CN203259106U - Sectional mutual-capacitance displacement sensor for monitoring roof separation - Google Patents
Sectional mutual-capacitance displacement sensor for monitoring roof separation Download PDFInfo
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- CN203259106U CN203259106U CN 201320283968 CN201320283968U CN203259106U CN 203259106 U CN203259106 U CN 203259106U CN 201320283968 CN201320283968 CN 201320283968 CN 201320283968 U CN201320283968 U CN 201320283968U CN 203259106 U CN203259106 U CN 203259106U
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Abstract
The utility model discloses a sectional mutual-capacitance displacement sensor for monitoring roof separation, comprising fixed polar plates, a sliding polar plate and a capacitance measuring circuit, wherein the fixed polar plates are of sectional conductive unit structures, the number of the fixed polar plates is 2-50, the sectional conductive units comprise receiving electrodes and emitting electrodes, the receiving electrodes are independent from each other, the emitting electrodes are connected together to form a general emitting electrode of the fixed polar plates, and the general emitting electrode and the receiving electrodes are connected with the capacitance measuring circuit; and the number of the sliding polar plate is 1, the sliding polar plate is covered on the sectional conductive units and is connected with measuring ropes at a deep base point and a shallow base point. The fixed polar plates of the sectional mutual-capacitance displacement sensor adopt the sectional conductive unit structures, the total length of the fixed polar plates is equal to the sum of a length to be measured and the length of the sliding polar plate and is far less than twice of the existing length to be measured; further, the absolute error of measurement is less than a maximum error in the measurement of the sliding polar plate and one of the sectional conductive unit.
Description
Technical field
The utility model belongs to coal measure strata down-hole roadway roof absciss layer monitoring technical field, is specifically related to
OnePlant the segmentation mutual capacitance type displacement transducer that is used for roof delamination monitoring.
Background technology
The involved sensor of at present coal measure strata down-hole back surrounding rock separation layer monitoring mainly is displacement transducer, can be divided into several classes such as resistor type displacement sensor, capacitive displacement transducer, inductive displacement transducer, grating, magnetic grid, capacitive displacement transducer and magnetostrictive displacement sensor by the monitoring principle displacement transducer.What wherein, research was more is: 1) resistor type displacement sensor.That this sensor has is simple in structure, gather the characteristics such as convenient; 2) photoelectricity, magnetoelectricity pulse code displacement transducer.Such sensor essence is an incremental displacement sensor, can not record the absolute position, and when microprocessor is disturbed when resetting, this sensor can't be determined the absolute position; 3) grating displacement sensor.This sensor cost is higher, and precision can reach μ m level, but so high measuring accuracy and be not suitable for the roof rock delamination monitoring in down-hole tunnel.
Capacitance type sensor has that dissipated power is little, output impedance is low, electrostatic attraction is little, dynamic property is good and the characteristics such as sensitivity is high, the capacity of electric capacity and the distance between the two-plate are inversely proportional to, be directly proportional with the specific inductive capacity of medium between the two-plate, utilize this characteristic, can make various types of capacitance type sensors.When capacitance type sensor measurement displacement is larger, present capacitance type sensor is mainly and becomes dielectric capacitor type displacement transducer and area-changing capacitance displacement transducer, its major defect is: 1) length of sensor is greater than 2 times of length to be measured, and size sensor is larger; 2) measuring absolute error increases along with the increase of length to be measured.
Summary of the invention
The utility model purpose is to overcome shortcomings and deficiencies of the prior art, and the segmentation mutual capacitance type displacement transducer that is used for roof delamination monitoring that a kind of sensor length size is short, the displacement measurement absolute error is little is provided.
For achieving the above object, the utility model adopts following solution: a kind of segmentation mutual capacitance type displacement transducer for roof delamination monitoring, comprise fixed polar plate, slip pole plate and capacitance measurement circuit, it is characterized in that: fixed polar plate is sectional type conductive unit structure, quantity is 2-50, and the sectional type conductive unit comprises receiving electrode and emitting electrode, and the receiving electrode width is B, length is L, 100mm〉B〉4mm, 100mm〉L〉4mm, be shaped as circular or square, material is the metallic conduction material, receiving electrode is separate, and the emitting electrode width is C, and length is L, 100mm〉C〉4mm, be shaped as circle or square, material is the metallic conduction material, and emitting electrode links together, consist of total emitting electrode of fixed polar plate, total emitting electrode is connected capacitance measurement circuit with receiving electrode; The slip plate width is D, length is A, D〉B, 2L〉A〉L, be shaped as circle or square, material is the metallic conduction material, quantity is one, the slip pole plate can only cover two sectional type conductive units at most simultaneously during displacement measurement, and the slip pole plate connects the lining rope of dark basic point and shallow foundation point, does not connect capacitance measurement circuit.
