DE29903385U1 - Protective glass sensor - Google Patents
Protective glass sensorInfo
- Publication number
- DE29903385U1 DE29903385U1 DE29903385U DE29903385U DE29903385U1 DE 29903385 U1 DE29903385 U1 DE 29903385U1 DE 29903385 U DE29903385 U DE 29903385U DE 29903385 U DE29903385 U DE 29903385U DE 29903385 U1 DE29903385 U1 DE 29903385U1
- Authority
- DE
- Germany
- Prior art keywords
- protective glass
- arrangement
- sensor
- bull
- contamination
- 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.)
- Expired - Lifetime
Links
- 239000011521 glass Substances 0.000 title claims description 19
- 230000001681 protective effect Effects 0.000 title claims description 18
- 230000005855 radiation Effects 0.000 claims description 14
- 238000011109 contamination Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 230000003595 spectral effect Effects 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 claims description 2
- 244000309464 bull Species 0.000 claims 3
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 239000005304 optical glass Substances 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/958—Inspecting transparent materials or objects, e.g. windscreens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
- B23K26/707—Auxiliary equipment for monitoring laser beam transmission optics
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/15—Preventing contamination of the components of the optical system or obstruction of the light path
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Optics & Photonics (AREA)
- Analytical Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Plasma & Fusion (AREA)
- Biochemistry (AREA)
- Mechanical Engineering (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Details Of Aerials (AREA)
- Glass Compositions (AREA)
Description
-2-Schutzglassensor-2-Protective glass sensor
Die Erfindung betrifft eine Anordnung zur Überwachung des Verschmutzungsgrades eines Schutzglases einer Schweißoptik.The invention relates to an arrangement for monitoring the degree of contamination of a protective glass of a welding optics.
Die Linsen einer Schweißoptik werden üblicherweise durch ein Schutzglas vor Verschmutzung geschützt, da die bei der Bearbeitung entstehenden Spritzer und Dämpfe ohne dieses Schutzglas das Bearbeitungsobjektiv verschmutzen würden. Um konstante Ergebnisse zu erzielen, muß das Schutzglas von Zeit zu Zeit ausgetauscht werden. Die Beurteilung des Schutzglaszustandes kann im einfachsten Fall durch Sichtkontrolle erfolgen.The lenses of a welding optic are usually protected from contamination by a protective glass, since the splashes and fumes generated during processing would contaminate the processing lens without this protective glass. In order to achieve consistent results, the protective glass must be replaced from time to time. The assessment of the condition of the protective glass can be carried out in the simplest case by visual inspection.
Um die Einflüsse des Verschmutzungsgrades des Schutzglases in einem geregelten Prozeßablauf berücksichtigen zu können, wurden in den Offenlegungsschriften DE 196 05 018 Al und DE 94 03 822 Ul Überwachungseinrichtungen vorgeschlagen, die das von den Schmutzpartikeln gestreute und seitlich aus dem Schutzglas austretende Laserlicht auswerten. Die Auswertung des seitlich aus dem Schutzglas austretenden Streulichtes wird von der vom Werkstück zurückreflektierten Laserstrahlung negativ beeinflußt. In order to be able to take the influence of the degree of contamination of the protective glass into account in a controlled process sequence, monitoring devices were proposed in the published specifications DE 196 05 018 Al and DE 94 03 822 Ul, which evaluate the laser light scattered by the dirt particles and emerging from the side of the protective glass. The evaluation of the scattered light emerging from the side of the protective glass is negatively influenced by the laser radiation reflected back from the workpiece.
Es ist Ziel der Erfindung, eine Anordnung zu schaffen, die die Ermittlung des Verschmutzungsgrades des Schutzglases ohne Beurteilung der gestreuten Laserstrahlung erlaubt.The aim of the invention is to create an arrangement that allows the degree of contamination of the protective glass to be determined without assessing the scattered laser radiation.
