CN1093801A - Sectional capacitance formula thing position detecting method and detection rapier thereof - Google Patents
Sectional capacitance formula thing position detecting method and detection rapier thereof Download PDFInfo
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- CN1093801A CN1093801A CN 94100133 CN94100133A CN1093801A CN 1093801 A CN1093801 A CN 1093801A CN 94100133 CN94100133 CN 94100133 CN 94100133 A CN94100133 A CN 94100133A CN 1093801 A CN1093801 A CN 1093801A
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Abstract
A kind of sectional capacitance formula thing position detecting method and detection rapier thereof, detect with digital combining with analogue technique, after detecting each section electric capacity respectively, judge full segment, empty material section and part material section with digital technology earlier, calculate the position of charge level in part material section with simulation again, the length overall that adds full segment is as actual thing position.Whole rapier is the segment electrode that is equated by each segment length, and independent each segment electrode of lead-in wire that series arrangement is fixed on the same insulator constitutes.Measuring accuracy height of the present invention must actual thing bit correction, is not subjected to the influence of material kind, character, moisture, so applied range.
Description
The technical field of the invention is non electrical quantity survey technology or sensor technology.
The method that capacitive level probe generally uses at present is, utilizes between the metal electrode that places feed bin and the bulkhead to constitute electric capacity, and tested material is as medium, and the thing position changes the variation that produces electric capacity and detects the thing position.Factors such as because tested material is of a great variety, the different specific inductive capacity of character is with material component, moisture and changing.Used electrical capacitance levelmeter rapier all is a monolithic devices rapier (see figure 1) at present, this monolithic devices rapier and bulkhead form and detect electric capacity, detect the variation of thing position with the variation of this electric capacity, because of influenced by specific inductive capacity, then identical thing position, the electric capacitance change difference that causes causes the testing result error bigger, sometimes measurement result may lose meaning fully, so range of application is restricted.In addition,, therefore difficult when its thing position zero point and full scale value must and be bought securities with all one's capital at the feed bin hole capital after selling all securities to this capacitance object position meter calibrating and marked ratio with manual measurement.
Purpose of the present invention, because of existing the problems referred to above not satisfy, prior art produces actual needs, the present inventor has broken through traditional monolithic devices rapier and has detected the method for electric capacity merely with analogue technique, and invents a kind of distributed capacitance formula thing position detecting method and detect rapier.
Ultimate principle of the present invention is to combine with analogue technique with numeral and carry out the detection of thing position.After detecting each section electric capacity respectively, judge full segment with digital technology earlier, empty material section, and part material section is an interface section.Completely expect benchmark with sky material section and full segment electric capacity difference as section again, calculate the position of charge level, add that the full segment length overall is as actual thing position in part material section (being the interface) with simulation.
Its computing formula:
Lx＝Lo（a+ (Cy)/(Cx) ）;
Lx-is that actual measurement goes out the thing position;
Each segment electrode length of Lo-;
The hop count of the full segment when a-is actual measurement;
Cx-is the difference of single full segment capacitance and single empty material section capacitance;
Cy-is the difference of part material section (interface section) capacitance and single empty material section capacitance.
Rapier structure of the present invention is: whole range rapier is the segment electrode that is equated by each segment length, and series arrangement is fixed on the sectional capacitance formula gamut thing position detection rapier that independent each section of the lead-in wire capacitance electrode on the same insulator is constituted.This rapier agent structure can be single flexible or rigidity, also can each section serial connection constitute.
The present invention's its advantage compared with the prior art is:
1, the present invention changes as thing position testing result with the rapier total capacitance, but determine the thing position with relativeness between each section electric capacity, therefore relativeness is not subjected to the influence of material specific inductive capacity between each section electric capacity, just be not subjected to the material kind, character, factors such as moisture content make it to use general enclosing extensively to the influence of measurement result.
