Z-LASER Optoelektronik GmbH Stemmer 3d Technologietag Useful information on Z-Lasers for Vision
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1 Z-LASER Optoelektronik GmbH Stemmer 3d Technologietag Useful information on Z-Lasers for Vision
2 The Company Core Competences How to Build a Z-LASER Electronics and Modulation Wavelength and Filter Triangulation 2
3 Who are we? Founded: 1985, today still privately owned Number of employees: About 70. (17 in R&D ) Annual turnover: EURO > 6 million Quality management: ISO 9001 since 1994 Worldwide Activity: Location: More than 40 representatives worldwide Freiburg, South Germany 3
4 What do we do? Full Service Provider: Wide range of proven standard products Technical advice and Instruction service R&D Projects Accessories Laser Safety Equipment R&D Capability Optical Design Mechanical Design Electronic Design Software Development 4
5 Core competences 1 Lasers for positioning Line, dot and cross lasers for cutting, drilling or position indicator. > Lasers in the field Laser projectors for projecting contours from CAD and other construction data on two or three-dimensional surfaces > 2000 Installations world-wide 6
6 Core competences 2 Lasers for Medical & bio-photonics Solutions for patient positioning for market leaders in medical imaging Specific pilot lasers for laser surgery (with fiber coupling if required) Laser sources for various applications in biophotonics and life sciences 7
7 Core competences 3 Laser as structured light for Machine Vision and Imaging Micro lines with homogeneous or Gaussian light distribution Multi-lines, line grids, dot matrices, circles and many customized patterns External intensity control with modulation up to 50MHz Intelligent Laser with µcontroller 8
8 Product range Diode and DPSS Laser Power from 1 mw to 7 W in a variety of packages Wavelength from 400 to 1500 nm Micro and Macro Line projection Free beam and fiber coupling Customized Lasers R&D service Please check our website: 9
9 LASER L ight A mplification by S timulated E mission of R adiation First Laser was invented 51 Years ago by Theodore Maiman in
10 How it works Or: How to built a perfect vision laser All you need is: Laser Diode or DPSS Beam shaping and Optics Line and pattern generator Electronics and Microcontroller Software and Interface to PC or PLC Industrial grade Housing Tuning and QC 11
11 Diode lasers Diode lasers : Directly emitting from semiconductor Colors IR, Red, Green and Violet Output power from mw to Watts Beam profiles are typically elliptical Wide temperature range Long lifetime Small size, 12
12 DPSS lasers DPSS lasers : Diode Pumped Solid State Colors : Green, Blue, Red, Yellow Output power from mw to Watt Beam profiles are almost circular Limited temperature range Shorter lifetime Mode hops 13
13 Line Generators Cylinder lens - Gaussian light distribution - very thin lines possible Powell lens - homogeneous light distribution - various fan angles - Long working distances Micro array lens - homogeneous light distribution - Smaller line thickness - perfect for small working distances 14
14 DOE - Projection DOE s turn a laser beam into a complex pattern! The base here is the microstructure of the DOE which acts like a router for photons directing their way to propagate through free space. A Diffractive Optical Element utilizes a surface with a complex microstructure for its optical function. The microstructured surface relief profile has two or more surface levels. The surface structures are either etched in fused silica or other glass types, or embossed in various polymer materials. 15
15 Some examples Many more are available! Customized designs are possible! 16
16 Block Diagram LASER Controller TEC Controller MCU Laser Controller Laser Diode Photo Detector 1 TEC/NTC Photo Detector 2 A/D A/D I/U I/U 18
17 APC automatic power control Vision Applications require constant Intensity of the laser! We stabilize our laser to constant output while constantly controlling the input current Photodiode Feedback Control 19
18 Modulation input current vs. output power Continous Wave (CW) => Constant output Power Analogue Modulation => Intensity follows the current in a linear fashion 20
