CN103175852A - Apparatus for online detection of content of water in stored grains, and method thereof - Google Patents
Apparatus for online detection of content of water in stored grains, and method thereof Download PDFInfo
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- CN103175852A CN103175852A CN2011104288014A CN201110428801A CN103175852A CN 103175852 A CN103175852 A CN 103175852A CN 2011104288014 A CN2011104288014 A CN 2011104288014A CN 201110428801 A CN201110428801 A CN 201110428801A CN 103175852 A CN103175852 A CN 103175852A
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Abstract
The invention discloses an apparatus for the online detection of the content of water in stored grains based on a ground penetrating radar technology, and a method thereof. The apparatus comprises a radar module, a drive module and a monitoring end. The drive module receives a control signal from the monitoring end and drives the radar module according to the control signal to make the radar module move in a plane of a detection zone; when the radar module is in the detection zone, the radar module sends a pulse signal to the detection zone; the radar module receives a target echo reflected from the detection zone, calculates according to a processed target echo to obtain a corresponding dielectric constant, and transmits the dielectric constant to the monitoring end; and the monitoring end corresponds the relationship between the received dielectric constant and a water content to generate a detection report. The apparatus and the method improve the technical effect of the management efficiency of the storage and transportation environment of the grains.
Description
Technical field
The present invention relates to stored grain water content detection field, be specifically related to a kind of stored grain moisture on-line measuring device and method thereof based on ground penetrating radar exploration.
Background technology
The stored grain moisture is the key index of grain security, directly affects the process such as storage, processing, trade of grain.If the associated temperature of untimely understanding grain reservation, moisture information will inevitably affect storage cycle of grain, cause grain too early mouldy, rotten, rot, therefore must constantly take notice of the moisture of grain.The different batches grain quality of putting in storage difference to some extent particularly, the grain of warehouse-in is piled up in grain bin bottom in advance, and after storage a period of time, temperature, humidity etc. have larger variation, and particularly the grain feelings for this part grain detect particularly important.
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.It is the focus of recent research that microwave mode detects the silo moisture, but the method also only limits to one-point measurement, and measurement result also only can reflected microwave institute through the mean value of grain inner track, be difficult to directly reflect that grain piles the actual grain feelings of inner each point.At present, in the industry one in short supply can understand fast and automatically the three-dimensional technological means that distributes of silo internal moisture content.
Ground penetrating radar (GPR, Ground Penetrating Radar) is proposition problem early.Yet just in the modern age of high frequency microelectric technique and the rapid exploitation of And Methods of Computer Date Processing, this technology just obtains the progress of internal.Today, ground penetrating radar not only on detection equipment high concentration the modern technologies fields achievement and be greatly improved, its application also rapidly the developing.Also there are many departments in China at present, comprises that the units such as ore deposit, ground, water power, coal, railway are carrying out the test and application of this technology.
Similar with sounding or communication Radar Technology, ground penetrating radar is also to utilize high-frequency electromagnetic pulse wave reflection to survey the purpose body, because Media Ratio air under epidermis has much better than attenuation Characteristic of Guided EM, the diversity of underground medium situation in addition, the ripple propagation characteristic in medium is than more complex in air.Along with the raising greatly of instrument signal to noise ratio and the application of data processing technique, the practical ranges of ground penetrating radar enlarges rapidly.
Along with developing rapidly of microelectric technique, present ground penetrating radar equipment is on-the-spot applicable light instrument by huge, heavy architecture advances already.Ground penetrating radar is owing to having adopted wideband short pulse and high sampling rate, make the resolution of its detection higher than all other geophysical exploration means, but again due to signal recovery technology such as the program of employing high order stack (nearly 4000 times) and many waveform processing, thereby signal to noise ratio (S/N ratio) and image display performance have greatly been improved.Stored grain moisture on-line measuring device and method thereof based on ground penetrating radar exploration, grain for moisture skewness in the storehouse is automatic, scanning comprehensively, extract the relevant pulse signal that returns, depict the 3 D stereo distribution plan of silo internal moisture content, offer grain depot related management personnel reference information directly perceived, be conducive to grasp storage grain feelings, be convenient to food administration.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of stored grain moisture on-line measuring device and method thereof based on ground penetrating radar exploration, to solve the current problem that can't directly reflect the actual grain feelings of the inner each point of silo.
