CN102809351B - Wall thickness detecting device and wall thickness detecting method for transparent and semitransparent glass bottles - Google Patents
Wall thickness detecting device and wall thickness detecting method for transparent and semitransparent glass bottles Download PDFInfo
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- CN102809351B CN102809351B CN201210277480.7A CN201210277480A CN102809351B CN 102809351 B CN102809351 B CN 102809351B CN 201210277480 A CN201210277480 A CN 201210277480A CN 102809351 B CN102809351 B CN 102809351B
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Abstract
The invention discloses a wall thickness detecting device and a wall thickness detecting method for transparent and semitransparent glass bottles. The device comprises a laser emitter and an image shooting device which are correspondingly arranged relative to a normal in a detecting point on a glass bottle to be detected, wherein the emitting end of the laser emitter is toward the detecting point; a central axis of the emitting end of the laser emitter is in an acute angle to the level; an included angle between the central axis of the emitting end of the laser emitter and a normal at the detecting point is an acute angle; and light emitted by reversely refracting a laser ray from the laser emitter through the internal and external walls of the glass bottle to be detected is received via the image shooting device. The method disclosed by the invention is carried out based on the device, the wall thickness at the detecting point is obtained by calculation by measuring the pixel distance of two shot parallel light spots formed on the internal and external walls. The device and method provided by the invention are suitable for detecting the wall thickness of a colorless transparent glass bottle and semitransparent glass bottles with deep colors such as brown semitransparent glass bottle and green semitransparent glass bottle on real time in a quick, accurate and non-contact way.
Description
Technical field
The present invention relates to a kind of vial Wall Thickness Testing Device and method, espespecially a kind of apparatus and method being applicable to that the bottle wall thickness of colourless transparent glass bottle and the dark translucent glass bottle such as brown, green is detected.
Background technology
In vial process of manufacture, need Measurement accuracy glass bottle wall thickness, to ensure the crudy of glass body.
At present, most domestic vial manufacturer still adopts the measuring instrument of contact to carry out wall thickness measuring to vial, and the measuring method of this contact exists that precision is not high, labor intensive material resources, be unfavorable for the shortcomings such as on-line checkingi.
Existing contactless measuring method mainly adopts photoelectric tube or other light-sensitive elements to receive the reflection ray of laser at bottle wall surface, obtains a bottle wall thickness by the peak separation calculating the corresponding signal converted to by the reflection ray of reception.But, because glass bottle surface is mostly arc-shaped surface, therefore, the luminous point that laser incides bottle surface easily offsets, and, when the out-of-flatness of bottle inside and outside wall, laser is just larger in the skew of the reflection angle of inside and outside wall, is easy to cause measurement inaccurate.In addition, when detecting for the dark translucent glass bottle such as brown, green, because vial light transmittance is lower, therefore, the difficulty that this contactless measuring method detects wall thickness is very large.
For the problems referred to above, there is the hot spot using CCD camera reception laser to be formed on the wall of glass bottle inside and outside at present, pixel distance between the hot spot formed respectively on bottle inside and outside wall by measurement laser emission point, calculate the optical detecting method of bottle wall thickness, this optical detecting method is: generating laser 1 horizontal positioned, to vial 5 side Emission Lasers light beam, this laser beam is a kind of diverging light, be mapped on bottle wall and can form a wire light, as Fig. 1, E point is laser emission point, the laser that laser emission point E point is launched is received by CCD camera 2 via the reflection ray P1 penetrated after the reflection of vial 5 outer wall, EF is incident ray, the laser launched forms a wire hot spot 41 on pip F point, CCD camera 2 actual photographed to be hot spot 41 and the laser emission point E point mirror image E ' point relative to vial 5 outer wall, and laser emission point E point is refracted in bottle and via after the reflection of vial 5 inwall, penetrate via outer wall refraction again, as Fig. 1, G point is the pip that the laser beam in incident bottle carries out reflecting on inwall, pip G point is also formed a wire hot spot 42, P3 is the actual emergent ray that the light that goes out via G point reflection is corresponding, the light that CCD camera 2 reality receives is the emergent ray P2 (words visually seen, think that G point is on G ' point), as shown in Figure 1, CCD camera 2 actual photographed to be hot spot 42 and the laser emission point E point mirror image E relative to vial 5 inwall " point.That is, two parallel hot spots, 41,42 and two mirror image E ' are had to put and E in the image that CCD camera 2 photographs " point; as shown in Figure 2; by measuring the pixel distance between two hot spots 41,42; and according to the transformational relation between the pixel distance set in advance and actual range, calculate bottle wall thickness FH.But, as can be seen from Figure 2, E ' point is overlapping with hot spot 41; E " point and hot spot 42 are apart from very near, therefore, there is the E ' of dazzle and E " point can affect identification to hot spot 41,42 respectively, thus cannot pixel distance between Measurement accuracy hot spot 41,42, the bottle wall wall thickness obtained is also just inaccurate.As can be seen here, this kind of optical detecting method also has the true defect of dysmetria.
