CN105823411B - A kind of curved surface profile measurement method - Google Patents
A kind of curved surface profile measurement method Download PDFInfo
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- CN105823411B CN105823411B CN201610154361.0A CN201610154361A CN105823411B CN 105823411 B CN105823411 B CN 105823411B CN 201610154361 A CN201610154361 A CN 201610154361A CN 105823411 B CN105823411 B CN 105823411B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/28—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring contours or curvatures
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- Length Measuring Devices With Unspecified Measuring Means (AREA)
Abstract
Present invention discloses a kind of curved surface profile measurement methods, including matrix circuit is attached on curved surface to be measured, by the distance between adjacent two electric field channels on detecting matrix circuit value, restore the position data of each electric field channel；The activation point for changing the matrix circuit along the surface direction perpendicular to the curved surface to be measured at least once, collects the position data of multiple groups electric field channel；According to the position data of the multiple groups electric field channel, the location status of each electric field channel is judged, and restore the shape of curved surface to be measured.The present invention compares traditional measurement of curved surface mode, has the advantages that measuring speed is fast, measurement accuracy is high, production cost is low etc..
Description
Technical field
The present invention relates to a kind of curved surface profile measurement technologies, more particularly, to a kind of fast, accurately curved surface profile measurement
Method.
Background technique
After over half a century, its appearance is the historical inevitability of industrialization development for the development of three coordinate measuring machine.One side
Face is since the development and the processing of more and more complicated shape parts of the processing of the high efficiency such as automatic machine tool, numerically-controlled machine tool need
Fast and reliable measuring device is matched；It on the other hand is due to electronic technology, computer technology, Numeric Control Technology and precision
The development of processing technology is provided for technical foundation.The appearance of three coordinate measuring machine so that measuring instrument from manual mode to existing
Generationization automatic measurement is transformed into possibility.
It is that will be measured to be compared the survey of coordinate measuring machine unlike measurement with mechanical references from traditional measurement instrument
Amount is actually based on the acquisition and calculating of spatial point coordinate.Although modern measuring machine is more advanced than the function of early stage very much,
But basic principle be it is identical, that is, build the structure of a rigidity, this structure is there are three mutually perpendicular axis, each axially mounted light
Grid ruler, and it is respectively defined as X, Y, Z axis.In order to which each axis can be moved, each axial direction is equipped with air bearing or mechanical bearing.
The position of detection system record measurement point any moment on the vertical axis.Detection system is usually by gauge head and contact type probe
It constitutes, the surface gentle touchdown of probe and measured workpiece obtains the coordinate of measurement point.In measurement process, coordinate measuring machine will
The measurement of the various geometric elements of workpiece is converted into the coordinate position put on these geometric elements, then by software according to corresponding geometry
The mathematical model of shape calculates the parameters such as the size, shape, relative position of these geometric elements.
By above-mentioned introduction it is found that the existing measurement to curved surface size, shape etc. depends on three coordinate measuring machine completion,
It is understood that the structure of existing three coordinate measuring machine is more complicated, production cost is relatively high, and due to its calculating process mainly according to
Rely and realized in software tool, therefore, there are also very big rooms for promotion on measuring speed and efficiency.It is therefore desirable to study one kind
Novel curved surface profile dimensional measurement mode, to improve, of the existing technology structure is complicated, at high cost, measuring speed is slow etc. asks
Topic.
Summary of the invention
It is an object of the invention to overcome the deficiencies of existing technologies, a kind of curved surface profile measurement method is provided, based on flexibility
Matrix circuit, and the activation point by changing matrix circuit on curved surface, to acquire the position of electric field channel on enough circuits
Data are set, quickly and accurately to measure curved surface profile size.
To achieve the above object, the following technical solutions are proposed: a kind of curved surface profile measurement method, including following step by the present invention
It is rapid:
Matrix circuit is attached on curved surface to be measured, by detecting matrix circuit between adjacent two electric field channels away from
From value, the position data of each electric field channel is restored；
The activation point for changing the matrix circuit along the surface direction perpendicular to the curved surface to be measured at least once, acquires
To the position data of multiple groups electric field channel；
According to the position data of the multiple groups electric field channel, the location status of each electric field channel is judged, and restore to be measured
The shape of curved surface.