2, the present invention is the rapier that detects the thing position with the distributed capacitance formula, and it is made up of the segment electrode that some equal segments independently go between.If whole rapier is made up of the M segment electrode, expect completely that then empty material judges that its precision reaches 1/ (M).The ratio that has the material part to account for this section as interface section is 1/ (n), and then the precision of whole range just reaches 1/ (Mn).Whole rapier range is certain, and then the section capacitance electrode number of independent lead-in wire is many more, and precision is high more.This advantage is that close technology is difficult for realizing.
3, this distribution capacitance object position detection method and detection rapier thereof are applicable to the thing position detection of solid particle or liquid.Do not need actual thing bit correction.Just install and to use, guarantee precision for a long time.Accompanying drawing:
Electric capacity rapier structural representation in Fig. 1 prior art;
The rapier structural representation is detected in Fig. 2 distributed capacitance formula of the present invention thing position.
Distributed capacitance formula thing position detecting method of the present invention is, adopting numeral and analogue technique to carry out the thing position detects, after detecting each section electric capacity respectively, earlier judge full segment with digital technology, empty material section, and part material section (interface section), again with the difference of sky material section and full segment electric capacity as benchmark, calculate the position of interface with simulation at this section.Add the full segment total length, be actual detected thing position.
Detect rapier among the present invention and be made up of the segment electrode 1 of M section equal length Lo, it is fixed on the insulation tube 2 from top to bottom successively.This M representative is greater than 1 positive integer, and then to detect the total range of rapier be MLo in this thing position, and when rapier is loaded in the feed bin 5, its rapier bottom is positioned at feed bin bottom 6, is example explanation distributed capacitance formula thing position detection technique when being positioned at the 5th section with interface 7.
Detect multistage electrode capacitance value from bottom to up successively, it is Co that feed bin 5 tops do not have material segment section electrode 1 promptly empty material section capacitance, and the bottom expects that completely segment section electrode 1 capacitance is that the full segment capacitance is Co+Cx.Interface material segment electrode capacitance is Co+Cy, and Cy is less than Cx.From measurement result as can be known the 1-4 section be full segment, its total length is 4Lo, the 5th section is interface section 7, and the material partial-length is arranged is (Cy)/(Cx) Lo, the position of hence one can see that thing plane is:
Lx＝4Lo+Lo· (Cy)/(Cx)
Because boundary's electric constant difference Cx then, the absolute value difference of Cy, but (Cy)/(Cx) relative value has then been eliminated the influence of specific inductive capacity.
So Lx=Lo(4+ (Cy)/(Cx)) this result is not subjected to the influence of factors such as material kind, character, moisture.
If the hop count of full segment when representing actual measurement with a, a is a positive integer, and then the method using formula of distributed capacitance formula detection thing position is
Lx＝Lo（a+ (Cy)/(Cx) ）
Cx is full segment segment electrode capacitance and empty difference of expecting section segment electrode capacitance in the formula.
Cy is interface section 7 segment electrode capacitances and empty difference of expecting section segment electrode capacitance.
Realize the used rapier structure of this method: it has been broken through the monolithic construction rapier of traditional type and has seen Fig. 1, but segment electrode 1 series arrangement that is equated by each segment length is fixed on the insulation tube 2, each section capacitance electrode 1 independent lead-in wire 3, in insulation tube 2, cause in the top box 4, deliver to digital calculator and demonstration again, so just constitute a sectional capacitance formula gamut thing position and detect rapier.This rapier can be single flexible or rigid structure, and for the ease of transportation, each section serial connection constitutes but install also.
Distributed capacitance formula thing position detecting method of the present invention and detect rapier measuring accuracy height must actual thing bit correction, is not subjected to the influence of material kind, character, moisture content, so applied range.
