the first traveling priority sensor, the second traveling priority sensor, the 3rd traveling priority sensor, vertical guide rail, slide block, horizontal brace rod, controller, housing and control module, wherein:
Described read write line, be equipped with antenna on it, with described control module electrical connection;
Described read write line is in real time to described control module transmitted signal, and whether this signal carries described read write line can receive the information from the answer signal of described active electronic label;
Described active electronic label, pass through the horizontal brace rod physical connection with described vertical guide rail;
The line of the phase center of described antenna and the phase center of described active electronic label, with the upper perpendicular of grain heap;
Described the first traveling priority sensor, described the second traveling priority sensor are individually fixed on described vertical guide rail, wherein,
The height of the phase center of the antenna of the described height of the first traveling priority sensor on described vertical guide rail and described read write line is identical;
The height of described the second traveling priority sensor on described vertical guide rail is identical with the height of the upper horizontal surface of grain heap;
Relative position between the upper horizontal surface that distance between described the first traveling priority sensor and described the second traveling priority sensor is piled for the antenna that identifies described read write line and grain;
Described slide block, be embedded in described vertical guide rail, and be connected with described controller, and described slide block can be free to slide along described vertical guide rail according to the instruction of described controller below described the second traveling priority sensor;
Described the 3rd traveling priority sensor is bound to described slide block, and described the 3rd traveling priority sensor is synchronizeed with described slide block;
Described slide block drives described active electronic label by described horizontal brace rod and synchronously moves up and down, the spacing between the upper horizontal surface of the described active electronic label of spacing characterizing between described the 3rd traveling priority sensor and described the second traveling priority sensor and grain heap;
Described housing is for storing grain heap to be measured, and described active electronic label is placed under the upper horizontal surface of described enclosure interior grain heap; Described read write line, described vertical guide rail, described the first traveling priority sensor, described the second traveling priority sensor, described the 3rd traveling priority sensor, described slide block, described controller and described control module, all be positioned at outside; Described horizontal brace rod penetrates described housing, makes the active electronic label of described enclosure interior and the slide block interlock of described outside;
Described control module, be connected with described controller, described the first traveling priority sensor, described the second traveling priority sensor and described the 3rd traveling priority sensor respectively;
Described control module is according to the data from described the first traveling priority sensor, described the second traveling priority sensor and described the 3rd traveling priority sensor, obtain the antenna of current read write line and the distance between active electronic label, and send instruction to control the movement of described slide block according to this distance to described controller;
Described control module according to the information that should carry from the signal of described read write line from the antenna of read write line during exchange and the distance between active electronic label between " described read write line can receive the answer signal from described active electronic label " and " described read write line can not receive the answer signal from described active electronic label ", and pre-stored calibration regression curve, obtain current Measurement for Grain Moisture Content.
During enforcement, described control module comprises interconnective middleware and host computer;
Described host computer is connected with described controller;
Described middleware, with described read write line, described the first traveling priority sensor, described the 3rd traveling priority sensor of described the second traveling priority sensor, be connected respectively, for receiving and process the data that described read write line, described the first traveling priority sensor, described the second traveling priority sensor and described the 3rd traveling priority sensor are uploaded, and the data after processing are sent to described host computer.
During enforcement, described read write line is 433MHz band RFID read write line, and described active electronic label is 433MHz band RFID active electronic label.
The present invention also provides a kind of method of the online detection Measurement for Grain Moisture Content based on radio frequency identification, and its device based on above-mentioned comprises the following steps:
Step 1: read write line is in real time to the control module transmitted signal, and whether this signal carries described read write line can receive the information from the answer signal of described active electronic label;
Step 2: described control module, according to the data from described the first traveling priority sensor, described the second traveling priority sensor and described the 3rd traveling priority sensor, sends instruction to control the movement of described slide block to described controller;
Step 3: when this information of carrying from the signal of described read write line, when exchanging between " described read write line can receive the answer signal from described active electronic label " and " described read write line can not receive the answer signal from described active electronic label ", turn to step 4;
Step 4: described control module is according to the current data from described the first traveling priority sensor, described the second traveling priority sensor and described the 3rd traveling priority sensor, measure the antenna of read write line and the distance between active electronic label, described control module, according to this distance and pre-stored calibration regression curve, obtains current Measurement for Grain Moisture Content.