Summary of the invention
The object of the present invention is to provide a kind of transparent and translucent glass bottle Wall Thickness Testing Device and method, these apparatus and method can accurately measure transparent and wall thickness that is translucent glass bottle, for vial quality testing provides foundation.
To achieve these goals, the present invention is by the following technical solutions:
A kind of transparent and translucent glass bottle Wall Thickness Testing Device, it is characterized in that: it comprises generating laser, image-pickup device, this generating laser and the normal corresponding setting of this image-pickup device relative to the test point place on vial to be detected, wherein: the transmitting terminal of this generating laser towards this test point on this vial to be detected and the axis of the transmitting terminal of this generating laser horizontal by an acute angle, angle between the vertical plane at the normal place at this test point place on the axis of the transmitting terminal of this generating laser and this vial to be detected is acute angle, this image-pickup device receives laser beam that this laser transmitter projects goes out via in this vial to be detected, the light penetrated after outer wall generation catadioptric, this generating laser, the control end of image-pickup device is connected with the corresponding controling end of computer control system respectively.
Described image-pickup device is image capture device, this image capture device is positioned at the laser beam that described laser transmitter projects goes out and carries out reflecting on the direction residing for the reflection ray of rear injection via described test point place, and the angle of the picked-up end of this image capture device towards described test point and between the normal at the axis of the picked-up end of this image capture device and described test point place equals the angle between the axis of the transmitting terminal of described generating laser and the normal at described test point place.Or, described image-pickup device comprises image capture device and speculum, this speculum is positioned at the laser beam that described laser transmitter projects goes out and carries out reflecting on the direction residing for the reflection ray of rear injection via described test point place, the setting corresponding with this speculum of this image capture device, this image capture device receives laser beam that described laser transmitter projects goes out via the light penetrated after the inside and outside wall generation catadioptric of described vial to be detected by this speculum.
The axis of the transmitting terminal of described generating laser and horizontal plane be the scope of acute angle be 5 degree to 30 degree.The scope of the angle between the normal at the described test point place on the axis of the transmitting terminal of described generating laser and described vial to be detected is 30 degree to 60 degree.
Described generating laser is the linear laser transmitter with laser shaping lens; Further, when double Clear glass bottles and jars wall thickness detects, centered by described generating laser, wavelength is greater than 580nm and is less than the high-power linear red laser transmitter of 650nm, and the angle of divergence is between 1 degree to 5 degree.
Described vial to be detected transmits on conveyer, described vial to be detected is sent to and detects position by this conveyer, make to be set up at this detecting position, the described test point on described vial to be detected accepts the wall thickness that described generating laser and described image-pickup device carry out and detects.Described conveyer is provided with rotating device, and described vial to be detected is placed on this rotating device.
A kind of transparent and translucent glass bottle method for testing wall thickness realized based on described transparent and translucent glass bottle Wall Thickness Testing Device, it is characterized in that, it comprises step: described generating laser is to the test point Emission Lasers on described vial to be detected, this laser penetrates after carrying out catadioptric via the inside and outside wall that the described test point on described vial to be detected is corresponding, described image-pickup device takes this laser at this outer wall, the wire hot spot that inwall is formed respectively, thus take the transformational relation between the pixel distance of image and actual range according to described image-pickup device, described computer control system calculates the wall thickness at the described test point place on described vial to be detected by the pixel distance measured between these parallel two hot spots apart.
Described method also comprises: before Emission Lasers, first according to optical absorption and the reflection feature of described detected vial, regulates described generating laser and orientation angles, distance between image-pickup device and described vial to be detected respectively.