Preferably, when matrix circuit being attached on curved surface to be measured, keep electric field channel parallel with curved surface to be measured.
Preferably, according to the position data of obtained multiple groups electric field channel, song to be measured is described in the form of function y=f (x)
Face radian changing rule, and with Fourier transformation, the track of the function is restored, the shape of curved surface to be measured can be restored.
Preferably, every to change the position for driving electric field channel in the primary matrix circuit, obtain one group of electric field channel
Position data, the position data of every group of electric field channel equally pass through on detecting matrix circuit between adjacent two electric field channels away from
It is restored from value.
Preferably, the calculating process of distance value includes: between adjacent two electric field channels on the matrix circuit
Adjacent two electric field channels are successively calculated in conjunction with capacity based distance measuring principle according to the coordinate of starting electric field channel
The distance between value.
Preferably, calculation formula used by the capacity based distance measuring principle are as follows: C=ε S/d, wherein C indicates electric field channel
Capacitor, ε are dielectric constant, and the field area that S is formed between adjacent two electric field channel, d is between adjacent two electric field channel
Distance.
Preferably, whether the location status for judging each electric field channel includes: to judge each electric field channel same
In plane.
Preferably, if △ d1=△ d2=0, judge adjacent three electric field channels in the same plane；If d1 ≠ 0 △
And/or d2 ≠ 0 △, then judge adjacent three electric field channels not in the same plane, wherein △ d1=D1-D, △ d2=D2-
D, △ d1, △ d2 are the changing value the distance between per two adjacent channels in adjacent three channels, and D1, D2 indicate adjacent two
Linear distance between electric field channel, D indicate the substrate distance between adjacent two electric field channels.
Preferably, the location status of each electric field channel of the judgement further include: according to the straight line between multiple electric field channels
Distance judges the arrangement trend direction of electric field channel.
Preferably, the matrix circuit includes flexible parent metal and more electric field channels being evenly distributed in flexible parent metal.
Preferably, every electric field channel is made of complex root flexible protective body and at least one conductor, the conductor with
The mode of braiding is evenly spaced in flexible protective body.
The beneficial effects of the present invention are:
1, the present invention is based on sensing circuits, by way of electric field induction, the position data of electric field channel in Acquisition Circuit,
And the activation point by changing sensing circuit on curved surface, enough data are collected, so as to obtain song more accurately
The true contours profiles in face.
2, the present invention compares traditional measurement of curved surface mode, has measuring speed is fast, measurement accuracy is high, production cost is low etc.
Advantage.
Detailed description of the invention
Fig. 1 is the flow diagram of curved surface profile measurement method of the present invention；
Fig. 2 is the structural schematic diagram of matrix circuit of the present invention；
Fig. 3 is the structural schematic diagram of arch object of the embodiment of the present invention；
Fig. 4 is schematic illustration of electric field of the embodiment of the present invention circuit on arch object；
Fig. 5 be the present invention judge each electric field channel whether schematic illustration in the same plane；
Fig. 6 is the schematic illustration in the arrangement trend direction that the present invention judges electric field channel.
Appended drawing reference:
1, flexible parent metal, 2, electric field channel.
Specific embodiment
Below in conjunction with attached drawing of the invention, clear, complete description is carried out to the technical solution of the embodiment of the present invention.
A kind of disclosed curved surface profile measurement method is based on flexible matrix circuit, successively on driving circuit
Circuit path, and the position data of circuit path is obtained by way of electric field induction, song is really restored according to these data
Face shape.
Carry out the principle of the present invention is described in detail curved surface profile measurement for measuring arch Irregular Boundary Surface below, certainly,
The present invention is not limited to measure arched surface, the curved surface present invention of other irregular shapes is equally applicable.
As shown in Figure 1, a kind of revealed curved surface profile measurement method of the embodiment of the present invention, comprising the following steps:
Step 1, matrix circuit is attached on curved surface to be measured, by detecting matrix circuit on adjacent two electric field channels it
Between distance value, restore each electric field channel position data.
