CN2114139U - New-type capacity electronic level angle-measuring instrument - Google Patents
New-type capacity electronic level angle-measuring instrument Download PDFInfo
- Publication number
- CN2114139U CN2114139U CN 92214099 CN92214099U CN2114139U CN 2114139 U CN2114139 U CN 2114139U CN 92214099 CN92214099 CN 92214099 CN 92214099 U CN92214099 U CN 92214099U CN 2114139 U CN2114139 U CN 2114139U
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- CN
- China
- Prior art keywords
- converter
- moving plate
- stator
- housing
- rotating shaft
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- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The utility model relates to the novel capacity electronic level angle-measuring instrument comprising a capacitive sensor A, an a C-converter B, an amplifier C, an A/D converter D and a display device E, wherein, the capacitive sensor A adopts a rotor plate type capacitive sensor composed of a rotor plate, a stator plate, a rotating shaft and a casing; the relationship between the variable quantity of capacitance and the slope angle of the sensor is linear relationship. The utility model has the advantages of high precision, light weight, convenient carrying and low manufacture cost.
Description
The utility model belongs to the angle measuring instrument technical field.
Existing capacity-type electronic inclinometer adopts bubble formula capacitive transducer, as Chinese patent CN86202257.Bubble formula capacitive transducer is the sealed glass container of dress liquid medium in, and metal film is pasted in container outside, forms two arrays of electrodes, and the medium in every group of electrode and the container constitutes a group capacitor.Under horizontality, liquid medium amount contained between the pole plate of two capacitors equates that electric capacity equates.When the container lean certain angle, liquid position in the container changes, and liquid medium contained between capacitor plate is changed, thereby makes the electric capacity of two capacitors unequal, form a capacitance difference, this electric capacity extent promptly reflects the size at angle of inclination.By transducer, this capacitance difference is converted to electric signal, after amplifying, demonstrate angle value by display.Yet this inclinometer is difficult to accomplish accurate symmetry to the inwall size of glass container, and being in operation is difficult to reach high-precision requirement, and because dimensional requirement is tight, processing acquires a certain degree of difficulty, the cost height.
The purpose of this utility model is to provide a kind of electronics inclinometer that adopts moving plate formula capacitive transducer, to improve measuring accuracy.
The utility model comprises moving plate formula capacitive transducer A, C-V converter B, amplifier C, A/D converter D and display E five parts, and Fig. 1 is its circuit structure diagram.Moving plate formula capacitive transducer A is an airtight container, can adorn liquid medium in the container, also can adorn gas medium, comprises one group of moving plate 3, one group of stator 2, housing 1 and rotating shaft 4.Stator 2 is contained on the housing 1, moving plate 3 is contained in the rotating shaft 4, rotating shaft 4 is contained in the bearing of housing 1, can freely rotate, insulate with insulating material between stator 2 and the housing 1 and between moving plate 3 and the rotating shaft 4, moving plate 3 picks out to be connected with equipment circuit with stator 2 is all leaded, and housing is contained on the surveyor's staff of surveying instrument.Fig. 2, Fig. 3 are the structural drawing of capacitive transducer.In Fig. 2, can see that stator 2 is two semicircle pole plate 2a and 2b, moving plate 3 is one and half garden shape pole plates, they constitute two capacitor C
1And C
2Under horizontality, stator 2a and 2b topped moving plate area equate, be 1/4 of garden area, C
1And C
2Also equate.When sensor during with the surveyor's staff tilt angle theta, moving plate 3 is because the effect angle of gravity is constant, and stator 2 is cant angle theta angle thereupon then, then stator 2 the area of topped moving plate 3 change, thereby make C
1And C
2Also change.If the radius of moving plate 3 is R, the distance between moving plate 3 and the stator 2 is d, and dielectric constant is ε.Rotated at the stator 2 shown in Fig. 3 (b) under the situation at θ angle.
