EP3134706A1 - Schutzvorrichtung für einen oberflächenspiegel eines optischen messsystems - Google Patents
Schutzvorrichtung für einen oberflächenspiegel eines optischen messsystemsInfo
- Publication number
- EP3134706A1 EP3134706A1 EP15709633.0A EP15709633A EP3134706A1 EP 3134706 A1 EP3134706 A1 EP 3134706A1 EP 15709633 A EP15709633 A EP 15709633A EP 3134706 A1 EP3134706 A1 EP 3134706A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- protective
- light beam
- reflection
- reflected
- protective screen
- 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.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/22—Measuring arrangements characterised by the use of optical techniques for measuring depth
Definitions
- the invention relates to a protective device for a surface mirror of an optical measuring system and its use according to the preamble of claim 1.
- the surface of the vehicle tire is illuminated with a laser beam and the light beam reflected by the surface is detected by an imaging light receiver or by a camera. Based on the displacement of the reflected light beam, which is dependent on the position of the respective reflection point on the surface structure, the profile depth is determined by means of the triangulation method.
- the measuring arrangement which has a light source and a camera, is embedded in the ground so that the tire of the vehicle to be measured can roll over a measuring surface.
- these measuring devices have a small installation space. In such small installation spaces, it is necessary to redirect the light beam of the laser light by means of surface mirrors.
- surface mirrors are necessary in these measuring systems so that reflection of the light beam results in no double reflection, which would falsify the image of the measured object and thus the determination of the profile depth.
- Surface mirrors are susceptible to scratching, so that in an environment in which contamination occurs, the surface of the surface mirrors is scratched by dirt particles. In addition, the surface can be scratched even when cleaning the surface mirror in addition.
- the object of the present invention is to provide the surface mirror
- the protective device with the characterizing features of claim 1 has the advantage that a protection of the reflection surface of the surface mirror is generated and thereby the reflection surface of the surface mirror is protected from scratching.
- the protective pane In order additionally to direct the resulting reflected radiation out of the field of view of the imaging light receiver, it is provided to arrange the protective pane in the light beam in such a way that the reflected radiation arising at the said protective pane is additionally directed into an area outside the imaging light receiver.
- a further additional protective screen for the imaging light receiver may additionally be arranged in the light beam in such a way that the reflected radiation arising at the further protective screen is directed into an area outside the measurement object and into an area outside the imaging area
- Light receiver is directed.
- Reflection surface of the surface mirror is arranged.
- the reflected radiation produced on the protective disk which reflects a reflection of an incident beam as a first reflected partial radiation arising at a front surface of the protective disk and a reflection of a reflected emergent beam emerging at a rear surface of the protective disk as a second Partial radiation comprises, is directed into the area outside the measurement object and optionally in the area outside of the imaging light receiver.
- the transparent protective pane can be a glass pane or a plastic pane permeable to the wavelength range used.
- the glass pane or the plastic pane advantageously has a tempered surface, for example, to minimize the resulting reflected radiation, an antireflection coating.
- a laser is suitably used as the light source.
- Protective device is advantageously used in a measuring arrangement for the optical testing of vehicle tires, in particular for non-contact optical determination of the tread depth of vehicle tires.
- Figure 1 shows a schematic representation of a measuring station for optical testing of a vehicle tire.
- the measuring station shown in FIG. 1 for testing vehicle tires 10 serves, for example, to measure the tread depth of the vehicle tire 10
- Vehicle tire 10 rolls on a road surface 11, in which a
- Measuring arrangement 20 is inserted.
- an opening 12 is further provided to the embedded in the ground measuring device 20.
- the vehicle tire 10 represents the measurement object.
- Measuring arrangement 20 has a light source, for example a laser 21 and an imaging light receiver, for example a camera 22.
- a light source for example a laser 21
- an imaging light receiver for example a camera 22.
- Laser 21 is not only a point or line laser into consideration, but any other expression of the laser beam, which is generated for example with diffractive optical elements.
- the use of a laser is not mandatory. There are also other sources of light possible.
- a light beam 30 emitted by the laser 21 is guided onto the vehicle tire 10.
- a radiation diffusely reflected by the vehicle tire 10 is detected by the camera 22. The picture taken by the camera 22 from the
- Vehicle tire 10 is from an evaluation unit, not shown
- Vehicle tire 10 determined.
- a surface mirror 40 is arranged, on whose reflection surface 41 the light beam 30 strikes an incident beam 32.
- the incident beam 32 is reflected at the reflection surface 41 and falls as a reflected incident beam 33 on the vehicle tire 10.
- the emergent beam 33 is reflected and received as diffuse reflected radiation in the form of an imaging light beam 34 from the camera 22 ,
- a transparent protective plate 50 having a front surface 51 and a rear surface 52 is arranged.
- the protective pane 50 extends in a planar manner at least over the reflection surface 41, so that the reflection surface 41 of the surface mirror 40 extends at least to the laser 21 and to the
- Vehicle tire 10, in particular to the opening 12 is covered out. Thereby, the reflection surface 41 of the surface mirror 50 before a
- the arrangement of the protective pane 50 in the light beam 30 is such that a reflected radiation 60 produced on the protective pane 50 is directed into an area outside the vehicle tire 10, so that the reflection arising on the protective pane 50 does not affect the measurement result.