19 Modulation Digital Modulation (TTL) => synchronize the laser to the camera High modulation frequency possible Pulse Width Modulation (PWM) => Varying the intensity by changing the ON/OFF ratio of the laser No analogue signal is needed to change brightness of the laser Digital Control with PC or PLC I²C, RS232, RS485, USB, Ethernet 21
20 Modulation Z-LASER Flagship Electronics allow Digital and Analogue modulation at the same time up to several MHz!! Benefit? Synchronizing with Camera and changing intensity to react to variations in the scene in real-time! 22
21 Wavelength and Filter 400nm 1500nm GaN laser diode DPSS Laser diode gap InGaAlP laser diode Typical Laser Diode Wavelength: UV: Blue: Green: Red: IR: 375nm 395nm 405nm 415nm 450nm 488nm 515nm 532nm 635nm 640nm 650nm 660nm 670nm 685nm 730nm 780nm 808nm 830nm 850nm 900nm 980nm 1060nm 1260nm 1500nm 23
22 Wavelength and Filter How to choose the right wavelength? Availability, Price, Power, Laser class Spectral response of the camera Spectral reflectivity of the inspected surface Spectral transmission of optics Wavelength depended effects ( i.e. Speckle) 24
23 Wavelength and Filter Why use filters? To get perfect results from camera, the illumination of the object must be constant. Results can be affected by environmental light, Filter can increase signal / noise ratio to suppress light emission from material Usage of multiple cameras with illumination at other wavelengths to see special material which rely upon certain effects like fluorescence for example. 25
24 Wavelength and Filter Good filters? good peak transmission at center wavelength (>90%) and blocking beside Bandwidth of +-10 / +-20 / ( FWHM -> Full width at half maximum ) tight flanks Availability in different sizes ( Diameter or Thread mount) Can be provided accordingly to the Laser Diode wavelength. Low thermal effect. But! If bandwidth is too small the laser may drift in the blocking wavelength (0,02 to 0,3nm / K) Best effect can be achieved using a temperature stabilized laser module Be aware of the fact that bandwidth is also depended on tilt of light! 26
25 Polarization Laser Light usually is polarized! Reflection can be suppressed using polarization filter polarized light can either blocked or transmitted through filter Undesired reflection Laser Camera Pol - filter Object 27
26 Speckles Laser Light is coherent -> Speckle! Speckle can be reduced by destroying the coherency! Broaden the bandwidth of the laser ( SLD ) dynamically diffusing a coherent beam Shorter wavelengths show less speckle ( green, blue, UV) Speckle can by useful! Surface inspection Measuring strain Measuring Vibration (holographic interferometry) 28
27 Triangulation Assuming the geometry of the projection is stable and known, a camera can image the laser line and calculate the 3d shape using 2d data Camera High resolution h 60 Laser Camera Big range Laser h 30 29
28 Triangulation Using Multi line or dot array projection the resolution can be enhanced and more data can be gained in one camera frame 30
29 Triangulation examples Candle Inspection -Attendence check of wick -Check of circularity Inspection of screws -Quality inspection (circularity, failures) -particularity: very thin line required Inspection of drain pipes -Search for disruptions and sedimentation 31
30 Triangulation examples Solder paste inspection - particularity: very thin line required Lumber / log scan 32
31 Triangulation examples Dental implant scan - Variance analysis Surface inspection of steel slabs - particularity: green or blue laser required 33
32 Triangulation examples 360 3D SCANNER Requirement : 3 lasers with modulation. Solution: Z20M18S-640-lp60 + H6-M18 Italian Customer High Speed machine to slice Salami 34
33 Triangulation examples Train Wheel inspection: Quality and wear inspection Wheel thickness measurement 3D profiling High power reds show best performance Filters are used together with CCD Lasers fitted underneath track at a train service station.! 35
34 Triangulation examples Tyre wall inspection: Check for numbers / codes Single lines are used Red low power lasers used together with filter 36
35 Triangulation examples 3D Reconstruction Point cloud Projection Single mode 808 nm Laser 1000 mw! 37
36 Thank you for your attention! If you have any questions, do not hesitate to contact me! Thomas Lang Tel: +49 /
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