During enforcement, step 4 comprises the following steps:
Step 41, control module is according to the current data from described the first traveling priority sensor, described the second traveling priority sensor and described the 3rd traveling priority sensor, measure the antenna of read write line and the distance between active electronic label, calculate the DIELECTRIC CONSTANT ε of current grain layer
r;
Step 42, control module is according to current grain layer DIELECTRIC CONSTANT ε
r, and pre-stored calibration regression curve, obtain the moisture of current grain layer.
During enforcement, described read write line is 433MHz band RFID read write line, and described active electronic label is 433MHz band RFID active electronic label.
Compared with prior art, the apparatus and method of the online detection Measurement for Grain Moisture Content based on radio frequency identification of the present invention, can be when guaranteeing certain measuring accuracy, easy and simple to handle, and can provide online test result, has certain economic benefit.
The accompanying drawing explanation
Fig. 1 is the structural drawing of a specific embodiment of the device of the online detection Measurement for Grain Moisture 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 Measurement for Grain Moisture Content based on radio frequency identification of the present invention.
Embodiment
In recent years, due to the development of sensor technology, computer technology, very large scale integration technology and the network communications technology, make grain feelings detection technique, at aspects such as hardware and software, certain development arranged.For the online grain moisture content that accurately detects, the present invention provides a kind of apparatus and method of the online detection Measurement for Grain Moisture Content based on radio frequency identification, when guaranteeing measuring accuracy, easy and simple to handle, can provide in real time testing result.Particularly the current wireless REID is in the extensive application of grain depot accumulating link, and the universal RFID system detects Measurement for Grain Moisture Content, can additionally not increase the large number quipments cost.At present, rfid system commonly used is operated in ISM(Industrial, Scientific and Medical mostly in the world), the 433MHz frequency range often is used to short haul connection device and radio amateur's frequency range, need not apply for specially, this device and method versatility is stronger, effectively shorten the design cycle, there is stronger actual operation.
The invention provides a kind of device and method of the online detection Measurement for Grain Moisture Content based on radio frequency identification.
Moisture in grain is larger, and the specific inductive capacity of grain is just larger, and in like manner, the specific inductive capacity of grain is larger, and corresponding moisture is higher.The present invention is by measuring the specific inductive capacity of grain, indirectly provide contained humidity in grain the number, i.e. moisture.
As shown in Figure 1, the device of the online detection Measurement for Grain Moisture Content based on radio frequency identification of the present invention comprises: read write line 1, active electronic label 2, traveling priority sensor 3, traveling priority sensor 4, traveling priority sensor 5, vertical guide rail 6, slide block 7, horizontal brace rod 8, controller 9, housing 12 and control module, wherein:
Described read write line 1, be equipped with antenna 1-2 on it, with described control module electrical connection;
Described read write line 1 is in real time to described control module transmitted signal, and whether this signal carries described read write line 1 can receive the information from the answer signal of described active electronic label 2;
Described active electronic label 2, pass through horizontal brace rod 8 physical connections with described vertical guide rail 6;
The line of the phase center of the phase center of described antenna 1-2 and described active electronic label 2, with the upper perpendicular of grain heap;
Described traveling priority sensor 3, described traveling priority sensor 4 are individually fixed in the relevant position on described vertical guide rail 6, wherein,
The height of the phase center of the antenna 1-2 of the height of described traveling priority sensor 3 on described vertical guide rail 6 and described read write line 1 is identical;
The height of described traveling priority sensor 4 on described vertical guide rail 6 is identical with the height of the upper horizontal surface of grain heap;
Relative position d1 between the upper horizontal surface that distance between described traveling priority sensor 3 and described traveling priority sensor 4 is piled for the antenna 1-2 that identifies described read write line 1 and grain;
