CN209214550U - A kind of device for contactless Calibration - Google Patents
A kind of device for contactless Calibration Download PDFInfo
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- CN209214550U CN209214550U CN201920161204.1U CN201920161204U CN209214550U CN 209214550 U CN209214550 U CN 209214550U CN 201920161204 U CN201920161204 U CN 201920161204U CN 209214550 U CN209214550 U CN 209214550U
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- tubing
- screen
- pair
- measurement
- shaped rest
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- Length Measuring Devices By Optical Means (AREA)
Abstract
The utility model discloses a kind of devices for contactless Calibration, belong to digital image processing field, by collimated light source, as screen, for placing a pair of of V-shaped rest, the ccd image acquisition system composition of tubing to be measured, tested circular pipe is projected in as being projected on as screen on screen using ccd image acquisition system acquisition tubing using collimated light.It is to be provided with upper and lower two standard cylinders with other computer vision dimensional measurement differences, standard cylinder has similar projecting gray scale images to tubing coboundary, improves measurement accuracy using standard cylinder as measurement benchmark；V-shaped rest improves the positioning accuracy of tubing to be measured, detects quickly, in high precision especially suitable for pipe diameter on assembly line；Measurement process tubing is not necessarily to stress, applies also for flexible material tubing diameter measurement.
Description
Technical field
The utility model category is based particularly on what is involved is industrial flow-line pipe diameter contactless high-precision measuring device
The similar caliber high-precision automatic measuring device of digital image processing techniques.
Background technique
Various material tubing have a wide range of applications in terms of daily production and life, and tradition is to pipe diameter high-precision
Detection method is measured by hand using tools such as slide calliper rule or micrometers, and this to complete measurement by manpower, it is slow that there are speed,
Large labor intensity, the low many deficiencies of sampling observation rate.In addition, utilizing vernier caliper if itself material of tubing to be measured is more easily-deformable
Equal contact methods measurement, often measurement error is larger.
Measured using optical means have many advantages, such as it is at low cost, high speed, it is non-contact.Traditional computer image processing method
Formula measure its image measurement precision be pixel magnitude, measurement accuracy more demanding occasion smaller for assembly line caliber deviation,
Meet demand is tended not to, introducing digital speckle related algorithm can be improved image measurement precision to 0.01 pixel, greatly improve
Dimensional measurement precision.In addition it not will lead to stress deformation in measurement process using non-contact measurement method to generate measurement result
It influences.
Utility model content
The utility model is to overcome existing non-contact measurement precision not high and tubing placement location to be measured inaccuracy
Technical problem provides a kind of device for contactless Calibration, successively includes: directional light along the light direction of propagation
Colimated light system, as screen, telecentric imaging camera lens, ccd image acquisition system；The directional light optical axis that directional light colimated light system issues is water
Square to, directional light colimated light system and as screen between vertical optical axis horizontal direction on be additionally provided with a pair of of V-shaped rest；It is described
V-shaped groove bottom line is horizontally and perpendicularly to optical axis on a pair of of V-shaped rest；Two and V-arrangement are additionally provided on a pair of of V-shaped rest
The parallel standard cylinder of slot bottom line, two standard cylinders are individually fixed in the surface and just of the pair of V-shaped rest
Lower section；Under the directional light vertical incidence of directional light colimated light system outgoing is to the surface for being fixed on the pair of V-shaped rest and just
The picture of two standard cylinders is projected in as on screen, the telecentric imaging camera lens is used by two standard cylinders of side in real time
In will as screen on projection image be presented in ccd image acquisition system.The telecentric imaging camera lens guarantees object plane different location
Corresponding image amplification factor is consistent.
The working principle of above-mentioned apparatus are as follows: tested circular pipe is projected in as utilizing ccd image on screen using collimated light
Acquisition system acquires tubing and projects on as screen, is that the utility model is provided with up and down with other computer vision dimensional measurement differences
Two standard cylinders；Standard cylinder projected boundary and tubing to be measured have similar projected boundary, therefore can pass through upper and lower two
Root just director circle column as measurement benchmark.And due to placing tubing to be measured, the slot of V-shaped rest using a pair of of V-shaped rest
Baseline is parallel with tubing to be measured, therefore positioning accuracy can be improved.Above-mentioned apparatus is fast especially suitable for pipe diameter on assembly line
Speed, high-precision detect；Measurement process tubing is not necessarily to stress, applies also for flexible material tubing diameter measurement.
To sum up, acquired digital picture is that standard cylindrical edge and tested caliber project in the technical program, due to standard
Cylinder boundary has a similar projection gray level pattern to caliber boundary, therefore can guarantee related operation measurement accuracy, in addition, logical
Parallel light projection straight edge diffraction can be eliminated to measurement result influence to bound operation by crossing two.
Detailed description of the invention
Fig. 1: for the schematic device for contactless Calibration；
Wherein: 1- directional light colimated light system, 2- standard cylinder, 3-V shape bracket, 4- picture screen, 5- telecentric imaging objective, 6-
Ccd image acquisition device.