As shown in Fig. 2, the matrix circuit in the present embodiment includes flexible parent metal 1 and more electricity being distributed in flexible parent metal
Channel 2, and the electric field channel in substrate be it is evenly distributed, spacing is equal, material is unified, size is the same, wherein every electricity
Field channel is made of complex root flexible protective body and at least one conductor, and conductor is evenly spaced in flexible guarantor in a manner of weaving
In watch box, it is preferable that every electric field channel in the present embodiment is in compression shape.Therefore the matrix circuit in the present embodiment is whole
It is flexibility, stretchable, can be attached on the curved surface of irregular shape.
Specifically, before matrix circuit is attached on curved surface to be measured, successively the electric field channel on driving circuit (C1,
C2 ... Cn), the distance between adjacent two electric field channels (C12, C23 ... Cn-1Cn) are obtained by way of electromagnetic induction
D1, D2 ... Dn-1, at this point, the distance between two neighboring electric field channel should be equal, i.e. D1=D2 ...=Dn-1
=D.Wherein, n is the integer greater than 2.Certainly, when it is implemented, here not necessarily limit take adjacent two electric field channels away from
From can also take three adjacent the distance between (i.e. channel C 1 and C3, channel C 4 and C6 ... channel C n-2 with Cn) or be connected
The distance between other number root channels.
The flexible parent metal of matrix circuit is seamless applying in arch body surface, and the shape of arch object as indicated at 3, is kept
Electric field channel is parallel with parallel arched surface, at this point, flexible parent metal only has deformation, does not stretch.At this point, logical according to starting electric field
The distance between adjacent two electric field channels value D1, D2 ... is successively calculated in conjunction with capacity based distance measuring principle in the coordinate in road
Dn-1 restores the position data of each electric field channel further according to these distance values.Specifically, the meter that capacity based distance measuring principle uses
Calculate formula are as follows: C=ε S/d, wherein C indicates electric field channel capacitor, and ε is dielectric constant, and S is formed between adjacent two electric field channel
Field area, d is the distance between adjacent two electric field channel.I.e. according to the coordinate (X1, Y1) of electric field channel C1, can be led to
The distance between road C1 and channel C 2 D12, are worth according to this distance, and the coordinate of electric field channel C2 can be obtained, and so on, finally may be used
Obtain the position data of all electric field channels.When electric field channel C1, C2 ..., Cn is in unified plane, and object under test surface is flat
Whole, i.e., C2 coordinate is (X1+D, Y1), and C3 coordinate is (X1+2D, Y1), and object under test length surface is N*D, individually to C1C3
Channel carries out electric field sensing, show that D13 distance is 2D distance.
In addition, by the distance between electric field channel value, where can determine whether electric field channel the case where body surface.With Fig. 4
In electric field channel C1, C2, C3 for, when these three channels are at the position of body surface one, there is D1=D2=D, illustrate electricity
Field channel C 1, C2, C3 are in same plane, and object under test surfacing；And these three channels are in the position of body surface two
When place, there is D1 < D, D2 < D at this time, illustrates to be bent to from C2, from channel C 2 to from C3 from channel C 1 at this time.
Step 2, at least once along the activation point of the surface direction change matrix circuit perpendicular to curved surface to be measured, collect
The position data of multiple groups electric field channel.
In view of step 1 acquire data it is limited, can't infinitely close to the exact shape data of object under test, therefore,
The present invention along perpendicular to curved surface to be measured surface direction change matrix circuit activation point at least once by way of, to adopt
Collect enough data.Every activation point for changing a matrix circuit, the position data of corresponding electric field channel is on circuit
It can change, also need that phase is successively calculated in conjunction with capacity based distance measuring principle by the coordinate for originating electric field channel at this time
The distance between adjacent two electric field channels value, restores to obtain the position data of each electric field channel.Specific calculating process is here
It repeats no more, can refer to the specific descriptions in step 1.
Step 3, according to the position data of multiple groups electric field channel, judge the location status of each electric field channel, and restore to
Survey the shape of curved surface.
Specifically, by the way that the position of electric field channel in matrix circuit is varied multiple times, so that it may obtain multiple groups electric field channel
Position data, according to these data, the present invention describes curved surface radian changing rule to be measured in the form of function y=f (x), is used in combination
Fourier transformation, goes back the track of original function, to obtain the true profile of arcuate surface to be measured.
It is further that, by the way that the activation point of matrix circuit is varied multiple times, can also judge each electric field channel
In the same plane whether location status, such as each electric field channel.Because of the relative position one of each electric field channel C1, C2 ... Cn
As can there are two types of may, one is (can be understood as Y direction) along longitudinal direction risings, and another kind is exactly to decline along longitudinal direction.
