CN201194007Y - Edge electric field grain moisture tester based on CAN bus - Google Patents
Edge electric field grain moisture tester based on CAN bus Download PDFInfo
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- CN201194007Y CN201194007Y CNU2008200346669U CN200820034666U CN201194007Y CN 201194007 Y CN201194007 Y CN 201194007Y CN U2008200346669 U CNU2008200346669 U CN U2008200346669U CN 200820034666 U CN200820034666 U CN 200820034666U CN 201194007 Y CN201194007 Y CN 201194007Y
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- fringe field
- moisture content
- water content
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Abstract
The utility model discloses a fringe electrical field watery food tester based on CAN bus, which comprises a host computer node (1), a water content sensor node (2) and a CAN bus driver (4,10). A controller LAN formed by connecting the water content sensor node (2) to the host computer node (1) through the CAN bus driver (4,10) adopts master-slaver mode to implement data communication, and other slave nodes (9) can be accessed to the net through the bus driver according to need. The water content sensor node (2) is a fringe electrical field type water content sensor. A fringe electrical field plane capacitor (15) is made on a single side PCB plate with the gap between the capacitor plates is 3-6mm. The tester in the utility model can be used in multiple site measurement for grain depot water content and net monitoring, achieves the advantages of high anti-interference capacity and accurate measurement data.
Description
Technical field
The utility model relates to watery food tester, is specifically related to a kind of fringe field grain moisture content analyser based on the CAN bus.
Background technology
Grain is the valuable cargo that involves the interests of the state and the people.The water cut of grain all is an important indicator in processes such as harvesting, storage, circulation transportation, trade, processing, is not suitable for as moisture, and causing easily goes rotten goes bad, wish to remove moisture during weighing, try to achieve net weight, the grain processing process keeps certain moisture, could carry out well.Grain moisture content is the foundation of proofreading and correct output, estimates especially and makes amount, ensures the important indicator of grain security, and it is significant to measure grain moisture content immediately exactly.At present, the grain moisture content on-line testing has several different methods and device, but they are not the price higher positions is that speed is slow, or unstable properties, especially in foodstuff drying device, owing between test point (being sampling spot) and the main control system certain distance is arranged, sensor needs earlier the data of being sampled to be carried out pre-service, sends main frame to by certain mode subsequently and controls.Traditional capacitance type sensor is subjected to aspects such as electric capacity shape, grain elasticity when measuring influence is bigger.Use by the scene, communication modes such as employing RS485 carry out the on-line measurement of moisture content, and its antijamming capability is relatively poor.
Summary of the invention
The purpose of this utility model is: a kind of fringe field grain moisture content analyser based on the CAN bus is provided, adopt the networking of CAN bus to carrying out data communication between host node and the sensor node, effectively improve the antijamming capability of system in the transmission course, also other can be passed through the CAN driver access network from node simultaneously, realize networking control.
Technical solution of the present utility model is: this moisture teller comprises host node and the moisture sensor node that is connected by CAN bus driver network, and the moisture sensor node connects host node by the CAN bus driver.
In a kind of fringe field grain moisture content analyser based on the CAN bus of the present utility model, moisture sensor is a fringe field condenser type moisture sensor, the fringe field planar capacitor of on the single face pcb board, arranging, and the gap between capacitor plate is 3-6mm.
In a kind of fringe field grain moisture content analyser of the present utility model based on the CAN bus, connecting terminal display, clock monitor and keyboard is set on host-processor.
In a kind of fringe field grain moisture content analyser of the present utility model, also connect other sensor on the CAN bus network from node based on the CAN bus.
Moisture sensor is used for measuring the pairing capacitance size of grain moisture content under the fringe field effect, and electric capacity becomes the different frequency square-wave pulse after changing by appearance/frequency, behind the treated device counting, removes Temperature Influence, and these data are positioned in the working storage; When receiving the remote frame that main frame sends, sensor is issued processor with the data in the working storage and is handled and control; By network can measure in real time moisture content, read, conversion, demonstration and control; Host node also can carry out process control by the temperature of other nodes such as the collection of bake out temperature measured node; Can control parameters such as moisture content value and breed selection to system by keyboard is provided with.
The square wave output function of the design's appearance/frequency converter circuit use SE556 integrated chip obtains the square-wave pulse under the different electric capacity, measures corresponding moisture content value by the frequency of measuring square wave.
Owing to adopt fringe field to measure, its penetration power depends on the intensity of electric field, the pole plate distance is the size in slit and the length in slit, and sensor can be made various shape, as radioactive ray circle, concentric circles or square etc.
Sensor node of the present utility model can increase or reduce as required, host node is realized the control of sensor and the transmission of data, the moisture sensor node adopts the fringe field capacitor as moisture content sensing measurement element, gather temperature signal under the measurement environment by integrated temperature sensor, and the data of being surveyed are revised; Fringe field condenser type moisture sensor is a shape of determining the processing fringe field according to the size of grain, by the penetrability of fringe field and the homogeneity of grain population distribution, can effectively measure in the electric field owing to the different capacitance variations that cause of moisture content, take measures such as demarcation and temperature compensation, can obtain the numerical value of corresponding water percentage.
The utility model is that equipment such as grain heat-drying are had the cereal moisture content on-line determination instrument that uses in the environment of heavier interference in operation process, also can be used for grain depot moisture content multiple spot position and measures, and carries out networked control, and antijamming capability is strong, and measurement data is accurate.