- the reflected Radiation 60 comprises at least one reflection of the incident beam 32 on the front-side surface 51 of the protective screen 50 as the first reflected partial radiation 61 and a further reflection of the reflected incident beam 33 on the rear-side surface 52 of the protective screen 50 as the second reflected partial radiation 62 reflected
- Partial radiation 61 and 62 are in an area outside the
- Vehicle tire 10 directed.
- the protective screen 50 may be arranged in the light beam 30 in such a way that the reflected radiation 60 produced on the protective screen 60 with the reflected partial radiation 61 and 62 is moved into an area outside the light beam 30
- Vehicle tire 10 and in an area outside the camera 22 is directed.
- a further protective screen for protecting the camera 22 in the light beam 30, such that the reflected radiation produced at the further protective pane is directed into an area outside the vehicle tire 10 and into an area outside the camera 22.
- Protective glass 50 is arranged at a corresponding angle to the incident beam 32 and the reflection surface 41 of the surface mirror 40.
- a transparent protective screen 50 for example, a glass pane or a permeable for the wavelength range used is suitable
- Protective disk 50 come into consideration, which the light beam 30 is not too strong dampen. Expediently, the protective pane 50 has a tempered surface. To minimize the resulting reflected radiation 60, the glass pane or the plastic pane has, for example, an antireflection coating.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014207604.8A DE102014207604A1 (de) | 2014-04-23 | 2014-04-23 | Schutzvorrichtung für einen Oberflächenspiegel eines optischen Messsystems |
PCT/EP2015/054192 WO2015161946A1 (de) | 2014-04-23 | 2015-02-27 | Schutzvorrichtung für einen oberflächenspiegel eines optischen messsystems |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3134706A1 true EP3134706A1 (de) | 2017-03-01 |
Family
ID=52672234
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15709633.0A Withdrawn EP3134706A1 (de) | 2014-04-23 | 2015-02-27 | Schutzvorrichtung für einen oberflächenspiegel eines optischen messsystems |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3134706A1 (de) |
DE (1) | DE102014207604A1 (de) |
WO (1) | WO2015161946A1 (de) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19737919A1 (de) * | 1997-08-26 | 1999-03-11 | Joachim Buerger | Meßgerät zur Messung der Profiltiefe eines Kraftfahrzeugreifens |
US5987978A (en) * | 1997-04-02 | 1999-11-23 | Assembly Technology & Test Ltd. | Apparatus for testing tire tread depth |
WO2014095142A1 (de) * | 2012-12-21 | 2014-06-26 | Robert Bosch Gmbh | Vorrichtung und verfahren zur messung der profiltiefe eines reifens |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09226984A (ja) * | 1996-02-20 | 1997-09-02 | Hitachi Koki Co Ltd | 光センサユニット |
EP0816799A3 (de) * | 1996-07-04 | 1998-01-28 | Sun Electric UK Ltd. | Reifenkonditionsmessung |
DE19630607C1 (de) * | 1996-07-29 | 1997-10-23 | Microlas Lasersystem Gmbh | Vorrichtung zum Überwachen der Energie eines Laserstrahls |
DE102011007176B4 (de) * | 2011-04-12 | 2015-06-25 | Trumpf Werkzeugmaschinen Gmbh + Co. Kg | Vorrichtung zur Fokussierung eines Laserstrahls und Verfahren zum Überwachen einer Laserbearbeitung |
DE102012202271A1 (de) | 2011-07-11 | 2013-01-17 | Robert Bosch Gmbh | Vorrichtung und Verfahren zur Reifenprüfung |
-
2014
- 2014-04-23 DE DE102014207604.8A patent/DE102014207604A1/de not_active Withdrawn
-
2015
- 2015-02-27 WO PCT/EP2015/054192 patent/WO2015161946A1/de active Application Filing
- 2015-02-27 EP EP15709633.0A patent/EP3134706A1/de not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5987978A (en) * | 1997-04-02 | 1999-11-23 | Assembly Technology & Test Ltd. | Apparatus for testing tire tread depth |
DE19737919A1 (de) * | 1997-08-26 | 1999-03-11 | Joachim Buerger | Meßgerät zur Messung der Profiltiefe eines Kraftfahrzeugreifens |
WO2014095142A1 (de) * | 2012-12-21 | 2014-06-26 | Robert Bosch Gmbh | Vorrichtung und verfahren zur messung der profiltiefe eines reifens |
Non-Patent Citations (1)
Title |
---|
See also references of WO2015161946A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2015161946A1 (de) | 2015-10-29 |
DE102014207604A1 (de) | 2015-10-29 |
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Legal Events
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Extension state: BA ME |
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DAX | Request for extension of the european patent (deleted) | ||
17Q | First examination report despatched |
Effective date: 20180212 |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: BEISSBARTH GMBH |
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Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
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Effective date: 20191104 |
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18W | Application withdrawn |
Effective date: 20200421 |