Specifically, judge each electric field channel whether condition in the same plane are as follows: if △ d1=△ d2=0, sentences
Adjacent three electric field channels break in the same plane；If d1 ≠ 0 △ and/or d2 ≠ 0 △, adjacent three electric field channels are judged
Not in the same plane, wherein △ d1=D1-D, △ d2=D2-D, △ d1, △ d2 are adjacent three channels per adjacent
The distance between two channels changing value, D1, D2 indicate the linear distance between adjacent two electric field channels, and D indicates adjacent two
Substrate distance between electric field channel.As shown in connection with fig. 5, between the channel C 1 in figure, channel C 2 and C3, △ d1=D1-D < 0 and
△ d2=D2-D < 0 then judges channel C 1, channel C 2 and C3 not in the same plane, channel C n-2, channel C n-1, channel C n
Between, △ dn-2=Dn-2-D=0, △ dn-1=Dn-1-D=0 then judges channel C n-2, channel C n-1, channel C n same
In plane.
Further, by the way that the position of electric field channel in matrix circuit is varied multiple times, and according between multiple electric field channels
Linear distance, also can determine whether the arrangement trend direction of electric field channel, be upward or downtrend along the y axis in this way.
Specifically, as shown in fig. 6, for four electric field channels C0, C1, C2 and C3 adjacent in scheme, such as to judge channel C 2 to logical
The trend direction of road C3, to originate channel C 0 as judgement basis, it is assumed that channel C 2 to channel C 3 is uptrend, then measures
It is L to channel C 3 to the linear distance of channel C 0；Assuming that channel C 2 is downtrend to channel C 3, then measurement obtains channel
The linear distance of C3 ' to channel C 0 is L ', because there is distance value L ' to be greater than distance value L certainly, is obtained by measurement straight
The size of linear distance judges the channel C 2 to the trend direction of channel C 3: if the linear distance value that measurement obtains is larger, for
Under trend；Conversely, being then uptrending.
Technology contents and technical characteristic of the invention have revealed that as above, however those skilled in the art still may base
Make various replacements and modification without departing substantially from spirit of that invention, therefore, the scope of the present invention in teachings of the present invention and announcement
It should be not limited to the revealed content of embodiment, and should include various without departing substantially from replacement and modification of the invention, and be this patent Shen
Please claim covered.
Claims (6)
1. a kind of curved surface profile measurement method, which comprises the following steps:
Matrix circuit is attached on curved surface to be measured, the distance between adjacent two electric field channels on detecting matrix circuit are passed through
Value restores the position data of each electric field channel；
The activation point for changing the matrix circuit along the surface direction perpendicular to the curved surface to be measured at least once, collects more
The position data of group electric field channel；
According to the position data of the multiple groups electric field channel, the location status of each electric field channel is judged, and restore curved surface to be measured
Shape；
The matrix circuit includes flexible parent metal and more electric field channels being evenly distributed in flexible parent metal, every electric field channel
It is made of complex root flexible protective body and at least one conductor, the conductor is evenly spaced in flexible protective in a manner of weaving
In body；
The calculating process of distance value includes: between adjacent two electric field channels on the matrix circuit
It is successively calculated between adjacent two electric field channels according to the coordinate of starting electric field channel in conjunction with capacity based distance measuring principle
Distance value；
The location status for judging each electric field channel includes: whether in the same plane to judge each electric field channel；If △
D1=△ d2=0 then judges adjacent three electric field channels in the same plane；If d1 ≠ 0 △ and/or d2 ≠ 0 △, judge
Not in the same plane, wherein △ d1=D1-D, △ d2=D2-D, △ d1, △ d2 are adjacent three to adjacent three electric field channels
A channel per the distance between two adjacent channels changing value, D1, D2 indicate the straight line between adjacent two electric field channels away from
From D indicates the substrate distance between adjacent two electric field channels.
2. measurement method according to claim 1, which is characterized in that when being attached to matrix circuit on curved surface to be measured, protect
It is parallel with curved surface to be measured to hold electric field channel.