Principle of work of the present utility model: during displacement measurement, the frequency signal of the emitting electrode of fixed polar plate emission 10-1000KHz, according to the computing formula of parallel capacitance, the electric capacity between total emitting electrode and the receiving electrode is
In the formula:
SBe coupling area;
δBe the pole plate distance between total emitting electrode and the receiving electrode;
εBe specific inductive capacity.Not covering place of slip pole plate, the electric capacity between total emitting electrode and the receiving electrode is C
Min, numerical value is less; Covering place of slip pole plate, the existence of slip pole plate has increased the coupling area between total emitting electrode and the receiving electrode, has namely increased the electric capacity between total emitting electrode and the receiving electrode.When the slip pole plate is in a certain position, the capacitor C between total emitting electrode and the receiving electrode
i, C
I+1For
In the formula:
XBe the relative displacement of slip pole plate with the first sectional type conductive unit that has covered.
The slip pole plate sectional type conductive unit receiving electrode voltage of covering place is U
i, U
I+1
(5)
In the formula: K, K
1Be the constant relevant with insulation thickness, specific inductive capacity, frequency and input impedance etc.Adopt ratioing technigue to eliminate the factors such as insulation thickness and specific inductive capacity to the impact of displacement measurement, can be got by formula (4) and formula (5)
According to the position of i piece sectional type conductive unit, and the relative displacement of slip pole plate and first sectional type conductive unit having covered
X, the total displacement of the pole plate that obtains sliding
Compared with prior art, the utlity model has following advantage:
1. a kind of segmentation mutual capacitance type displacement transducer for roof delamination monitoring of the utility model, its total length equals length to be measured+sliding electrode length.If length to be measured is divided into ten sections, then the sensor total length is less than 1.1 times of length to be measured, much smaller than 2 times of length to be measured of existing capacitive displacement transducer.
2. a kind of segmentation mutual capacitance type displacement transducer for roof delamination monitoring of the utility model, measuring absolute error does not increase with the increase of length to be measured.No matter sensor how long, and absolute error is all less than the maximum error of slip pole plate when wherein a certain sectional type conductive unit is measured.If the error of slip pole plate when wherein a certain sectional type conductive unit is measured is 5%, fixed polar plate length is 20mm, and then no matter sensor length is for how long, and maximum error of measuring can not surpass 1mm.
3. a kind of segmentation mutual capacitance type displacement transducer for roof delamination monitoring of the utility model has reduced the requirement to metering circuit.If total length to be measured is 200mm, require maximum error to be no more than 1mm, adopt the measuring error of existing measuring method less than 5%; Adopt ten segmentations in the utility model, namely during each segmentation 20mm, then measuring error is less than 0.5%, and the error requirements of measuring system has been reduced by 10 times.
4. a kind of segmentation mutual capacitance type displacement transducer for roof delamination monitoring of the utility model has utilized the principle of mutual capacitance, and the slip pole plate only needs a conductive material, need not introduce circuit during measurement, and the pole plate that therefore slides is lead-in wire not.
5. a kind of segmentation mutual capacitance type displacement transducer for roof delamination monitoring of the utility model has adopted the measuring method of voltage ratio, can reduce the impact of the parameters such as insulation thickness and specific inductive capacity on measuring, and simplifies manufacture craft.
6. a kind of segmentation mutual capacitance type displacement transducer for roof delamination monitoring of the utility model, fixed polar plate and slip pole plate can be made the various shapes such as circular or square, to satisfy the needs of different occasions.
7. a kind of segmentation mutual capacitance type displacement transducer for roof delamination monitoring of the utility model, be widely used in coal measures bottom down-hole roadway supported by bolt roof delamination monitoring, and the aspects such as tunnel chamber roof delamination monitoring of the large-scale structures such as tunnel, mine working, underground power station and oil-gas depot or buildings.
Description of drawings
Fig. 1 is principle schematic of the present utility model.
Fig. 2 is the structural representation of sectional type conductive unit.
Among the figure: 1-fixed polar plate, 2-slip pole plate, 3-capacitance measurement circuit
4-total emitting electrode 5-receiving electrode 6-emitting electrode.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples.
Embodiment 1:As shown in Figure 1 and Figure 2, present embodiment segmentation mutual capacitance type displacement transducer comprises fixed polar plate 1, slip pole plate 2 and capacitance measurement circuit 3, wherein, fixed polar plate 1 is sectional type conductive unit structure, quantity is five, the sectional type conductive unit comprises receiving electrode 5 and emitting electrode 6, and receiving electrode 5 width are 12.7mm, and length is 24.8mm, be shaped as square, material is copper, and emitting electrode 6 width are 12.7mm, and length is 24.8mm, every block gap 0.2mm, be shaped as squarely, material is copper, fixed polar plate 1 total length 125mm; Slip pole plate 2 width are 30mm, and length is 24.8mm, and quantity is one, are shaped as squarely, and material is copper, and slip pole plate 2 can only cover two sectional type conductive units at most simultaneously during displacement measurement; The emitting electrode 6 of each sectional type conductive unit links together, and consists of total emitting electrode 4 of fixed polar plate 1, and the receiving electrode 5 of each sectional type conductive unit is separate, and total emitting electrode 4 is connected with receiving electrode and is connected capacitance measurement circuit 3; Slip pole plate 2 connects the lining rope of dark basic point and shallow foundation point, does not connect capacitance measurement circuit 3.