Description of drawings
Fig. 1 is the utility model theory diagram.
Fig. 2 is a kind of part drawing of measuring electric capacity in Fig. 1 moisture sensor node.Among the figure: 1. host node, 2. moisture sensor node, 3. host node processor, 4. host node bus driver, 5. terminal display, 6. clock monitor, 7. keyboard is set, 8. controlling object, 9. other is from node N-2,10. moisture content node bus driver, 11. the moisture content modal processor, 12. environment temperature detecting devices, 13. clock monitors, 14. appearance/frequency converter, 15. moisture measurement capacitors.
Embodiment
As shown in Figure 1, 2, this moisture teller comprises host node 1, moisture sensor node 2 and CAN bus driver 4,10, moisture sensor node 2 connects host node 1 by CAN bus driver 4,10 and forms controller local area network, adopt primary and secondary structure to carry out data communication, as required can be by bus driver with other from node 9 access networks.
In a kind of fringe field grain moisture content analyser of the present utility model based on the CAN bus, moisture sensor node 2 is a fringe field condenser type moisture sensor, the fringe field planar capacitor 15 of arranging on the single face pcb board, the gap between capacitor plate is 3-6mm.Fig. 2 is a kind of capacitive transducer of shape wherein.
A kind of fringe field grain moisture content analyser of the present utility model based on the CAN bus, connecting terminal display 5, clock monitor 6 on the processor 3 in the host node 1, keyboard 7 and controlling object 8 are set, controlling object 8 for report to the police, the action of indication and other devices etc.
JA(junction ambient) Temperature Detector 12, clock monitor 13, appearance/frequency converter 14 and moisture content capacitor 15 on the processor 11 in a kind of fringe field grain moisture content analyser based on the CAN bus of the present utility model, the water sensor part node, the function of appearance/frequency converter are the frequencies that the value of moisture measurement electric capacity is converted to correspondence.
The square wave output function of the design's appearance/frequency converter circuit use SE556 integrated chip obtains the square-wave pulse under the different electric capacity, measures corresponding moisture content value by the frequency of measuring square wave.
Owing to adopt fringe field to measure, its penetration power depends on the intensity of electric field, the pole plate distance is the size in slit and the length in slit, and sensor can be made various shape, as radioactive ray circle, concentric circles or square etc.
Claims (5)
1. fringe field watery food tester based on the CAN bus, it is characterized in that: this moisture teller comprises host node (1), moisture sensor node (2) and CAN bus driver (4,10), and moisture sensor node (2) connects host node (1) by CAN bus driver (4,10).
2. a kind of fringe field grain moisture content analyser according to claim 1 based on the CAN bus, it is characterized in that: moisture sensor node (2) is a fringe field condenser type moisture sensor, processing fringe field planar capacitor on the single face pcb board, the gap between capacitor plate is 3-6mm.
3. a kind of fringe field grain moisture content analyser based on the CAN bus according to claim 1 is characterized in that: the processor (3) in the host node (1) is gone up connecting terminal display (5), clock monitor (6), keyboard (7) and controlling object (8) is set.
4. a kind of fringe field grain moisture content analyser based on the CAN bus according to claim 1 is characterized in that: the processor (11) in the moisture sensor node (2) is gone up JA(junction ambient) Temperature Detector (12), clock monitor (13), appearance/frequency converter (14) and moisture content capacitor (15).
5. a kind of fringe field grain moisture content analyser based on the CAN bus according to claim 1 is characterized in that: bus driver (4) is gone up and is connected other from node (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200346669U CN201194007Y (en) | 2008-04-18 | 2008-04-18 | Edge electric field grain moisture tester based on CAN bus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200346669U CN201194007Y (en) | 2008-04-18 | 2008-04-18 | Edge electric field grain moisture tester based on CAN bus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201194007Y true CN201194007Y (en) | 2009-02-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200346669U Expired - Fee Related CN201194007Y (en) | 2008-04-18 | 2008-04-18 | Edge electric field grain moisture tester based on CAN bus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201194007Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103697919A (en) * | 2013-12-30 | 2014-04-02 | 合肥工业大学 | Planar capacitive sensor measuring system based on DSP (Digital Signal Processor) |
| CN105548283A (en) * | 2015-12-08 | 2016-05-04 | 林国明 | Uniplanar-capacitance measuring plate and capacitive detection unit |
| CN105758902A (en) * | 2016-05-20 | 2016-07-13 | 南京信息工程大学 | Water content measuring probe based on PCB and electric field marginal effect, and manufacturing method of water content measuring probe |
-
2008
- 2008-04-18 CN CNU2008200346669U patent/CN201194007Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103697919A (en) * | 2013-12-30 | 2014-04-02 | 合肥工业大学 | Planar capacitive sensor measuring system based on DSP (Digital Signal Processor) |
| CN103697919B (en) * | 2013-12-30 | 2016-01-13 | 合肥工业大学 | A kind of planar capacitance sensor measuring system based on DSP |
| CN105548283A (en) * | 2015-12-08 | 2016-05-04 | 林国明 | Uniplanar-capacitance measuring plate and capacitive detection unit |
| CN105758902A (en) * | 2016-05-20 | 2016-07-13 | 南京信息工程大学 | Water content measuring probe based on PCB and electric field marginal effect, and manufacturing method of water content measuring probe |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090211 Termination date: 20120418 |