Described slide block 7, be embedded in described vertical guide rail 6, and be connected with described controller 9, and described slide block 7 can be free to slide along described vertical track 6 according to the instruction of described controller 9 below described traveling priority sensor 4;
Described traveling priority sensor 5 is bound to described slide block 7, and described traveling priority sensor 5 is synchronizeed with described slide block 7;
Described slide block 7 drives described active electronic label 2 by described horizontal brace rod 8 and synchronously moves up and down, the spacing d2 between the upper horizontal surface of the described active electronic label 2 of spacing characterizing between described traveling priority sensor 5 and described traveling priority sensor 4 and grain heap;
Described housing 12 is for storing grain heap to be measured, wherein active electronic label 2 is placed under the upper horizontal surface of the inner grain heap of described housing 12, for the ease of operation, described read write line 1, described antenna 1-2, described vertical guide rail 6, described traveling priority sensor 3, described traveling priority sensor 4, described traveling priority sensor 5, described slide block 7, described controller 9 and described control module, all be positioned at housing 12 outsides.Horizontal brace rod 8 penetrates housing 12, makes the active electronic label 2 of housing 12 inside and slide block 7 interlocks of housing 12 outsides.
Described control module, be connected with described controller 9, described traveling priority sensor 3, described traveling priority sensor 4 and described traveling priority sensor 5 respectively;
Described control module is according to the data from described traveling priority sensor 3, described traveling priority sensor 4 and described traveling priority sensor 5, obtain the antenna 1-2 of current read write line 1 and the distance between active electronic label 2, described control module sends instruction to control the movement of described slide block 7 according to this distance to described controller 9;
Described control module according to the information that should carry from the signal of described read write line 1 from distance during exchange between " described read write line 1 can receive the answer signal from described active electronic label 2 " and " described read write line 1 can not receive the answer signal from described active electronic label 2 ", and pre-stored calibration regression curve, obtain current Measurement for Grain Moisture Content.
According to a kind of embodiment, described read write line 1 is 433MHz band RFID read write line, and described active electronic label 2 is 433MHz band RFID active electronic labels.
According to a kind of embodiment, described control module comprises interconnective middleware 10 and host computer 11;
Described host computer 11 is connected with described controller 9;
Described middleware 10, with described read write line 1, described traveling priority sensor 3, described traveling priority sensor 4 and described traveling priority sensor 5, be connected respectively, for receiving the data that described read write line 1, described traveling priority sensor 3, described traveling priority sensor 4 and described traveling priority sensor 5 are uploaded, and by aftermentioned embodiment data processing method, set up the correlationship received between data and path loss and specific inductive capacity, and the data after processing are sent to described host computer 9;
Data distributing instruction after described host computer 11 is processed according to this, in controller 9, is controlled the movement of slide block 7, and reaching database after related data;
Described host computer 11, be used for basis from the signal of described read write line 1 and from described traveling priority sensor 3, the data of described traveling priority sensor 4 and described traveling priority sensor 5, obtain the antenna 1-2 of current read write line 1 and the distance between active electronic label 2, described host computer 11 sends control signal according to this distance to described controller 9, described controller 9 is controlled described slide block 7 according to this control signal and is moved, and described host computer 11 according to the information that should carry from the signal of read write line 1 from distance during exchange between " described read write line 1 can receive the answer signal from described active electronic label 2 " and " described read write line 1 can not receive the answer signal from described active electronic label 2 ", and pre-stored calibration regression curve, obtain current Measurement for Grain Moisture Content.
In order to weaken the mechanical hook-ups such as the impact of pick-up unit on electromagnetic environment, described vertical guide rail 6, described slide block 7, described horizontal brace rod 8, adopt low dielectric parameter class material to make, described horizontal brace rod 8 length are at least 10cm..