Fig. 2: for the device operation principle schematic diagram for contactless Calibration.
Specific embodiment
The utility model is further described with reference to the accompanying drawings and embodiments:
Embodiment:
A kind of device for contactless Calibration, as shown in Figure 1, successively including: flat along the light direction of propagation
Row light colimated light system 1, as shield 4, telecentric imaging camera lens 5, ccd image acquisition system 6；The directional light that directional light colimated light system issues
Optical axis is horizontal direction, in directional light colimated light system and as being additionally provided with a pair of of V-arrangement in the horizontal direction of vertical optical axis between screen
Bracket 3；V-shaped groove bottom line is horizontally and perpendicularly to optical axis on the pair of V-shaped rest；It is also set up on a pair of of V-shaped rest
There are two standard cylinders 2 parallel with V-shaped groove bottom line, two standard cylinders are individually fixed in the pair of V-shaped rest
Surface and underface；The directional light vertical incidence of directional light colimated light system outgoing is to being fixed on the pair of V-shaped rest
The picture of two standard cylinders is projected on as shielding by two standard cylinders of surface and underface in real time, described remote
Heart imaging lens are used for will be as the projection image on screen is presented in ccd image acquisition system.
As shown in Fig. 2, the pixel distance d ' at the projected boundary similar to tubing to be measured of subscript modified cylindrical projection boundary1, under
Pixel distance d ' at square standard cylinder projected boundary projected boundary similar to tubing to be measured2, ccd image acquisition system times magnification
Number is K, and the boundary pixel distance of two standard cylinders is D, then tubing actual diameter to be measured, d '=K (d '1+d′2)-D。
The pipe diameter measuring device is not suitable for batch pipe diameter measurement on assembly line, since measurement pipe diameter is similar,
Generally more demanding to measurement accuracy, common computer visual processing method cannot achieve sub-pixel measurement, by introducing up and down
There is the standard cylinder boundary of similar projection gray level to tubing boundary, digital speckle related algorithm can be introduced and realize sub-pix essence
The displacement meter for spending rank is calculated, to realize the high-acruracy survey to pipe diameter, can carry out diameter survey to same root tubing multiple spot
Amount.Substantially increase the precision of pipe diameter automatic measurement；It is quick, high-precision that this method is suitable for pipe diameter batch on assembly line
Degree detection；Measurement process tubing is not necessarily to stress, applies also for flexible material tubing diameter measurement.
The technical program unspecified part belongs to technology well known to those skilled in the art.
Claims (2)
1. a kind of device for contactless Calibration, it is characterised in that along the light direction of propagation successively include: parallel
Light colimated light system, as screen, telecentric imaging camera lens, ccd image acquisition system；Directional light colimated light system issue directional light optical axis be
Horizontal direction, in directional light colimated light system and as being additionally provided with a pair of of V-shaped rest in the horizontal direction of vertical optical axis between screen；Institute
It states V-shaped groove bottom line on a pair of of V-shaped rest and is horizontally and perpendicularly to optical axis；Two and V are additionally provided on a pair of of V-shaped rest
The parallel standard cylinder of shape slot bottom line, two standard cylinders be individually fixed in the pair of V-shaped rest surface and
Underface；The directional light vertical incidence of directional light colimated light system outgoing is to the surface for being fixed on the pair of V-shaped rest and just
The picture of two standard cylinders is projected in as on screen, the telecentric imaging camera lens is used for will by two standard cylinders of lower section
As the projection image on screen is presented in ccd image acquisition system.
2. a kind of device for contactless Calibration according to claim 1, it is characterised in that: the telecentricity
It is consistent that the object plane different location of imaging lens corresponds to image amplification factor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920161204.1U CN209214550U (en) | 2019-01-30 | 2019-01-30 | A kind of device for contactless Calibration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920161204.1U CN209214550U (en) | 2019-01-30 | 2019-01-30 | A kind of device for contactless Calibration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209214550U true CN209214550U (en) | 2019-08-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920161204.1U Expired - Fee Related CN209214550U (en) | 2019-01-30 | 2019-01-30 | A kind of device for contactless Calibration |
Country Status (1)
| Country | Link |
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| CN (1) | CN209214550U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113029504A (en) * | 2021-03-04 | 2021-06-25 | 中国航空工业集团公司西安航空计算技术研究所 | Quantitative detection system and method for cooling air stagnation area of low-profile-rate gradually-expanding channel |
-
2019
- 2019-01-30 CN CN201920161204.1U patent/CN209214550U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113029504A (en) * | 2021-03-04 | 2021-06-25 | 中国航空工业集团公司西安航空计算技术研究所 | Quantitative detection system and method for cooling air stagnation area of low-profile-rate gradually-expanding channel |
| CN113029504B (en) * | 2021-03-04 | 2023-08-04 | 中国航空工业集团公司西安航空计算技术研究所 | Quantitative detection system and method for cooling air stagnation area of low-profile gradually-expanding channel |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190806 Termination date: 20220130 |