Erfindungsgeniäß wird dieses Ziel dadurch erreicht, daß seitlich des Schutzglases eine Sensoranordnung vorgesehen wird, die für die Laserstrahlung selbst unempfindlich ist und eine Empfindlichkeit für die von den Schmutzpartikeln ausgesandte Infrarot-Wärmestrahlung aufweist.According to the invention, this aim is achieved by providing a sensor arrangement on the side of the protective glass, which is insensitive to the laser radiation itself and is sensitive to the infrared heat radiation emitted by the dirt particles.
Die Wärmestrahlung ist für den Verschmutzungsgrad des Schutzglases kennzeichnend, da die Schmutzpartikel mit steigender Anzahl das Laserlicht immer stärker absorbieren und ihrerseits neue Infrarot-Wärmestrahlungsquellen darstellen. Wenn kein Schmutz vorhanden ist, wird nur sehr wenig Wärmestrahlung durch Absorption des Laserlichtes im Schutzglas erzeugt.The thermal radiation is characteristic of the degree of contamination of the protective glass, since the dirt particles absorb the laser light more and more as the number increases and in turn represent new sources of infrared thermal radiation. If there is no dirt, very little thermal radiation is generated by the absorption of the laser light in the protective glass.
Für den Nd:YAG-Laser bedeutet dies, daß die Sensoranordnung für die Wellenlänge 1064 nm unempfindlich ist und nur oberhalb dieses Bereiches eine Empfindlichkeit aufweist.For the Nd:YAG laser, this means that the sensor arrangement is insensitive to the wavelength 1064 nm and is only sensitive above this range.
Auch ist zum Vergleich eine parallele Anordnung mit einem zweiten Schutzglas, welches ebenfalls von der Laserstrahlung durchdrungen aber nicht verschmutzt wird und bei dem ebenfalls eine Sensoranordnung mit der beschriebenen spektralen Empfindlichkeit seitlich vorgesehen ist, möglich.For comparison purposes, a parallel arrangement with a second protective glass, which is also penetrated by the laser radiation but not contaminated and in which a sensor arrangement with the described spectral sensitivity is also provided on the side, is also possible.
Anstatt des Infrarotsensors kann erfindungsgemäß auch eine für die Laserstrahlung unempfindliche Anordnung mit einem Thermofühler verwendet werden.Instead of the infrared sensor, according to the invention, an arrangement with a thermal sensor that is insensitive to laser radiation can also be used.
Die Erfindung wird in Fig.l verdeutlicht. Dabei senden die sich auf dem Schutzglas 1 befindenden Schmutzpartikel 2 nach der Erwärmung durch Nd:YAG-Laserlicht 3 Wärmestrahlung 4 aus, welche bis zu einer Wellenlänge von 4500 nm von dem optischen Glas durch Totalreflektion oder direkt zur zylinderförmigen Seitenfläche 5 des Schutzglases weitergeleitet wird. Zusätzlich wird Laserstrahlung durcfraie Schmutzpartikel gestreut und weitergeleitet. Anschließend gelangt das Licht auf eine Scheibe 6, die das Laser-üehfcler Wellenlänge 1064 nm absorbiert. Das hier noch transmittierende Licht im Spektralbereich bis 4500 nm erreicht zu einem Teil den Temperaturfühler 7, der die Wärmestrahlung detektiert.The invention is illustrated in Fig. 1. The dirt particles 2 on the protective glass 1 emit heat radiation 4 after heating by Nd:YAG laser light 3, which is transmitted by the optical glass up to a wavelength of 4500 nm by total reflection or directly to the cylindrical side surface 5 of the protective glass. In addition, laser radiation is scattered and transmitted by free dirt particles. The light then reaches a disk 6, which absorbs the laser beam with a wavelength of 1064 nm. The light still transmitted here in the spectral range up to 4500 nm reaches a part of the temperature sensor 7, which detects the heat radiation.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE29903385U DE29903385U1 (en) | 1999-02-25 | 1999-02-25 | Protective glass sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE29903385U DE29903385U1 (en) | 1999-02-25 | 1999-02-25 | Protective glass sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE29903385U1 true DE29903385U1 (en) | 1999-05-12 |