In order to address the above problem, the invention provides a kind of stored grain moisture on-line measuring device based on ground penetrating radar exploration, comprising:
Radar module sends a pulse signal when the surveyed area in order to the position, and a target echo that receives reflection from this surveyed area, and calculates corresponding specific inductive capacity to transmit according to this target echo after processing;
Driver module is in order to drive this radar module at the planar movement of this surveyed area according to a control signal; And
Monitoring client controls signal to driver module in order to transmit this, and receives the specific inductive capacity from this radar module, and carries out corresponding to produce an examining report according to described specific inductive capacity and a moisture corresponding relation.
About the stored grain moisture online test method based on ground penetrating radar exploration of the present invention, its step comprises:
Driver module receives the control signal from a monitoring client, and drives radar module according to this control signal, makes this radar module at the planar movement of a surveyed area;
During at this surveyed area, radar module sends a pulse signal to this surveyed area when the radar module position;
Radar module receives from a target echo of this surveyed area reflection, and calculates corresponding specific inductive capacity according to this target echo after processing, and described specific inductive capacity is sent to monitoring client; And
The specific inductive capacity that the monitoring client basis receives is in order to carry out corresponding to produce an examining report with a moisture corresponding relation.
Compared with prior art, use the present invention, solved the current problem that can't directly reflect the actual grain feelings of the inner each point of silo, scan by the grain of ground penetrating radar exploration to moisture skewness in silo, extract the relevant pulse signal (as target echo) that returns and produce examining report, thereby reach the purpose of the Measurement for Grain Moisture Content distribution of learning in silo, improved the efficiency of management of grain storage and transportation environment.
Description of drawings
Fig. 1 is the system block diagrams that the present invention is based on the stored grain moisture on-line measuring device of ground penetrating radar exploration.
Fig. 2 a and Fig. 2 b are the method flow diagram that the present invention is based on the stored grain moisture online test method of ground penetrating radar exploration.
Fig. 3 is the enforcement schematic diagram that the present invention is based on the stored grain moisture on-line measuring device of ground penetrating radar exploration.
Fig. 4 is the schematic diagram of radar module of the present invention.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
Before the explanation stored grain moisture on-line measuring device and method thereof based on ground penetrating radar exploration provided by the present invention, first principle of the present invention is explained, well-known, the size of grain specific inductive capacity directly reflects the height of its moisture.Therefore, the present invention can detect what (being moisture) of inner relevant to the specific inductive capacity grain contained humidity of silo by the difference of the electromagnetic wave time of return of different in moisture content grain relatively, and the generation examining report supplies the user to browse.
See also Fig. 1, Fig. 1 is the system block diagrams that the present invention is based on the stored grain moisture on-line measuring device of ground penetrating radar exploration, comprising: radar module 10, driver module 20 and monitoring client 30.Wherein, radar module 10 is in order to position transmitted signal when the surveyed area, and the target echo that receives reflection from surveyed area, and calculate corresponding specific inductive capacity to be sent to monitoring client 30 according to the target echo after processing, described surveyed area is exactly the region of the stored grain (or being called grain heap to be measured) of wish detection.In addition, pulse signal is high-frequency electromagnetic pulsating wave (or being referred to as electromagnetic wave), and the target echo of reflection in the moisture of grain to be measured heap not simultaneously, can cause transfer rate there are differences.On reality was implemented, radar module 10 can comprise radar transmitter, emitting antenna, radar receiver, receiving antenna and controlled processing unit.wherein, radar transmitter is electrically connected with emitting antenna and controlled processing unit respectively, radar receiver respectively with receiving antenna, the controlled processing unit electrical connection, emitting antenna and receiving antenna relative position are fixed, and two antenna ports are in same level, and the plane parallel of maintenance and surveyed area, the controlled processing unit combined data, and processing related data, as: process pulse signal and target echo, calculate corresponding specific inductive capacity or to the coupled waves of emitting antenna and receiving antenna, the bulkhead reflection wave, surface echo, clutter reaches the target echo parameter is compensated processing, the non-target echo that affects testing result is compensated, help like this to improve the accuracy of test result.In addition, controlled processing unit possesses communication interface (as: RS-232, Ethernet, Wi-Fi, GPRS...... etc.), in order to the related data of processing is sent to monitoring client 30.