The course of work of present embodiment: during displacement measurement, the electric capacity between total emitting electrode 4 of this moment fixed polar plate 1 of capacitance measurement circuit 3 measurements and the receiving electrode 5 of each sectional type conductive unit.In 2 coverings place of slip pole plate, the capacitor C between total emitting electrode 4 of fixed polar plate 1 and the receiving electrode 5 of two sectional type conductive units
3, C
4Be respectively 85pF, 112pF; In 2 not coverings place of slip pole plate, the capacitor C between total emitting electrode 4 of fixed polar plate 1 and the receiving electrode 5 of sectional type conductive unit
MinBe 4 pF, find out C
3C
MinThe sectional type conductive unit, this residing position of sectional type conductive unit is the interval displacement of slip pole plate 2, its value
Be 49.6mm; According to formula (7), calculate the relative displacement 13.7mm of slip pole plate 2 and the first sectional type conductive unit that has covered, thereby the total displacement of the pole plate 2 that obtains sliding is 63.3mm.
The maximum error of measuring of this sectional capacitor type displacement transducer is 0.95mm, at certain mine 15
#Use better in the roof delamination monitoring of coal seam 1501 workplace haulage gates.
Embodiment 2:The fixed polar plate 1 of present embodiment adopts the silk-screen mode, to conduct electricity slurry according to accompanying drawing is printed on the horizontal arm of mechanical type roof separation indicator (circle), after having printed conductive layer, apply a layer insulating, the extension line of sectional type conductive unit adopts flexible print cable to guide to capacitance measurement circuit, and main chip is AD7153.Slip pole plate 2 adopts circular conductive material to make.The maximum error of measuring of this embodiment is 1.12mm, at certain mine 15
#Use better in the roof delamination monitoring of coal seam 1501 workplace air return way.The other the same as in Example 1.
Claims (1)
1. segmentation mutual capacitance type displacement transducer that is used for roof delamination monitoring, comprise fixed polar plate, slip pole plate and capacitance measurement circuit, it is characterized in that: fixed polar plate is sectional type conductive unit structure, quantity is 2-50, the sectional type conductive unit comprises receiving electrode and emitting electrode, the receiving electrode width is B, and length is L, 100mm〉B〉4mm, 100mm〉L〉4mm, be shaped as circle or square, material is the metallic conduction material, and receiving electrode is separate, the emitting electrode width is C, length is L, 100mm〉C〉4mm, be shaped as circular or square, material is the metallic conduction material, emitting electrode links together, and consists of total emitting electrode of fixed polar plate, and total emitting electrode is connected capacitance measurement circuit with receiving electrode; The slip plate width is D, and length is A, D〉B, 2L〉A〉L, be shaped as circle or square, material is the metallic conduction material, and quantity is one, and the slip pole plate covers the sectional type conductive unit, and the slip pole plate connects the lining rope of dark basic point and shallow foundation point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320283968 CN203259106U (en) | 2013-05-23 | 2013-05-23 | Sectional mutual-capacitance displacement sensor for monitoring roof separation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320283968 CN203259106U (en) | 2013-05-23 | 2013-05-23 | Sectional mutual-capacitance displacement sensor for monitoring roof separation |
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| Publication Number | Publication Date |
|---|---|
| CN203259106U true CN203259106U (en) | 2013-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320283968 Withdrawn - After Issue CN203259106U (en) | 2013-05-23 | 2013-05-23 | Sectional mutual-capacitance displacement sensor for monitoring roof separation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103267474A (en) * | 2013-05-23 | 2013-08-28 | 山西煤炭运销集团有限公司 | Subsection mutual capacitance displacement sensor for monitoring top plate roof separation |
| CN107102782A (en) * | 2016-02-22 | 2017-08-29 | 台湾艾华电子工业股份有限公司 | Position sensor and its type variable capacitance component |
-
2013
- 2013-05-23 CN CN 201320283968 patent/CN203259106U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103267474A (en) * | 2013-05-23 | 2013-08-28 | 山西煤炭运销集团有限公司 | Subsection mutual capacitance displacement sensor for monitoring top plate roof separation |
| CN103267474B (en) * | 2013-05-23 | 2016-08-10 | 山西煤炭运销集团有限公司 | A kind of segmentation mutual capacitance type displacement transducer for roof delamination monitoring |
| CN107102782A (en) * | 2016-02-22 | 2017-08-29 | 台湾艾华电子工业股份有限公司 | Position sensor and its type variable capacitance component |
| CN107102782B (en) * | 2016-02-22 | 2023-03-14 | 台湾艾华电子工业股份有限公司 | Position sensor and variable capacitance component thereof |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20131030 Effective date of abandoning: 20160810 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |