CN110470276A - A kind of angle measurement unit and its application method - Google Patents
A kind of angle measurement unit and its application method Download PDFInfo
- Publication number
- CN110470276A CN110470276A CN201810435773.0A CN201810435773A CN110470276A CN 110470276 A CN110470276 A CN 110470276A CN 201810435773 A CN201810435773 A CN 201810435773A CN 110470276 A CN110470276 A CN 110470276A
- Authority
- CN
- China
- Prior art keywords
- resistance wire
- measuring electrode
- shell
- outer ring
- inner ring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C9/00—Measuring inclination, e.g. by clinometers, by levels
- G01C9/10—Measuring inclination, e.g. by clinometers, by levels by using rolling bodies, e.g. spheres, cylinders, mercury droplets
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C9/00—Measuring inclination, e.g. by clinometers, by levels
- G01C9/10—Measuring inclination, e.g. by clinometers, by levels by using rolling bodies, e.g. spheres, cylinders, mercury droplets
- G01C2009/107—Measuring inclination, e.g. by clinometers, by levels by using rolling bodies, e.g. spheres, cylinders, mercury droplets spheres
Abstract
The present invention provides a kind of angle measurement unit and its application methods, belong to the sensor technical field of angle measurement.The angle measurement unit includes shell, resistance wire, conductive survey pearl and measuring electrode；The shell is hollow circular ring structure；The conductive survey pearl is placed in the cavity of the shell, and can freely roll along the circumferencial direction of shell in the cavities；The resistance wire is arranged in the cavity, and is fixed on the inner wall of the shell；One end of the measuring electrode is connect with resistance wire, and the other end reaches the outside of the shell.The angle between testee and plumb line can be accurately determined the present invention is based on gravity principle and Ohm's law, and the configuration of the present invention is simple, easy for installation, high reliablity, low in cost, can be suitably used for the adverse circumstances of high temperature and humidity.
Description
Technical field
The invention belongs to the sensor technical fields of angle measurement, and in particular to a kind of angle measurement unit, for measuring
Angle between the reference line and vertical guide of testee.
Background technique
It needs to be determined that angle between testee and plumb line in many fields, for feelings that directly can be visual
Condition, using common angle measurement unit, but in the case of can not be directly visual, such as the object in drilling well blind hole
Body, the measurement to its angle are very difficult.
Moreover, it is existing for measuring the device such as obliquity sensor of angle etc. between object and vertical guide, usually adopt
With principles such as inductance type, condenser type, photo-electric, raster pattern, acceleration transducers, although these sensor accuracies are higher,
Processing is complicated, and higher cost is not suitable for the severe working environment such as high temperature and humidity.
Summary of the invention
It is an object of the invention to solve above-mentioned problem existing in the prior art, provide a kind of angle measurement unit and its
Application method is capable of the variation of the angle of precise measurement testee, and structure is simple, easy for installation, high reliablity, at low cost
It is honest and clean, it can be suitably used for the adverse circumstances of high temperature and humidity.
The present invention is achieved by the following technical solutions:
A kind of angle measurement unit, including shell, resistance wire, conductive survey pearl and measuring electrode；
The shell is hollow circular ring structure；
The conductive survey pearl is placed in the cavity of the shell, and can be free along the circumferencial direction of shell in the cavities
It rolls；
The resistance wire is arranged in the cavity, and is fixed on the inner wall of the shell；
One end of the measuring electrode is connect with resistance wire, and the other end reaches the outside of the shell.
The resistance wire includes inner ring resistance wire and outer ring resistance wire；
The inner ring resistance wire and outer ring resistance wire are inc circular ring shape, and one end is starting point, and the other end is end
Tail end；
The inner ring resistance wire and outer ring resistance wire are coaxially arranged in parallel, axis, the outer loop resistance of the inner ring resistance wire
The central axis of the axis and the shell of silk is located on the same line.
The shape of the cross section of the shell is circular ring shape；
The conductive survey pearl is spheroidal；
The conductive survey pearl contacts simultaneously with inner ring resistance wire and outer ring resistance wire.
The starting point and end in gap, the inner ring resistance wire between the starting point and end end of the outer ring resistance wire
Gap between end is 0.5-1 millimeters.
Preferably, the starting point of the inner ring resistance wire and outer ring resistance wire, the setting of end end are as follows: conduction surveys pearl can be with
The starting point of inner ring resistance wire, the starting point of outer ring resistance wire contact simultaneously, at this time the conductive end for surveying pearl and inner ring resistance wire
End and the end end of outer ring resistance wire do not contact.
The measuring electrode includes outer ring measuring electrode and inner ring measuring electrode；
One end of the outer ring measuring electrode is connect with the starting point of outer ring resistance wire, one end of the inner ring measuring electrode
It is connect with the starting point of inner ring resistance wire；
The other end of the outer ring measuring electrode, the other end of inner ring measuring electrode reach the outer of the shell respectively
Portion.
Described device further comprises the constant-current source circuit and A/D conversion circuit that hull outside is arranged in；
The constant-current source circuit is connect with outer ring measuring electrode and inner ring measuring electrode, constant for providing to measuring electrode
Electric current；
The A/D conversion circuit is connect with outer ring measuring electrode and inner ring measuring electrode, for measuring outer ring measuring electrode
Voltage between inner ring measuring electrode.
The resistance wire uses Precision resistance wire；
The shell is made of non-conducting material；
The conductive survey pearl is made of conductive material；
The angle measurement unit is fabricated using MEMS processing technology.
The application method of the angle measurement unit is as follows:
(1) angle measurement unit is fixedly connected with testee, and makes the central axis and level of the shell
Line is parallel, and conduction surveys pearl and rests on the position contacted simultaneously with the starting point of the starting point of inner ring resistance wire, outer ring resistance wire, this
When testee reference line and plumb line between angle be 0 degree；
(2) to the electric current I of measuring electrode input constant size, at the same measure outer ring measuring electrode and inner ring measuring electrode it
Between voltage U；
(3) quilt is obtained using the voltage U between step (2) obtained outer ring measuring electrode of measurement and inner ring measuring electrode
Survey the angle n between object and plumb line.
The operation of the step (3) includes:
Using following formula according to the voltage between step (2) the outer ring measuring electrode measured and inner ring measuring electrode
The angle n between the reference line of testee and plumb line is calculated in U:
Wherein, S is the cross-sectional area of resistance wire；
R3For the conductive resistance for surveying pearl；
ρ is the resistance of resistance wire；
r1For the radius of inner ring resistance wire；
r2For the radius of outer ring resistance wire.
Compared with prior art, the beneficial effects of the present invention are:
(1) the present invention is based on gravity principle and Ohm's law can accurately determine testee reference line and plumb line it
Between angle；
(2) the configuration of the present invention is simple, easy for installation, high reliablity, it is low in cost, it can be suitably used for the severe ring of high temperature and humidity
Border；
(3) volume of device can be made to be obviously reduced using MEMS processing technology manufacture angle measurement unit, reduced into
This, and expand use scope.
Detailed description of the invention
The structural schematic diagram of Fig. 1 angle measurement unit of the present invention.
Specific embodiment
Present invention is further described in detail with reference to the accompanying drawing:
As shown in Figure 1, angle measurement unit of the present invention be hollow structure, including shell 1 (being made of non-conducting material),
Resistance wire (using Precision resistance wire), conductive survey pearl 6 and measuring electrode, the shell 1 are preferably hollow ring structure, in this way
Can ensure that it is conductive survey pearl 6 and can freely be rolled in ring, when stationary state, can be parked in the bottom of ring, such measurement direction ability always
Accurately.
On the inner wall of shell 1, it is provided with two resistance wires.Side is peripherally disposed on inner wall outer ring
Resistance wire 2, the other side on inner wall is peripherally disposed an inner ring resistance wire 3, and the two, which is coaxially arranged in parallel, (both i.e. to exist
Any position does not contact), the central axis position of the axis of the inner ring resistance wire, the axis of outer ring resistance wire and the shell
In on same straight line, the axis of resistance wire refers to the straight line where the center of circle after resistance wire surrounds circular ring shape, the straight line and electricity
Plane where hindering silk is vertical, and the central axis refers to the straight line where the center of circle of shell, flat where the straight line and shell
Face is vertical.Because the cross section of shell is circular ring shape, it is spherical shape that conduction, which surveys pearl, and conduction is surveyed pearl and can be contacted with the inner wall of shell
It arrives, so having certain angle between two resistance wires from the point of view of the cross section of shell, being separated by 180 both in the present embodiment
Degree, the center of circle of the two is respectively positioned on the center point of shell at this time.In actual use, resistance wire can be bonded in the inner wall of shell
On, other integrated techniques can also be used, if resistance wire can be fixed, and enable it is conductive survey pearl smoothly in shell
It is rolled in cavity.