Family
ID=8069937
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE29903385U Expired - Lifetime DE29903385U1 (en) | 1999-02-25 | 1999-02-25 | Protective glass sensor |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE29903385U1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10060176A1 (en) * | 2000-12-04 | 2002-06-06 | Precitec Kg | Laser processing head used for welding or cutting a workpiece using a laser beam comprises a housing, a focussing lens, a sensor arrangement, and a beam deviating unit |
| DE10113518A1 (en) * | 2001-03-20 | 2002-10-02 | Precitec Kg | Safety glass fouling measurement for laser processing head involves comparing scattered radiation with reference value to produce error signal if reference value is exceeded |
| WO2012139873A1 (en) | 2011-04-12 | 2012-10-18 | Trumpf Werkzeugmaschinen Gmbh + Co. Kg | Device for focusing a laser beam and method for monitoring a laser machining process |
| WO2020038863A1 (en) * | 2018-08-22 | 2020-02-27 | Autoliv Development Ab | Device and method for inspecting laser welding protective glass |
| WO2020064052A1 (en) | 2018-09-28 | 2020-04-02 | Scansonic Mi Gmbh | Laser processing device having optics protection and method for protecting the optics of a laser processing device |
-
1999
- 1999-02-25 DE DE29903385U patent/DE29903385U1/en not_active Expired - Lifetime
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10060176A1 (en) * | 2000-12-04 | 2002-06-06 | Precitec Kg | Laser processing head used for welding or cutting a workpiece using a laser beam comprises a housing, a focussing lens, a sensor arrangement, and a beam deviating unit |
| US6614002B2 (en) | 2000-12-04 | 2003-09-02 | Precitec Kg | Laser machining head |
| DE10060176B4 (en) * | 2000-12-04 | 2008-06-19 | Precitec Kg | Laser processing head |
| DE10113518A1 (en) * | 2001-03-20 | 2002-10-02 | Precitec Kg | Safety glass fouling measurement for laser processing head involves comparing scattered radiation with reference value to produce error signal if reference value is exceeded |
| DE10113518B4 (en) * | 2001-03-20 | 2016-05-19 | Precitec Kg | Method for measuring the degree of soiling of a protective glass of a laser processing head and laser processing system for carrying out the method |
| WO2012139873A1 (en) | 2011-04-12 | 2012-10-18 | Trumpf Werkzeugmaschinen Gmbh + Co. Kg | Device for focusing a laser beam and method for monitoring a laser machining process |
| DE102011007176A1 (en) | 2011-04-12 | 2012-10-18 | Trumpf Werkzeugmaschinen Gmbh + Co. Kg | Apparatus for focusing a laser beam and method for monitoring laser processing |
| DE102011007176B4 (en) * | 2011-04-12 | 2015-06-25 | Trumpf Werkzeugmaschinen Gmbh + Co. Kg | Apparatus for focusing a laser beam and method for monitoring laser processing |
| US9511450B2 (en) | 2011-04-12 | 2016-12-06 | Trumpf Werkzeugmaschinen Gmbh + Co. Kg | Apparatus for focusing a laser beam and method for monitoring a laser processing operation |
| WO2020038863A1 (en) * | 2018-08-22 | 2020-02-27 | Autoliv Development Ab | Device and method for inspecting laser welding protective glass |
| FR3085205A1 (en) * | 2018-08-22 | 2020-02-28 | Livbag Sas | DEVICE AND METHOD FOR TESTING PROTECTIVE GLASS OF LASER WELDER |
| WO2020064052A1 (en) | 2018-09-28 | 2020-04-02 | Scansonic Mi Gmbh | Laser processing device having optics protection and method for protecting the optics of a laser processing device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R409 | Internal rectification of the legal status completed | ||
| R207 | Utility model specification |
Effective date: 19990624 |
|
| R156 | Lapse of ip right after 3 years |
Effective date: 20020829 |
|
| R150 | Utility model maintained after payment of first maintenance fee after three years |
Effective date: 20021220 |
|
| R151 | Utility model maintained after payment of second maintenance fee after six years |
Effective date: 20050804 |
|
| R158 | Lapse of ip right after 8 years |
Effective date: 20070901 |