Advantage of the present invention is:
The present invention is by vertical direction, the mode of laser oblique incidence wall, solve mirror image that laser in prior art produces at wall and hot spot merges the hot spot interference problem brought, in the present invention, the hot spot that wall produces does not overlap with the mirror image that dazzle occurs, do not interfere with each other between the two, hot spot can go out by accurate recognition, thus the accurate Calculation making the present invention's pixel distance passed through between measurement two hot spots just can realize wall thickness.The present invention is applicable to carry out quick, accurate, contactless real-time detection to the bottle wall thickness of colourless transparent glass bottle and the dark translucent glass bottle such as brown, green.
Accompanying drawing explanation
Fig. 1 is the measuring principle schematic diagram of the optical detecting method based on CCD camera realization;
Fig. 2 is in the optical detecting method realized based on CCD camera, the image schematic diagram that CCD camera photographs;
Fig. 3 is the composition schematic diagram of the transparent and translucent glass bottle Wall Thickness Testing Device of the present invention;
Fig. 4 is the Cleaning Principle schematic diagram of the transparent and translucent glass bottle method for testing wall thickness of the present invention;
Fig. 5 is that A looks in direction from Fig. 4, the Cleaning Principle schematic diagram of the transparent and translucent glass bottle method for testing wall thickness of the present invention;
Fig. 6 is the transparent image schematic diagram photographed with the CCD camera in translucent glass bottle method for testing wall thickness of the present invention.
Detailed description of the invention
As shown in Figures 3 to 5, the present invention proposes a kind of transparent and translucent glass bottle Wall Thickness Testing Device, it comprises generating laser 10, image-pickup device, (O point is the cross-section center of vial to be detected relative to the normal MO at test point (wall thickness of this test point position is the wall thickness that will measure) 60 places on vial 50 to be detected for this generating laser 10 and this image-pickup device, normal MO is normal when light reflects on outer wall residing for this test point 60) corresponding setting, wherein: the transmitting terminal of this generating laser 10 towards this test point 60 on this vial 50 to be detected and the axis 11 of the transmitting terminal of this generating laser 10 horizontal by an acute angles beta, angle α between the normal MO at this test point 60 place on the axis 11 of the transmitting terminal of this generating laser 10 and this vial 50 to be detected is acute angle, this image-pickup device receives laser beam that this generating laser 10 launches via in this vial 50 to be detected, the light penetrated after outer wall generation catadioptric, this generating laser 10, the control end of image-pickup device is connected with the corresponding controling end of computer control system (not shown) respectively.
As Fig. 4, this image-pickup device can be only made up of image capture device 20, this image capture device 20 is positioned at the laser beam that generating laser 10 launches and carries out reflecting on the direction residing for the reflection ray of rear injection via test point 60 place, and the angle α ' of the picked-up end of this image capture device 20 towards test point 60 and between the normal MO at the axis of the picked-up end of this image capture device 20 and test point 60 place equals the angle α between the axis 11 of the transmitting terminal of generating laser 10 and the normal MO at test point 60 place.
As Fig. 3, this image-pickup device can comprise image capture device 20 and speculum 30, this speculum 30 is positioned at the laser beam that generating laser 10 launches and carries out reflecting on the direction residing for the reflection ray of rear injection via test point 60 place, reflection angle alpha at the light of test point 60 place reflection ' equal incidence angle α, this image capture device 20 and the corresponding setting of this speculum 30, this image capture device 20 receives laser beam that generating laser 10 launches via the light penetrated after the inside and outside wall generation catadioptric of vial 50 to be detected by this speculum 30.As Fig. 3, arranging of this reflective mirror 30 can make the position of image capture device 20 adjustable, thus makes the structure of whole Wall Thickness Testing Device become compact, is more suitable for the requirement of industry spot.
In actual design, the scope that the axis of the transmitting terminal of generating laser 10 11 is acute angles beta with horizontal plane institute is 5 degree to 30 degree, and such as, β gets 5,20,30 degree, and generating laser 10 and image-pickup device are not in same level.Such inclined design can realize wire hot spot 402 that laser beam formed at inwall and the mirror image A of laser beam relative to inwall " being separated between point; mirror image A " point can not be overlapping with wire hot spot 402, making mirror image A " dazzle of putting can not produce interference to wire hot spot 402; and hot spot 402 is convenient to identification, thus can calculate the pixel distance between two hot spots 401,402 accurately.
In actual design, the scope of the angle α between the normal MO at test point 60 place on the axis 11 of the transmitting terminal of this generating laser 10 and vial to be detected 50 is 30 degree to 60 degree, to ensure that the reflective light intensity of laser beam is maximum, inwall reflection is closer to total reflection, such as, α gets 30,45,60 degree.
In the present invention, this generating laser 10 is for having the linear laser transmitter of laser shaping lens.Further, when double Clear glass bottles and jars wall thickness detects, generating laser is elected centre wavelength further as and is greater than 580nm and the high-power linear red laser transmitter being less than 650nm, and the angle of divergence is between 1 degree to 5 degree.Be greater than 580nm and the centre wavelength being less than 650nm ensure that translucent glass bottle, especially the light transmittance of Brown Glass Brown glass bottles and jars only can reach the highest, and small divergence angle ensure that laser rays ankylose is fitted, and the light live width be irradiated on bottle wall is enough thin.In the present invention, generating laser 10 is a kind of spot lights launching diverging light, and the laser beam be irradiated on bottle wall is wire, as shown in Figure 5.
In actual design, image-pickup device and generating laser 10 all can be arranged on corresponding adjustment member, by the movement of this adjustment member, distance and angulation etc. between the test point 60 on adjustable image-pickup device and generating laser 10 and vial to be detected 50.Image-pickup device and generating laser 10 respectively should depending on actual testing requirements apart from the distance of test point 60, usually, the light live width that generating laser 10 should be made to be irradiated on bottle wall meets testing requirement, and the image definition that image-pickup device should be made to absorb meets testing requirement.
As Fig. 3, vial 50 to be detected can transmit on conveyer 40, vial 50 to be detected is sent to and detects position by this conveyer 40, test point 60 on the vial to be detected 50 that is set up at this detecting position is accepted, and wall thickness that generating laser 10 and image-pickup device carry out detects, and the control end of this conveyer 40 is connected with the corresponding controling end of computer control system.The design of conveyer 40 can realize the continuous detection to multiple vial wall thickness, and, also assures that vial to be detected when detecting wall thickness and relative position relation between generating laser and image-pickup device constant, avoid because vial to be detected and the relative position between generating laser and image-pickup device move caused measure error.
Further, this conveyer 40 can be provided with rotating device (not shown), vial 50 to be detected is placed on this rotating device, and the control end of this rotating device is connected with the corresponding controling end of computer control system.The design of this rotating device makes to arrive the detection that the vial to be detected 50 detecting position can carry out self wall thickness 360 degree, realizes the comprehensive detection to bottle wall thickness.
Based on above-mentioned transparent and translucent glass bottle Wall Thickness Testing Device, the invention allows for a kind of transparent and translucent glass bottle method for testing wall thickness, it comprises step: generating laser 10 is to test point 60 Emission Lasers on vial 50 to be detected, this laser penetrates after carrying out catadioptric via the inside and outside wall of test point 60 correspondence on vial 50 to be detected, image-pickup device takes this laser at this outer wall, the wire hot spot 401 that inwall is formed respectively, 402, thus take the transformational relation between the pixel distance of image and actual range according to image-pickup device computed in advance, computer control system is by measuring these parallel two hot spots 401, between 402, pixel distance apart calculates the wall thickness at this test point 60 place on vial 50 to be detected.Subsequently, just by the difference of the actual wall thickness value that detects and standard wall thickness value, judge that whether this vial to be detected is qualified.
In reality detects, before Emission Lasers, first according to the optical absorption of vial 50 to be detected and reflection feature, generating laser 10 and the orientation angles between image-pickup device and vial to be detected 50, distance should be regulated respectively.
In addition, in actual testing process, due to the inhomogeneities of the material of bottle wall own and the existence of impure point, the imaging of the linear beam spot of the inside and outside wall of vial may be affected, and can produce astigmatism, therefore, filtering can be utilized to remove the spurious signal of astigmatism generation.Also have, on the Clear glass bottles and jars bottle wall that refractive index is higher, because the multipath reflection of laser may produce multilinear hot spot on vial inside and outside wall, therefore, by the intensity of computer control system intelligent decision multilinear hot spot, hot spot is screened, thus obtains wall thickness value accurately.
As shown in Figures 4 to 6, Cleaning Principle of the present invention is described below in detail.