Every resistance wire is inc circle, and starting point and end end are in close proximity (in the present embodiment, as schemed
Shown in 1, when the starting point of two resistance wires is respectively positioned on plumb line and the conductive bottom surveyed pearl and be still in the plumb line direction of shell
When portion, conduction surveys pearl and just contacts and be formed into a loop with the starting point of two resistance wires, but conductive pearl and two resistance wires surveyed
End end does not contact.For example, the distance between starting point and end end can be 0.5 millimeter or 1 millimeter), outer loop resistance
The starting point of silk 2 is connect with outer ring measuring electrode 5, and the starting point of inner ring resistance wire 3 is connect with inner ring measuring electrode 4, two surveys
Measuring electrode can be located at the same position of measurement ring wall, and conductive survey pearl can connect two measuring electrodes simultaneously at this time, outer at this time
Resistance between ring measuring electrode 5 and conductive survey pearl 6, between inner ring measuring electrode 4 and conductive survey pearl 6 is 0；Two measuring electrodes
Can also be located at the different location of measurement ring wall, it is conductive at this time to survey pearl and when some measuring electrode contacts, the measuring electrode with
The resistance value of resistance wire between another measuring electrode is not 0, but the resistance value can be recorded, in subsequent meter
The resistance value is subtracted during calculating.
The conductive survey pearl 6 is placed in the inside of the shell, and can freely roll and contact with two resistance wires,
When the conductive survey pearl 6 rolls in the shell, due to gravity, the bottom of the shell is eventually stopped at.By
Resistance between the conductive electric action for surveying pearl 6, two measuring electrodes is changed with the conductive rotation for surveying pearl 6
's.
The angle measurement unit is manufactured using MEMS processing technology.
Described device further comprises that the constant-current source circuit that hull outside is arranged in and A/D conversion circuit (use existing electricity
Road is not shown in Fig. 1)；The constant-current source circuit is connect with two measuring electrodes, for providing perseverance for angle measurement ring
Fixed electric current；The A/D conversion circuit is connect with two measuring electrodes, for measuring the voltage between two measuring electrodes.
In actual use, it can according to need and angle measurement unit be fixed on testee using various ways, example
Two such as can be done on the outer wall of shell and opens foraminate boss, and threaded hole is set on testee accordingly, uses screw
Angle measurement unit is screwed on testee, or directly angle measurement unit is adhered on testee；If tested
Object is cylindrical shell structure, can also mill out annular groove on the inner wall of cylindrical shell, angle measurement unit is fixed with glue
On the inner wall of cylindrical shell.
The application method of the angle measurement unit is as follows:
(1) angle measurement unit is fixedly connected with testee, and makes the central axis and level of the shell
Line is parallel, and conduction surveys pearl and rests on the position contacted simultaneously with the starting point of the starting point of inner ring resistance wire, outer ring resistance wire, this
When testee reference line and plumb line between angle be 0 degree；
(2) it when the angle of testee changes, to the electric current I of measuring electrode input constant size, measures simultaneously
Voltage U between outer ring measuring electrode and inner ring measuring electrode；
(3) after obtaining voltage U using apparatus of the present invention, by calculating between the reference line and plumb line that obtain testee
Angle n:
From Ohm's law:
U=I × R
Wherein:
U is the voltage between two measuring electrodes, and I is the constant current applied, and R is equivalent between two measuring electrodes
Resistance.
By the structure of angle measurement unit it is found that the equivalent resistance R between two measuring electrodes is by inner ring resistance wire resistance
R1, outer ring resistance wire resistance R2Bead resistance R is surveyed with conduction3Composition.That is:
R=R1+R2+R3
Inner ring resistance wire resistance R1It may be expressed as:
Wherein, ρ is resistance wire resistance, L1For the conductive arc length surveyed between pearl and inner ring measuring electrode；S is the cross of resistance wire
Sectional area.
Outer ring resistance wire resistance R2It may be expressed as:
Wherein, ρ is resistance wire resistance, L2For the conductive arc length surveyed between pearl and outer ring measuring electrode；S is the cross of resistance wire
Sectional area.
Arc length may be expressed as:
Wherein:
N is central angle degree, i.e. angle between the reference line and plumb line of testee；R is radius.
It can thus be appreciated that:
Wherein:
L1For the conductive arc length surveyed between pearl and inner ring measuring electrode；r1For the radius of inner ring resistance wire；L2Pearl is surveyed for conduction
With the arc length between outer ring measuring electrode；r2For the radius of outer ring resistance wire.