Be noted that especially in order effectively to distinguish grain different in moisture content distribution situation, can metal ground plane be set in the grain depot bottom, that is to say at grain depot bottom setting location of short circuit, all return when pulse signal runs into location of short circuit.Because the aerial time of return of microwave is known, thereby can calculates microwave reflection and the mistiming of returning and learn specific inductive capacity.Then, funtcional relationship by relative dielectric constant and moisture just can effectively distinguish according to specific inductive capacity the distribution situation that Measurement for Grain Moisture Content is more or less the same, and can distinguish in theory corresponding relative dielectric constant and be the corresponding moisture of medium of " 1.5 " (relative dielectric constant of general grain dry is greater than 3).
See also Fig. 2 a and Fig. 2 b, Fig. 2 a and Fig. 2 b are the method flow diagram that the present invention is based on the stored grain moisture online test method of ground penetrating radar exploration, its step comprises: the control signal that driver module 20 receives from monitoring client 30, and drive radar module 10 according to this control signal, make radar module 10 at the planar movement (step 210) of surveyed area; When 10 of radar modules during at surveyed area, 10 pairs of surveyed area transmitted signals of radar module (step 220); Radar module 10 receives from the target echo of surveyed area reflection, and calculates corresponding specific inductive capacity according to target echo, and described specific inductive capacity is sent to monitoring client 30 (step 230); The specific inductive capacity that monitoring client 30 bases receive is in order to carry out corresponding to produce examining report (step 240) with the moisture corresponding relation.By above-mentioned steps, can scan the grain heap by pulse signal and calculate the specific inductive capacity of grain heap to be measured with basis with the difference of path transfer rate, and show the moisture distributed intelligence according to specific inductive capacity and moisture corresponding relation.
On reality was implemented, step 210 comprises the stepping assembly that drives on guide rail made itself and radar module 10 interlocks (step 211), and judges whether the stepping assembly is positioned at guide rail end points (step 212), if, stop or returning to (step 213), if not, execution in step 220.In addition, also comprise the generation alarm signal and be sent to monitoring client 30 (step 214) when the stepping assembly is positioned at the guide rail end points, described alarm signal can make the user who is positioned at monitoring client 30 learn that in real time the stepping assembly has been positioned at the guide rail end points.Step 230 also can be processed coupled waves, bulkhead reflection wave, surface echo, the clutter of emitting antenna and receiving antenna, and this target echo parameter is compensated (step 231) after receiving the target echo of reflection from surveyed area.In addition, after step 240, monitoring client 30 also can silos different from correspondence the three-dimensional geometry frame coordinates that stores in advance, in order to produce stored grain moisture distribution table by described specific inductive capacity, moisture corresponding relation and three-dimensional geometry frame coordinates, the Measurement for Grain Moisture Content (step 241) of the inner each point of reaction silo.
Below coordinate Fig. 3 and Fig. 4 to carry out following explanation in the mode of embodiment, please first consult Fig. 3, Fig. 3 is the enforcement schematic diagram that the present invention is based on the stored grain moisture on-line measuring device of ground penetrating radar exploration.The front is mentioned, and on reality was implemented, driver module 20 can comprise guide rail 21, programmable controller 22 and stepping assembly 23.When wish detected the grain heap, programmable controller 22 moved the stepping assembly 23 that startup is arranged at guide rail 21, made the radar module 10 that is bound to stepping assembly 23 move along guide rail 21 simultaneously, and it moves and grain heap plane parallel.and after moving to grain heap to be measured (being surveyed area), programmable controller 22 will drive radar module 10 and produce pulse signal, then after 10 pairs of surveyed area transmitted signals of radar module, to receive from surveyed area the target echo of reflection, and can calculate to obtain the data of specific inductive capacity to target echo by the controlled processing unit of radar module 10, programmable controller 22 also can determine whether to drive stepping assembly 23 according to the processing condition data of the controlled processing unit of radar module 10, for example: drive stepping assembly 23 when data are disposed, otherwise, do not drive stepping assembly 23.
From the above, after the controlled processing unit of radar module 10 obtains the data of specific inductive capacity, specific inductive capacity can be sent to monitoring client 30, obtained the moisture of relative dielectric constant by monitoring client 30 according to this specific inductive capacity from the moisture corresponding relation, and produce the examining report of the 3 D stereo distribution plan with moisture.In addition, in the bottom, warehouse, metal ground plane is set, when electromagnetic wave is sent to metal ground plane, total reflection occurs, can effectively distinguish the distribution situation that Measurement for Grain Moisture Content is more or less the same.
See also Fig. 4, Fig. 4 is the schematic diagram of radar module of the present invention.On reality was implemented, radar module 10 can comprise radar transmitter 12, emitting antenna 13, radar receiver 14, receiving antenna 15 and controlled processing unit 11.In the present invention, pulse signal and target echo are all pulsating wave (or claiming electromagnetic wave), and its difference is that pulse signal is the pulsating wave of emission, and target echo is the pulsating wave of reflection.Generally speaking, the transmitted signal is that radar transmitter 12 utilizes frequency electromagnetic waves (dominant frequency is that tens of megahertzes are to hundreds of megahertzes down to kilo-mega cycles per second) with broadband short pulse form, send into underground by emitting antenna 13, return to the grain heap surperficial after subsurface formations or the reflection of purpose body, by receiving antenna 15, radar receiver 14 are received, and carry out data by controlled processing unit 11 and process.Described pulsating wave stroke takes:
As the velocity of wave v in underground medium when being known, can be according to the accurate t value (ns) that measures.Obtained the degree of depth (m) of reflecting body by following formula.X in formula (m) value is half of emitting antenna and receiving antenna distance, fixes in section is surveyed; Z (m) value is the distance of reflection spot to emitting antenna 13 and receiving antenna 15 lines; V value (m/ns) can basis
Approximate calculating (when the conductance of medium is very low), wherein c is the light velocity (c=0.3m/ns), ε
rBe the relative dielectric constant value of medium, the latter can utilize ready-made data or measure and obtain.
In this embodiment, be transferred to the grain interface of different in moisture content when electromagnetic wave (being pulse signal), namely reflect, receiving antenna 15 receives electromagnetic wave (being target echo), and receiving electromagnetic mistiming t value record to the controlled processing unit 11 of rear end from being transmitted into, draw transfer rate v in medium after being calculated by controlled processing unit 11, and then extrapolate the relative dielectric constant of medium.
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 controlled processing unit 11, also can set by the user is on-the-spot according to standard.And the dielectric constant values of the grain that collects just compares with standard value at controlled processing unit 11, or follows corresponding regression curve, obtains corresponding moisture content value, and with mode stereo displays such as cromograms in monitoring client 30.
At last, supplementary notes be, the aforementioned three-dimensional geometry frame coordinates that monitoring client 30 stores corresponding different silos, its three-dimensional geometry frame coordinates (x of mentioning
i, y
i, z
i), mainly contain two effects:
(1) mutual relationship between coupled waves, bulkhead reflection wave, surface echo, clutter and target echo between different azimuth consideration emitting antenna 13 and receiving antenna 15.By controlled processing unit 11, the non-target echo that affects testing result is compensated afterwards, help like this to improve the accuracy of test result.