As Fig. 4, horizontal by the generating laser 10 of skewed setting to the test point 60 Emission Lasers light beam on vial 50 to be detected, A point is laser emission point, and AB is incident ray, and the laser that laser emission point A point is launched is divided into two parts.Part light is via injection after outer wall reflection, B point is the pip of laser beam on the outer wall of vial 50 to be detected launched, when laser is irradiated on outer wall, at pip B point place's formation wire hot spot 401, reflection ray via injection after outer wall reflection is L1, reflection ray L1 is received by image capture device 20, and incidence angle α equals angle of emergence α '.Another part light is injected in the bottle wall of vial 50 to be detected, and carry out reflecting via inwall, injection after outer wall refraction, BC is the light in incident bottle wall, C point is the pip on inwall, when laser incides on inwall, be the actual emergent ray that the light that goes out via C point reflection is corresponding at pip C point place's formation wire hot spot 402, L3, the actual light received of image capture device 20 is emergent ray L2, as shown in Figure 4.As Fig. 6, image capture device 20 actual photographed to be hot spot 401 and 402, and laser emission point A point respectively relative to outer wall, inwall mirror image A ' put and A " point.Can find out in the image that image capture device 20 photographs, the hot spot 401 in wire is parallel with hot spot 402 and show as bright band separately, and mirror image A ' puts and A " point is respectively away from hot spot 401,402.Here it should be noted that, compared with the existing optical detecting method realized based on CCD camera, in the present invention, exactly because generating laser 10 is not horizontally disposed with, but the axis 11 of the transmitting terminal of generating laser 10 and horizontal plane arrange the reason of (inclination angle beta), just make wire hot spot 402 and mirror image A " point between the two away from; there is the mirror image A of dazzle " point can not be overlapping with wire hot spot 402, thus the identification to hot spot 402 can not be disturbed, similarly, mirror image A ' point also can not disturb the identification to wire hot spot 401.According to laser triangulation principle, there is certain relation in the spot displacement that light beam produces at vial inside and outside wall surface reflection and vial wall thickness dimension.Thus, computer control system to measure between hot spot 401 and hot spot 402 pixel distance d apart, and take the transformational relation (determination of transformational relation and the known technology being calculated as this area of geometry) between the pixel distance of image and actual range according to image capture device 20 computed in advance, just the wall thickness at test point 60 place on vial 50 to be detected can finally be calculated, i.e. the length of line segment BD.
The present invention is by vertical direction, the mode of laser oblique incidence wall, solve mirror image that laser in prior art produces at wall and hot spot merges the hot spot interference problem brought, in the present invention, the hot spot that wall produces does not overlap with the mirror image that dazzle occurs, do not interfere with each other between the two, hot spot can go out by accurate recognition, thus the accurate Calculation making the present invention's pixel distance passed through between measurement two hot spots just can realize wall thickness.The present invention is applicable to carry out quick, contactless real-time detection to the bottle wall thickness of colourless transparent glass bottle and the dark translucent glass bottle such as brown, green.
The above-mentioned know-why being preferred embodiment of the present invention and using; for a person skilled in the art; when not deviating from the spirit and scope of the present invention; any based on apparent changes such as the equivalent transformation on technical solution of the present invention basis, simple replacements, all belong within scope.
Claims (10)
1. a transparent and translucent glass bottle Wall Thickness Testing Device, it is characterized in that: it comprises generating laser, image-pickup device, this generating laser and the normal corresponding setting of this image-pickup device relative to the test point place on vial to be detected, wherein:
The transmitting terminal of this generating laser towards this test point on this vial to be detected and the axis of the transmitting terminal of this generating laser horizontal by an acute angle, angle between the vertical plane at the normal place at this test point place on the axis of the transmitting terminal of this generating laser and this vial to be detected is acute angle, this image-pickup device receives laser beam that this laser transmitter projects goes out via in this vial to be detected, the light penetrated after outer wall generation catadioptric, this generating laser, the control end of image-pickup device is connected with the corresponding controling end of computer control system respectively.
2. transparent and translucent glass bottle Wall Thickness Testing Device as claimed in claim 1, is characterized in that:
Described image-pickup device is image capture device, this image capture device is positioned at the laser beam that described laser transmitter projects goes out and carries out reflecting on the direction residing for the reflection ray of rear injection via described test point place, and the angle of the picked-up end of this image capture device towards described test point and between the normal at the axis of the picked-up end of this image capture device and described test point place equals the angle between the axis of the transmitting terminal of described generating laser and the normal at described test point place.
3. transparent and translucent glass bottle Wall Thickness Testing Device as claimed in claim 1, is characterized in that:
Described image-pickup device comprises image capture device and speculum, this speculum is positioned at the laser beam that described laser transmitter projects goes out and carries out reflecting on the direction residing for the reflection ray of rear injection via described test point place, the setting corresponding with this speculum of this image capture device, this image capture device receives laser beam that described laser transmitter projects goes out via the light penetrated after the inside and outside wall generation catadioptric of described vial to be detected by this speculum.
4. transparent and translucent glass bottle Wall Thickness Testing Device as claimed in claim 1, is characterized in that:
The axis of the transmitting terminal of described generating laser and horizontal plane be the scope of acute angle be 5 degree to 30 degree.
5. transparent and translucent glass bottle Wall Thickness Testing Device as claimed in claim 1, is characterized in that:
The scope of the angle between the normal at the described test point place on the axis of the transmitting terminal of described generating laser and described vial to be detected is 30 degree to 60 degree.
6. transparent and translucent glass bottle Wall Thickness Testing Device as claimed in claim 1, is characterized in that:
Described generating laser is the linear laser transmitter with laser shaping lens; Further, when double Clear glass bottles and jars wall thickness detects, centered by described generating laser, wavelength is greater than 580nm and is less than the high-power linear red laser transmitter of 650nm, and the angle of divergence is between 1 degree to 5 degree.
7. transparent and translucent glass bottle Wall Thickness Testing Device as claimed in claim 1, is characterized in that:
Described vial to be detected transmits on conveyer, described vial to be detected is sent to and detects position by this conveyer, make to be set up at this detecting position, the described test point on described vial to be detected accepts the wall thickness that described generating laser and described image-pickup device carry out and detects.
8. transparent and translucent glass bottle Wall Thickness Testing Device as claimed in claim 7, is characterized in that:
Described conveyer is provided with rotating device, and described vial to be detected is placed on this rotating device.
9., based on the transparent transparent and translucent glass bottle method for testing wall thickness realized with translucent glass bottle Wall Thickness Testing Device according to any one of claim 1 to 8, it is characterized in that, it comprises step:
Described generating laser is to the test point Emission Lasers on described vial to be detected, this laser penetrates after carrying out catadioptric via the inside and outside wall that the described test point on described vial to be detected is corresponding, described image-pickup device takes this laser at this outer wall, the wire hot spot that inwall is formed respectively, thus take the transformational relation between the pixel distance of image and actual range according to described image-pickup device, described computer control system calculates the wall thickness at the described test point place on described vial to be detected by the pixel distance measured between these parallel two hot spots apart.
10. transparent and translucent glass bottle method for testing wall thickness as claimed in claim 9, is characterized in that:
Described method also comprises: before Emission Lasers, first according to optical absorption and the reflection feature of described detected vial, regulates described generating laser and orientation angles, distance between image-pickup device and described vial to be detected respectively.
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| CN201210277480.7A CN102809351B (en) | 2012-08-06 | 2012-08-06 | Wall thickness detecting device and wall thickness detecting method for transparent and semitransparent glass bottles |
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| CN201210277480.7A CN102809351B (en) | 2012-08-06 | 2012-08-06 | Wall thickness detecting device and wall thickness detecting method for transparent and semitransparent glass bottles |
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| IT201800005143A1 (en) | 2018-05-08 | 2019-11-08 | Method for checking an object made of transparent material and related control system | |
| CN113654473A (en) * | 2021-08-06 | 2021-11-16 | 河北光兴半导体技术有限公司 | Measuring method, processor and measuring device for glass tube |
| CN113790674A (en) * | 2021-08-06 | 2021-12-14 | 河北光兴半导体技术有限公司 | Measuring method, processor and measuring device for glass product |
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| EP0320139A3 (en) * | 1987-12-08 | 1990-08-08 | Emhart Industries, Inc. | Optical measurement of wall thickness of transparent articles |
| US6806459B1 (en) * | 2001-08-30 | 2004-10-19 | Owens-Brockway Glass Container Inc. | Measurement of transparent container sidewall thickness |
| US7582856B2 (en) * | 2006-06-02 | 2009-09-01 | Emhart Glass S.A. | Out of round detector |
| DE102007049381A1 (en) * | 2007-10-15 | 2009-04-16 | Heidelberger Druckmaschinen Ag | Device for controlling and regulating an applied adhesive layer in the production of printed products |
| CN101726253A (en) * | 2008-10-31 | 2010-06-09 | 徐熙平 | Photoelectric detection system for wall thickness of quartz tube |
| CN202748007U (en) * | 2012-08-06 | 2013-02-20 | 北京大恒图像视觉有限公司 | Wall thickness detection device for transparent and semitransparent glass bottles |
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