It can thus be concluded that going out:
The angle between the reference line of testee and plumb line can be acquired are as follows:
Wherein I, ρ, π, S, R3、r1、r2It is known quantity.
The angle between the reference line of testee and plumb line can be accurately measured using the present invention, and can be in real time
The variation of angle is obtained, measurement accuracy is high and is suitable for a variety of environment.
Above-mentioned technical proposal is one embodiment of the present invention, for those skilled in the art, at this
On the basis of disclosure of the invention application method and principle, it is easy to make various types of improvement or deformation, be not limited solely to this
Invent method described in above-mentioned specific embodiment, therefore previously described mode is only preferred, and and do not have limitation
The meaning of property.
Claims (10)
1. a kind of angle measurement unit, it is characterised in that: the angle measurement unit include shell, resistance wire, it is conductive survey pearl and
Measuring electrode；
The shell is hollow circular ring structure；
The conductive survey pearl is placed in the cavity of the shell, and can freely roll along the circumferencial direction of shell in the cavities
It is dynamic；
The resistance wire is arranged in the cavity, and is fixed on the inner wall of the shell；
One end of the measuring electrode is connect with resistance wire, and the other end reaches the outside of the shell.
2. angle measurement unit according to claim 1, it is characterised in that: the resistance wire includes inner ring resistance wire and outer
Loop resistance silk；
The inner ring resistance wire and outer ring resistance wire are inc circular ring shape, and one end is starting point, and the other end is end end；
The inner ring resistance wire and outer ring resistance wire are coaxially arranged in parallel, the axis of the inner ring resistance wire, outer ring resistance wire
The central axis of axis and the shell is located on the same line.
3. angle measurement unit according to claim 2, it is characterised in that: the shape of the cross section of the shell is annulus
Shape；
The conductive survey pearl is spheroidal；
The conductive survey pearl contacts simultaneously with inner ring resistance wire and outer ring resistance wire.
4. angle measurement unit according to claim 3, it is characterised in that: the starting point and end of the outer ring resistance wire
Gap between end, the gap between the starting point and end end of the inner ring resistance wire are 0.5-1 millimeters.
5. angle measurement unit according to claim 4, it is characterised in that: the inner ring resistance wire and outer ring resistance wire
Starting point, the setting of end end are as follows: conduction is surveyed pearl and can be connect simultaneously with the starting point of inner ring resistance wire, the starting point of outer ring resistance wire
Touching, conductive survey pearl does not contact with the end end of inner ring resistance wire and the end end of outer ring resistance wire at this time.
6. angle measurement unit according to claim 5, it is characterised in that: the measuring electrode includes outer ring measuring electrode
With inner ring measuring electrode；
One end of the outer ring measuring electrode is connect with the starting point of outer ring resistance wire, one end of the inner ring measuring electrode with it is interior
The starting point of loop resistance silk connects；
The other end of the outer ring measuring electrode, the other end of inner ring measuring electrode reach the outside of the shell respectively.
7. angle measurement unit according to claim 6, it is characterised in that: described device further comprises being arranged in shell
External constant-current source circuit and A/D conversion circuit；
The constant-current source circuit is connect with outer ring measuring electrode and inner ring measuring electrode, for providing constant electricity to measuring electrode
Stream；
The A/D conversion circuit is connect with outer ring measuring electrode and inner ring measuring electrode, for measuring outer ring measuring electrode and interior
Voltage between ring measuring electrode.
8. angle measurement unit according to claim 7, it is characterised in that: the resistance wire uses Precision resistance wire；
The shell is made of non-conducting material；
The conductive survey pearl is made of conductive material；
The angle measurement unit is fabricated using MEMS processing technology.
9. a kind of application method of any angle measurement unit of claim 1-8, it is characterised in that: the method packet
It includes:
(1) angle measurement unit is fixedly connected with testee, and keeps the central axis of the shell and horizontal line flat
Row, conduction survey pearl rest on the position contacted simultaneously with the starting point of the starting point of inner ring resistance wire, outer ring resistance wire, at this time by
The angle surveyed between the reference line and plumb line of object is 0 degree；
(2) it to the electric current I of measuring electrode input constant size, while measuring between outer ring measuring electrode and inner ring measuring electrode
Voltage U；
(3) testee is obtained using the voltage U between step (2) obtained outer ring measuring electrode of measurement and inner ring measuring electrode
Reference line and plumb line between angle n.