The device of the online detection Measurement for Grain Moisture Content based on radio frequency identification of the present invention is before test, need to be according to different grain kinds, set up the database of standard under different states, these data can pre-deposit in system, also can according to standard is on-the-spot, be set by the user.Middleware 10 is processed image data, calculates the specific inductive capacity of grain layer to be measured, and compares with the database corresponding data, finds out the moisture numerical value that identical specific inductive capacity is corresponding, and is shown in host computer 11.
Electromagnetic wave dielectric space decay (L
s) be:
Wherein, ε
rfor the medium relative dielectric constant, c is the light velocity (3 * 10
8meter per second), the vertical range that d (m) is read write line 1 and active electronic label 2 in medium, f (MHz) is for take the wave frequency that MHz is unit.
For the electromagnetic wave of f=433MHz, its free space attenuation
for:
Wherein, d
1(m) be the vertical range between read write line 1 and grain heap surface in free space.
And for the electromagnetic wave of same frequency, the decay when the grain dielectric space (L '
s) be:
Wherein, d
2(m) be the vertical range between free space China Oil and Food Import and Export Corporation heap surface and active electronic label 2, ε
rfor the medium relative dielectric constant.
As can be seen from above, 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.The dryness level in various degree for different grain, its overall dielectric constant has larger 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 being placed in grain, active electronic label 2 piles surperficial d
2(m) depth, suppose that electromagnetic energy that active electronic label 2 response returns is at d
1(m) locate as P
r, 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)=2m, active electronic label 2 is placed in grain and piles surperficial d
2(m) degree of depth, can derive 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, at maximum readable range d
2(m) locate:
Can release d
2=0.45m.
And work as ε
r, under similarity condition, can obtain d at=3 o'clock
2=0.74m.
If under equal situation, when active electronic label puts 2 in certain storage rice surface d
2during=0.5m, read write line 1 does not receive active electronic label 2 response signals, can derive thus the DIELECTRIC CONSTANT ε of this storage rice
r=6.55, then infer that its moisture is about 8%.
In practical application, the cereal crops of different regions have different measuring basis values, therefore before test, need to be according to different grain kinds, set up the database of standard under different states, these data can pre-deposit in system, also can according to standard is on-the-spot, be set by the user.
The invention provides a kind of method of the online detection Measurement for Grain Moisture Content based on radio frequency identification, its device based on above-mentioned comprises the following steps:
Step 1: read write line 1 is in real time to the control module transmitted signal, and whether this signal carries described read write line 1 can receive the information from the answer signal of described active electronic label 2;
Step 2: described control module, according to the data from described the first traveling priority sensor 3, described the second traveling priority sensor 4 and described the 3rd traveling priority sensor 5, sends instruction to control the movement of described slide block 7 to described controller 9;
Step 3: when this information of carrying from the signal of described read write line 1, when exchanging between " described read write line 1 can receive the answer signal from described active electronic label 2 " and " described read write line 1 can not receive the answer signal from described active electronic label 2 ", turn to step 4;
Step 4: described control module is according to the current data from described the first traveling priority sensor 3, described the second traveling priority sensor 4 and described the 3rd traveling priority sensor 5, measure the antenna of read write line 1 and the distance between active electronic label 2, described control module, according to this distance and pre-stored calibration regression curve, obtains current Measurement for Grain Moisture Content.
According to a kind of embodiment, step 4 comprises the following steps:
Step 41, control module is according to the current data from described the first traveling priority sensor 3, described the second traveling priority sensor 4 and described the 3rd traveling priority sensor 5, measure the antenna 1-2 of read write line 1 and the distance between active electronic label 2, calculate the DIELECTRIC CONSTANT ε of current grain layer
r;
Step 42, control module is according to current grain layer DIELECTRIC CONSTANT ε
r, and pre-stored calibration regression curve, obtain the moisture of current grain layer.
According to a kind of embodiment, described read write line 1 is 433MHz band RFID read write line, and described active electronic label 2 is 433MHz band RFID active electronic labels.