Stator 2a the area of topped moving plate 3 be reduced to:
S
1=1/4 π R
2-1/2RL(L is the arc length of the pairing moving plate in θ angle)
＝1／4·πR
2－1／360·πR
2θ＝1／360·πR
2（90－θ）
Corresponding therewith, C
1Electric capacity is reduced to C
1=1/360 π R
2(90-θ) ε/d=K(90-θ) (K is a constant, K=π R
2ε/360d) and stator 2d topped moving plate 3 areas increase C
2Electric capacity increases
C
2＝K（90＋θ）
This just is equivalent to C
1And C
2Form two variable capacitances, its equivalent electrical circuit is shown in Fig. 3 (c).Two electric capacitys poor
C
2－C
1＝△C＝K（90＋θ）－K（90－θ）＝2Kθ
This shows that the difference △ C of electric capacity and the pass between the tiltangle are linear relationship.Constant K and parameters R, ε, d are relevant, and these three parameters to be in operation be constant, so take measurement of an angle, can reach very high degree of accuracy with moving plate formula capacitive transducer.
C-V converter B can adopt pulse modulated circuit, comprises two operational amplifiers and two trigger flip-flop.An input end of two trigger flip-flop links with the output terminal of two operational amplifiers respectively, and another input end links to each other with the output terminal of another trigger flip-flop respectively.The output terminal of each trigger flip-flop all by one discharge and recharge resistance respectively with capacitive transducer A in C
1And C
2Be connected.After adding a benchmark turnover voltage, two trigger flip-flop just constantly trigger upset, thereby export a square-wave pulse, C in the width of square-wave pulse and resistance in the charge-discharge circuit and the capacitive transducer
1, C
2Size relevant.Work as C
1, C
2When changing, promptly changed the dutycycle of trigger flip-flop output square-wave pulse, thereby the effective value of pulse modulated circuit output voltage is changed with the pitch angle.
The voltage of C-V converter B output is transported to Displaying Meter after amplifier C amplifies, also can be converted to digital signal through A/D converter D, by numeric display unit E angles of display value.
C-V converter B also can be made of triode and resistance, electric capacity.
In C-V converter B, be provided with the zeroing capacitor C
0With the adjustment resistance R
0, the zeroing capacitor C
0With the C among the capacitive transducer A
1, C
2Resistance R is adjusted in parallel connection
0Can also can be connected between the output terminal of two trigger flip-flop with to discharge and recharge resistance in parallel.When surveyor's staff is placed under the horizontal level situation, use C
0And R
0The indication of instrument is adjusted to 0, and promptly the available water leveling ruler goes to measure the whether pitch angle between level or demonstration and the surface level of measured piece; Also can when measured piece is in unspecified angle, return to zero, measure and the formed angle of cut of this angle then.
The utility model has the advantages that the measuring accuracy height, and simple in structure, cost is low, is easy to carry, and is convenient to be installed on the measured piece.
Embodiment below in conjunction with shown in Figure 4 is further described the utility model:
C-V converter B adopts pulse modulated circuit, comprises two operational amplifier IC
3, IC
4, two trigger flip-flop IC
5, IC
6, reference voltage power supply, and R
8, W
3, D
1And R
9, W
4, D
2The charge-discharge circuit of forming.Operational amplifier IC is received in the output of reference voltage power supply
3And IC
4Input end, IC
3, IC
4Another input end and the C among the capacitive transducer A
1, C
2Be connected.Trigger flip-flop IC
5Input end and IC
3Output terminal link to each other another input end and IC
6Input end be connected, its output terminal is by charge-discharge circuit R
8, W
3, D
1With C
1Link.IC
6Input end and IC
4Output terminal link to each other another input end end and IC
5Output terminal be connected, its output terminal is by charging charge-discharge circuit R
9, W
4, D
2With C
2Be connected.With trigger flip-flop IC
5, IC
6Output terminal between voltage be the output voltage of C-V converter.The zeroing capacitor C
0With C
2Resistance R is adjusted in parallel connection
0Be connected between the output terminal of two trigger flip-flop.In order to guarantee that the pass between output voltage and the tested angle is a linear relationship, it is the mu balanced circuit of core that the reference voltage power supply adopts with accurate reference power supply, and output voltage is the 4-6 volt.From the signal voltage of C-V converter B output, after amplifier C amplification, D is converted to digital signal through A/D converter, exports digital indicator to and shows reading.A/D converter is the CMOS integrated circuit.Display E is a liquid crystal cell.Instrument uses the 9V battery.