(2) for 3-D display moisture distribution plan, pick-up unit of the present invention needs each zone of the whole storage of scanning comprehensively.The precision of definition stepping assembly 23 is set each pulse step number of degrees according to actual conditions, and namely radar module 10 along guide rail 21 coasting distance r, reaches guide rail 21 rotational angle ω.Umber of pulse n (stepping period), radar module 10 coasting distances and guide rail 21 rotational angle threes determine the point (x that radar module 10 can scan in same plane φ
i, y
i).The zone that this orientation radar module 10 can scan is: crossing point (x between φ plane and storehouse substrate ground plane surfaces φ '
i, y
i) linear regions.After current azimuth scan was completed, monitoring client 30 sent order, and programmable controller 22 drives stepping assembly 23 and slides along guide rail 21 at reference frame, and same coordinate system shows that three-dimensional moisture distribution figure is in monitoring client 30.
In sum, as can be known the present invention and prior art between difference be to scan grain heap with according to calculate the specific inductive capacity of grain heap to be measured with the difference of path transfer rate by pulse signal, and show the moisture distributed intelligence according to specific inductive capacity and moisture corresponding relation, can solve the existing problem of prior art by this technological means, and then reach the technique effect of the efficiency of management that improves the grain storage and transportation environment.
Although the present invention with aforesaid embodiment openly as above; yet it is not to limit the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; when can do a little change and modification, therefore scope of patent protection of the present invention must be looked this instructions appending claims person of defining and is as the criterion.
Claims (10)
1. the stored grain moisture on-line measuring device based on ground penetrating radar exploration, is characterized in that, comprising:
Radar module sends a pulse signal when the surveyed area in order to the position, and a target echo that receives reflection from this surveyed area, and calculates corresponding specific inductive capacity to transmit according to this target echo after processing;
Driver module is in order to drive this radar module at the planar movement of this surveyed area according to a control signal; And
Monitoring client controls signal to driver module in order to transmit this, and receives the specific inductive capacity from this radar module, and carries out corresponding to produce an examining report according to described specific inductive capacity and a moisture corresponding relation.
2. the stored grain moisture pick-up unit based on ground penetrating radar exploration as claimed in claim 1, it is characterized in that, this driver module comprises guide rail, programmable controller and stepping assembly, and wherein said guide rail parallel is arranged at the top, plane of this surveyed area; Described programmable controller receives this control signal and makes driver module and radar module interlock with the stepping assembly that drives on guide rail, and stops when the stepping assembly is positioned at the guide rail end points or return; The step number of described stepping assembly and direction are positioned and are controlled by this programmable controller.
3. the stored grain moisture on-line measuring device based on ground penetrating radar exploration as claimed in claim 1, it is characterized in that, this monitoring client stores the three-dimensional geometry frame coordinates of corresponding different silos, this monitoring client produces stored grain moisture distribution table according to described specific inductive capacity, moisture corresponding relation and three-dimensional geometry frame coordinates, the Measurement for Grain Moisture Content of the inner each point of reaction silo.
4. the stored grain moisture on-line measuring device based on ground penetrating radar exploration as claimed in claim 1, is characterized in that, this moisture corresponding relation derives from the funtcional relationship of relative dielectric constant and moisture.
5. the stored grain moisture on-line measuring device based on ground penetrating radar exploration as claimed in claim 1, is characterized in that, this examining report is the 3 D stereo distribution plan of moisture.
6. stored grain moisture online test method based on ground penetrating radar exploration, its step comprises:
Driver module receives the control signal from a monitoring client, and drives radar module according to this control signal, makes this radar module at the planar movement of a surveyed area;
During at this surveyed area, radar module sends a pulse signal to this surveyed area when the radar module position;
Radar module receives from a target echo of this surveyed area reflection, and calculates corresponding specific inductive capacity according to this target echo after processing, and described specific inductive capacity is sent to monitoring client; And
The specific inductive capacity that the monitoring client basis receives is in order to carry out corresponding to produce an examining report with a moisture corresponding relation.