3. measurement method according to claim 1, which is characterized in that according to the positional number of obtained multiple groups electric field channel
According to describing curved surface radian changing rule to be measured in the form of function y=f (x), and with Fourier transformation, restore the function
Track can restore the shape of curved surface to be measured.
4. measurement method according to claim 1, which is characterized in that every driving position for changing the primary matrix circuit
It sets, obtains the position data of one group of electric field channel, the position data of every group of electric field channel equally passes through phase on detecting matrix circuit
The value reduction of the distance between adjacent two electric field channels.
5. measurement method according to claim 1, which is characterized in that calculation formula used by the capacity based distance measuring principle
Are as follows: C=ε S/d, wherein C indicates electric field channel capacitor, and ε is dielectric constant, the electric field that S is formed between adjacent two electric field channel
Area, d are the distance between adjacent two electric field channel.
6. measurement method according to claim 1, which is characterized in that the location status of each electric field channel of the judgement is also
It include: the arrangement trend direction that electric field channel is judged according to the linear distance between multiple electric field channels.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610154361.0A CN105823411B (en) | 2016-03-18 | 2016-03-18 | A kind of curved surface profile measurement method |
| US15/458,076 US10408599B2 (en) | 2016-03-18 | 2017-03-14 | Sensing circuit, processing method of sensing circuit and curved surface profile measuring method thereof |
| JP2017052837A JP2017201507A (en) | 2016-03-18 | 2017-03-17 | Sensing circuit, method for processing sensing circuit, and method for measuring curved surface profile |
| JP2018005043U JP3221212U (en) | 2016-03-18 | 2018-12-26 | Sensing circuit, processing method of sensing circuit and curved surface contour measuring method |
| US16/257,072 US10948280B2 (en) | 2016-03-18 | 2019-01-25 | Sensing circuit, processing method of sensing circuit and curved surface profile measuring method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610154361.0A CN105823411B (en) | 2016-03-18 | 2016-03-18 | A kind of curved surface profile measurement method |
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| CN105823411A CN105823411A (en) | 2016-08-03 |
| CN105823411B true CN105823411B (en) | 2019-02-22 |
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| CN201610154361.0A Active CN105823411B (en) | 2016-03-18 | 2016-03-18 | A kind of curved surface profile measurement method |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3055698B1 (en) * | 2016-09-08 | 2018-08-17 | Safran Aircraft Engines | METHOD FOR CONTROLLING THE CONFORMITY OF THE PROFILE OF A CURVED SURFACE OF AN ELEMENT OF A TURBOMACHINE |
| CN108195336B (en) * | 2017-12-26 | 2020-10-09 | 深圳市宇恒互动科技开发有限公司 | Method, device and system for sensing three-dimensional shape of object |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1321243A (en) * | 1999-07-09 | 2001-11-07 | 株式会社东金 | Capacitive deformation sensor and method of using the same |
| US6402195B1 (en) * | 1999-04-14 | 2002-06-11 | Bayerische Motoren Werke Aktiengesellschaft | Device for adjusting a vehicle head support and a method using such a device |
| CN1882280A (en) * | 2003-05-19 | 2006-12-20 | 智能生活技术有限公司 | Knitted transducer devices |
| CN102203547A (en) * | 2008-10-31 | 2011-09-28 | 株式会社藤仓 | Capacitance-type sensor |
| CN105283122A (en) * | 2012-03-30 | 2016-01-27 | 伊利诺伊大学评议会 | Appendage mountable electronic devices conformable to surfaces |
-
2016
- 2016-03-18 CN CN201610154361.0A patent/CN105823411B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6402195B1 (en) * | 1999-04-14 | 2002-06-11 | Bayerische Motoren Werke Aktiengesellschaft | Device for adjusting a vehicle head support and a method using such a device |
| CN1321243A (en) * | 1999-07-09 | 2001-11-07 | 株式会社东金 | Capacitive deformation sensor and method of using the same |
| CN1882280A (en) * | 2003-05-19 | 2006-12-20 | 智能生活技术有限公司 | Knitted transducer devices |
| CN102203547A (en) * | 2008-10-31 | 2011-09-28 | 株式会社藤仓 | Capacitance-type sensor |
| CN105283122A (en) * | 2012-03-30 | 2016-01-27 | 伊利诺伊大学评议会 | Appendage mountable electronic devices conformable to surfaces |
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