10. according to the method described in claim 9, it is characterized by: the described method includes: the operation of the step (3) includes:
It is counted using following formula according to the voltage U between step (2) the outer ring measuring electrode measured and inner ring measuring electrode
Calculation obtains the angle n between the reference line of testee and plumb line:
Wherein, S is the cross-sectional area of resistance wire；
R3For the conductive resistance for surveying pearl；
ρ is the resistance of resistance wire；
r1For the radius of inner ring resistance wire；
r2For the radius of outer ring resistance wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810435773.0A CN110470276A (en) | 2018-05-09 | 2018-05-09 | A kind of angle measurement unit and its application method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810435773.0A CN110470276A (en) | 2018-05-09 | 2018-05-09 | A kind of angle measurement unit and its application method |
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| Publication Number | Publication Date |
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| CN110470276A true CN110470276A (en) | 2019-11-19 |
Family
ID=68503319
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|---|---|---|---|
| CN201810435773.0A Pending CN110470276A (en) | 2018-05-09 | 2018-05-09 | A kind of angle measurement unit and its application method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111238436A (en) * | 2020-03-19 | 2020-06-05 | 国网河南省电力公司电力科学研究院 | Device for measuring rotation angle, apparatus and method of use thereof |
| CN113375640A (en) * | 2021-07-14 | 2021-09-10 | 国家电网有限公司 | Supplementary leveling instrument is used in going up and down in coordination |
| CN114431557A (en) * | 2022-01-11 | 2022-05-06 | 深圳市多米诺时代科技有限公司 | Intelligent wearable device |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103175989A (en) * | 2013-03-12 | 2013-06-26 | 西华师范大学 | Three-dimensional direction test device |
| CN204514317U (en) * | 2015-03-31 | 2015-07-29 | 西安理工大学 | A kind of novel Horizontal angle rule |
| CN204963856U (en) * | 2015-10-13 | 2016-01-13 | 黄强强 | Mercury dip meter |
| CN106123854A (en) * | 2016-06-30 | 2016-11-16 | 窦磊 | Rifle face tilts firing angle directive correction corrector |
| CN106379086A (en) * | 2016-11-24 | 2017-02-08 | 刘颖 | Geometric figure drawing tool for teaching |
| CN106494133A (en) * | 2016-11-24 | 2017-03-15 | 刘颖 | A kind of engineer's scale |
| CN107655456A (en) * | 2017-10-16 | 2018-02-02 | 广州市建设工程质量安全检测中心 | A kind of high-precision pendulum resistance-type inclination measurement device for being used to monitor and method |
| CN208238783U (en) * | 2018-05-09 | 2018-12-14 | 中国科学院地理科学与资源研究所 | A kind of angle measurement unit |
-
2018
- 2018-05-09 CN CN201810435773.0A patent/CN110470276A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103175989A (en) * | 2013-03-12 | 2013-06-26 | 西华师范大学 | Three-dimensional direction test device |
| CN204514317U (en) * | 2015-03-31 | 2015-07-29 | 西安理工大学 | A kind of novel Horizontal angle rule |
| CN204963856U (en) * | 2015-10-13 | 2016-01-13 | 黄强强 | Mercury dip meter |
| CN106123854A (en) * | 2016-06-30 | 2016-11-16 | 窦磊 | Rifle face tilts firing angle directive correction corrector |
| CN106379086A (en) * | 2016-11-24 | 2017-02-08 | 刘颖 | Geometric figure drawing tool for teaching |
| CN106494133A (en) * | 2016-11-24 | 2017-03-15 | 刘颖 | A kind of engineer's scale |
| CN107655456A (en) * | 2017-10-16 | 2018-02-02 | 广州市建设工程质量安全检测中心 | A kind of high-precision pendulum resistance-type inclination measurement device for being used to monitor and method |
| CN208238783U (en) * | 2018-05-09 | 2018-12-14 | 中国科学院地理科学与资源研究所 | A kind of angle measurement unit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111238436A (en) * | 2020-03-19 | 2020-06-05 | 国网河南省电力公司电力科学研究院 | Device for measuring rotation angle, apparatus and method of use thereof |
| CN113375640A (en) * | 2021-07-14 | 2021-09-10 | 国家电网有限公司 | Supplementary leveling instrument is used in going up and down in coordination |
| CN114431557A (en) * | 2022-01-11 | 2022-05-06 | 深圳市多米诺时代科技有限公司 | Intelligent wearable device |
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