Claims (5)
1, a kind of sectional capacitance formula thing position detecting method, it is characterized in that it be with numeral with simulate technology and combine and carry out thing position detection, after detecting each section electric capacity respectively, earlier judge full segment with digital technology, empty material section, and partly the material section is an interface section, completely expects benchmark with sky material section and full segment electric capacity difference as section again, calculate the position of charge level with simulating method, add that the full segment length overall is as actual thing position in part material section (being the interface).
2, according to the said sectional capacitance formula of claim 1 thing position detecting method, it is characterized in that the computing formula of the method gains position is:
Lx＝Lo（a+ (Cy)/(Cx) ）;
Lx-is that actual measurement goes out the thing position;
Each segment electrode length of Lo-;
The hop count of the full segment when a-is actual measurement;
Cx-is the difference of single full segment capacitance and single empty material section capacitance;
Cy-is the difference of part material section (interface section) capacitance and single empty material section capacitance.
3, a kind of rapier of realizing sectional capacitance formula thing position detecting method is characterized in that whole range rapier is the segment electrode that is equated by each segment length, and series arrangement is fixed on that independent each section of lead-in wire capacitance electrode on the same insulator constituted.
4, detect rapier according to the said sectional capacitance formula of claim 3 thing position, it is characterized in that this rapier agent structure is single flexible or rigidity.
5, detect rapier according to the said sectional capacitance formula of claim 3 thing position, it is characterized in that this rapier agent structure constitutes for each section serial connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94100133 CN1033604C (en) | 1994-01-14 | 1994-01-14 | Sectional capacitance object-position detecting method and detecting probe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94100133 CN1033604C (en) | 1994-01-14 | 1994-01-14 | Sectional capacitance object-position detecting method and detecting probe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1093801A true CN1093801A (en) | 1994-10-19 |
| CN1033604C CN1033604C (en) | 1996-12-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94100133 Expired - Fee Related CN1033604C (en) | 1994-01-14 | 1994-01-14 | Sectional capacitance object-position detecting method and detecting probe |
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| CN (1) | CN1033604C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102607668A (en) * | 2012-04-19 | 2012-07-25 | 北京航空航天大学 | Capacitance sensor |
| CN102944287A (en) * | 2012-11-23 | 2013-02-27 | 水利部南京水利水文自动化研究所 | Capacitance type flexible electronic tide staff |
| CN103196515A (en) * | 2013-04-03 | 2013-07-10 | 集美大学 | Wave and tide level testing device |
| CN107478295A (en) * | 2017-07-28 | 2017-12-15 | 深圳市鼎丰泰达科技有限公司 | A kind of method and device that liquid level data is obtained in capacitance level transducer |
| CN108225480A (en) * | 2018-01-16 | 2018-06-29 | 重庆邮电大学 | Non-contact liquid volume measuring method based on linear type capacitive liquid level sensor |
| CN109708720A (en) * | 2018-12-25 | 2019-05-03 | 北京晨淼科技有限公司 | Fire-truck water tank water level detecting system |
-
1994
- 1994-01-14 CN CN 94100133 patent/CN1033604C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102607668A (en) * | 2012-04-19 | 2012-07-25 | 北京航空航天大学 | Capacitance sensor |
| CN102944287A (en) * | 2012-11-23 | 2013-02-27 | 水利部南京水利水文自动化研究所 | Capacitance type flexible electronic tide staff |
| CN103196515A (en) * | 2013-04-03 | 2013-07-10 | 集美大学 | Wave and tide level testing device |
| CN107478295A (en) * | 2017-07-28 | 2017-12-15 | 深圳市鼎丰泰达科技有限公司 | A kind of method and device that liquid level data is obtained in capacitance level transducer |
| CN108225480A (en) * | 2018-01-16 | 2018-06-29 | 重庆邮电大学 | Non-contact liquid volume measuring method based on linear type capacitive liquid level sensor |
| CN109708720A (en) * | 2018-12-25 | 2019-05-03 | 北京晨淼科技有限公司 | Fire-truck water tank water level detecting system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1033604C (en) | 1996-12-18 |
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