The present invention also provides a kind of method that detects online Measurement for Grain Moisture Content based on radio frequency identification system, comprises the following steps:
Step S1: level is the position of read write line 1 fixedly, and linear displacement transducer 3 is placed in vertical guide rail 6 one ends, and the antenna 1-2 level on maintenance and read write line 1;
Step S2: fixedly linear displacement transducer 4 is in Air Interface and grain horizontal interface position for level, and the spacing of linear displacement transducer 3 and linear displacement transducer 4 is designated as d
1(m);
Step S3: linear displacement transducer 5 is fixed on 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 and active electronic label 2 are in same level, linear displacement transducer 5, slide block 7, horizontal brace rod 8 and active electronic label 2 can be along vertical guide rail 6 synchronizing movings, and the distance between linear displacement transducer 4 and 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 that whether active electronic label 2 is readable, if readable, go to step S7, go to step S8 if not readable;
Step S7: host computer 11 is controlled controller 9 to drive slide block 7 drive active electronic labels 2 and linear displacement transducer 5 synchronously along vertical guide rail 6, to move down a step, records current d
2(m) value, and go to step S6;
Step S8: retain current d
2(m) value, judge whether fault of system, if the system failure goes to step S9, if not fault goes to step S10;
Step S9: system alarm;
Step S10: by current d
2(m) value is determined grain DIELECTRIC CONSTANT ε to be measured
r, and show by host computer the DIELECTRIC CONSTANT ε of surveying
rand Measurement for Grain Moisture Content.
In addition, the method for the online detection Measurement for Grain Moisture Content based on radio frequency identification of the present invention also can be for detection of the moisture in other media, such as 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 the technical solution of the present invention scope; on the basis of technical solution of the present invention, all changes of particular being carried out according to the principle of the invention and equivalents all should be included in the protection domain of technical solution of the present invention.
Claims (6)
1. the device of the online detection Measurement for Grain Moisture Content based on radio frequency identification, it is characterized in that, comprise: read write line, active electronic label, the first traveling priority sensor, the second traveling priority sensor, the 3rd traveling priority sensor, vertical guide rail, slide block, horizontal brace rod, controller, housing and control module, wherein:
Described read write line, be equipped with antenna on it, with described control module electrical connection;
Described read write line is in real time to described control module transmitted signal, and whether this signal carries described read write line can receive the information from the answer signal of described active electronic label;
Described active electronic label, pass through the horizontal brace rod physical connection with described vertical guide rail;
The line of the phase center of described antenna and the phase center of described active electronic label, with the upper perpendicular of grain heap;
Described the first traveling priority sensor, described the second traveling priority sensor are individually fixed on described vertical guide rail, wherein,
The height of the phase center of the antenna of the described height of the first traveling priority sensor on described vertical guide rail and described read write line is identical;
The height of described the second traveling priority sensor on described vertical guide rail is identical with the height of the upper horizontal surface of grain heap;
Relative position between the upper horizontal surface that distance between described the first traveling priority sensor and described the second traveling priority sensor is piled for the antenna that identifies described read write line and grain;
Described slide block, be embedded in described vertical guide rail, and be connected with described controller, and described slide block can be free to slide along described vertical guide rail according to the instruction of described controller below described the second traveling priority sensor;
Described the 3rd traveling priority sensor is bound to described slide block, and described the 3rd traveling priority sensor is synchronizeed with described slide block;
Described slide block drives described active electronic label by described horizontal brace rod and synchronously moves up and down, the spacing between the upper horizontal surface of the described active electronic label of spacing characterizing between described the 3rd traveling priority sensor and described the second traveling priority sensor and grain heap;
Described housing is for storing grain heap to be measured, and described active electronic label is placed under the upper horizontal surface of described enclosure interior grain heap; Described read write line, described vertical guide rail, described the first traveling priority sensor, described the second traveling priority sensor, described the 3rd traveling priority sensor, described slide block, described controller and described control module, all be positioned at outside; Described horizontal brace rod penetrates described housing, makes the active electronic label of described enclosure interior and the slide block interlock of described outside;
Described control module, be connected with described controller, described the first traveling priority sensor, described the second traveling priority sensor and described the 3rd traveling priority sensor respectively;
Described control module is according to the data from described the first traveling priority sensor, described the second traveling priority sensor and described the 3rd traveling priority sensor, obtain the antenna of current read write line and the distance between active electronic label, described control module sends instruction to control the movement of described slide block according to this distance to described controller;
Described control module according to the information that should carry from the signal of described read write line from the antenna of read write line during exchange and the distance between active electronic label between " described read write line can receive the answer signal from described active electronic label " and " described read write line can not receive the answer signal from described active electronic label ", and pre-stored calibration regression curve, obtain current Measurement for Grain Moisture Content.
2. the device of the online detection Measurement for Grain Moisture Content based on radio frequency identification as claimed in claim 1, is characterized in that, described control module comprises interconnective middleware and host computer;
Described host computer is connected with described controller;
Described middleware, with described read write line, described the first traveling priority sensor, described the second traveling priority sensor, described the 3rd traveling priority sensor, be connected respectively, for receiving and process the data that described read write line, described the first traveling priority sensor, described the second traveling priority sensor and described the 3rd traveling priority sensor are uploaded, and the data after processing are sent to described host computer.
3. the device of the online detection Measurement for Grain Moisture Content based on radio frequency identification as claimed in claim 2, is characterized in that, described read write line is 433MHz band RFID read write line, and described active electronic label is 433MHz band RFID active electronic label.
4. the method for the online detection Measurement for Grain Moisture Content based on radio frequency identification, it based on device as claimed in claim 1, is characterized in that, comprises the following steps:
Step 1: read write line is in real time to the control module transmitted signal, and whether this signal carries described read write line can receive the information from the answer signal of described active electronic label;
Step 2: described control module, according to the data from described the first traveling priority sensor, described the second traveling priority sensor and described the 3rd traveling priority sensor, sends instruction to control the movement of described slide block to described controller;
Step 3: when this information of carrying from the signal of described read write line, when exchanging between " described read write line can receive the answer signal from described active electronic label " and " described read write line can not receive the answer signal from described active electronic label ", turn to step 4;
Step 4: described control module is according to the current data from described the first traveling priority sensor, described the second traveling priority sensor and described the 3rd traveling priority sensor, measure the antenna of read write line and the distance between active electronic label, described control module, according to this distance and pre-stored calibration regression curve, obtains current Measurement for Grain Moisture Content.
5. the method for the online detection Measurement for Grain Moisture Content based on radio frequency identification according to claim 4, is characterized in that, step 4 comprises the following steps:
Step 41, control module is according to the current data from described the first traveling priority sensor, described the second traveling priority sensor and described the 3rd traveling priority sensor, measure the antenna of read write line and the distance between active electronic label, calculate the DIELECTRIC CONSTANT ε of current grain layer
r;
Step 42, control module is according to current grain layer DIELECTRIC CONSTANT ε
r, and pre-stored calibration regression curve, obtain the moisture of current grain layer.
6. the method for the online detection Measurement for Grain Moisture Content based on radio frequency identification as claimed in claim 5, is characterized in that, described read write line is 433MHz band RFID read write line, and described active electronic label is 433MHz band RFID active electronic label.
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| JP5942912B2 (en) * | 2013-03-27 | 2016-06-29 | 株式会社デンソーウェーブ | Water content estimation system, wireless tag reader |
| CN104777268A (en) * | 2014-01-13 | 2015-07-15 | 苏州朗博校准检测有限公司 | Chemical method trace moisture meter calibration detection method |
| CN103885486A (en) * | 2014-03-09 | 2014-06-25 | 苏州边枫电子科技有限公司 | Barn temperature control system based on guided temperature measurement ball temperature sensing detection |
| CN104155315B (en) * | 2014-08-19 | 2016-09-07 | 江苏麦赫物联网科技有限公司 | The detection device and method of on-line measurement grain moisture content based on radio frequency transmission |
| CN104597089B (en) * | 2015-01-17 | 2017-04-19 | 辽东学院 | Wireless sensor |
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