7. the stored grain moisture online test method based on ground penetrating radar exploration as claimed in claim 6, wherein this radar module makes itself and this radar module interlock in the step of the planar movement of a surveyed area for driving a stepping assembly on a guide rail, and stops when the stepping assembly is positioned at the guide rail end points or return.
8. the stored grain moisture online test method based on ground penetrating radar exploration as claimed in claim 7, also comprise the step that produces an alarm signal and be sent to monitoring client when wherein this stepping assembly is positioned at the guide rail end points.
9. the stored grain moisture online test method based on ground penetrating radar exploration as claimed in claim 6, wherein this radar module is processed coupled waves, bulkhead reflection wave, surface echo, the clutter of emitting antenna and receiving antenna, and this target echo parameter is compensated.
10. the stored grain moisture online test method based on ground penetrating radar exploration as claimed in claim 6, wherein this monitoring client stores the three-dimensional geometry frame coordinates of corresponding different silos, this monitoring client produces stored grain moisture distribution table according to described specific inductive capacity, moisture corresponding relation and three-dimensional geometry frame coordinates, the Measurement for Grain Moisture Content of the inner each point of reaction silo.
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| 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 |
| CN104899854A (en) * | 2014-03-05 | 2015-09-09 | 航天信息股份有限公司 | Detection method and detection device of grain piling height line |
| CN105574770A (en) * | 2014-10-16 | 2016-05-11 | 航天信息股份有限公司 | Method and device for carrying out comprehensive management to grain warehousing |
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| CN109557112A (en) * | 2018-06-08 | 2019-04-02 | 中国科学院南京土壤研究所 | Grain moisture content measuring device and grain moisture content measurement method |
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| CN104899854A (en) * | 2014-03-05 | 2015-09-09 | 航天信息股份有限公司 | Detection method and detection device of grain piling height line |
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| CN105574770A (en) * | 2014-10-16 | 2016-05-11 | 航天信息股份有限公司 | Method and device for carrying out comprehensive management to grain warehousing |
| CN104656154A (en) * | 2015-03-13 | 2015-05-27 | 厦门大学 | Common-emitting source ground penetrating radar multi-offset data automatic and quick measurement system |
| 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 |
| CN106872490A (en) * | 2017-03-10 | 2017-06-20 | 四川莱源科技有限公司 | Moisture content tester based on radar |
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| CN109557112A (en) * | 2018-06-08 | 2019-04-02 | 中国科学院南京土壤研究所 | Grain moisture content measuring device and grain moisture content measurement method |
| CN109557112B (en) * | 2018-06-08 | 2020-08-28 | 中国科学院南京土壤研究所 | Grain water content measuring device and grain water content measuring method |
| CN109444875A (en) * | 2018-09-19 | 2019-03-08 | 厦门精益远达智能科技有限公司 | Silo monitoring method, device, equipment and system based on radar migration imaging |
| CN109444875B (en) * | 2018-09-19 | 2020-06-02 | 厦门精益远达智能科技有限公司 | Granary monitoring method, device, equipment and system based on radar offset imaging |
| CN109632832A (en) * | 2019-01-23 | 2019-04-16 | 浙江大学 | A kind of cereal moisture percentage measuring device based on frequency sweep microwave penetration method |
| CN112345559A (en) * | 2019-08-06 | 2021-02-09 | 中国农业机械化科学研究院 | Online grain moisture detection device and detection method of combine harvester |
| CN111707679A (en) * | 2020-06-24 | 2020-09-25 | 哈尔滨理工大学 | Grain bin corn water content detection method based on X wave band |
| CN116755088A (en) * | 2023-08-09 | 2023-09-15 | 中国科学院空天信息创新研究院 | Granary depth and foreign matter detection and imaging method based on radar |
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