Claims (4)
1, a kind of capacity-type electronic level angle instrument, by capacitive transducer A, C-V converter B, amplifier C, A/D converter D, display device E forms, it is characterized in that capacitive transducer A wherein is a moving plate formula sensor, by one group of moving plate 3, one group of stator 2, housing 1 and rotating shaft 4 are formed, stator 2 is contained on the housing 1, moving plate 3 is contained in the rotating shaft 4, rotating shaft 4 is contained on the housing, moving plate 3 is with insulating material and rotating shaft 4 insulation, and stator 2 maintains a certain distance between moving plate 3 and the stator 2 with insulating material and housing 1 insulation, constitute electric capacity, housing 1 is an airtight container, and the interior liquid medium of adorning also can be adorned gas medium.
2,, it is characterized in that the two ends of electric capacity in capacitive transducer A and hold a zeroing capacitor C according to the described electronic horizon inclinometer of claim 1
0
3,, it is characterized in that connecting one on two output terminals of C-V converter B adjusts resistance R according to the described electronic horizon inclinometer of claim 1
0
4,, it is characterized in that the adjustment resistance R in parallel on the resistance that discharges and recharges of C-V converter B according to the described electronic horizon inclinometer of claim 1
0
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92214099 CN2114139U (en) | 1992-01-17 | 1992-01-17 | New-type capacity electronic level angle-measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92214099 CN2114139U (en) | 1992-01-17 | 1992-01-17 | New-type capacity electronic level angle-measuring instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2114139U true CN2114139U (en) | 1992-08-26 |
Family
ID=4958706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92214099 Granted CN2114139U (en) | 1992-01-17 | 1992-01-17 | New-type capacity electronic level angle-measuring instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2114139U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101384881B (en) * | 2006-02-08 | 2011-07-06 | 莱卡地球***公开股份有限公司 | Angle measuring device |
| CN102778221A (en) * | 2011-05-09 | 2012-11-14 | 重庆师范大学 | Sensing method and apparatus for small inclination angle |
| CN103363888A (en) * | 2013-06-18 | 2013-10-23 | 浙江工业大学 | Capacitance sensor-based upper grinding disc floating distance on-line measuring device |
| CN104006737A (en) * | 2014-04-28 | 2014-08-27 | 哈尔滨工业大学 | Method and device for measuring dip angle of concentric coplanar ring, quartering ring and circle nested polar plate |
| CN105091734A (en) * | 2014-04-30 | 2015-11-25 | 鸿富锦精密工业(武汉)有限公司 | Displayer inclination angle indication system |
-
1992
- 1992-01-17 CN CN 92214099 patent/CN2114139U/en active Granted
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101384881B (en) * | 2006-02-08 | 2011-07-06 | 莱卡地球***公开股份有限公司 | Angle measuring device |
| CN102778221A (en) * | 2011-05-09 | 2012-11-14 | 重庆师范大学 | Sensing method and apparatus for small inclination angle |
| CN103363888A (en) * | 2013-06-18 | 2013-10-23 | 浙江工业大学 | Capacitance sensor-based upper grinding disc floating distance on-line measuring device |
| CN104006737A (en) * | 2014-04-28 | 2014-08-27 | 哈尔滨工业大学 | Method and device for measuring dip angle of concentric coplanar ring, quartering ring and circle nested polar plate |
| CN104006737B (en) * | 2014-04-28 | 2016-08-24 | 哈尔滨工业大学 | The nested pole plate inclination angle measurement method of concentric coplanar ring-quartering ring-circle and device |
| CN105091734A (en) * | 2014-04-30 | 2015-11-25 | 鸿富锦精密工业(武汉)有限公司 | Displayer inclination angle indication system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |