Ian Alderton Alrad Imaging and Alrad Photonics. divisions of Alrad Instruments Ltd

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1 Use of lasers in 3D imaging Ian Alderton Alrad Imaging and Alrad Photonics divisions of Alrad Instruments Ltd Superior Reliability & Performance P. 1

2 Introduction Trends Camera Interfaces Sensor Size 3D basics ALG line Lens Coherent Stingray Line Uniformity and Straightness Applications Superior Reliability & Performance P. 2

3 Curent Trends Higher resolution sensors VGA for speed 1.2MP main digital level, up to 29MP Improved CMOS sensors global shutter, large area, sensitivity, scmos Faster interfaces USB3, 10GigE Vision, CoaXPress, CLHS New Sensors for industrial applications InGaAs for NIR, Bolometer for LWIR (thermal) Improvements & new developments in optics resolution (10MP), design (telecentric & custom) Improvements in Lighting technology High Intensity LEDs, new designs Superior Reliability & Performance P. 3

15MP machine speed is faster than 5MP: Super-high resolution camera : improved speed 2.

4 15MP machine speed is faster than 5MP: Super-high resolution camera : improved speed Mega Camera requires 30 images 15 Mega Camera requires 12 images Superior Reliability & Performance P. 4

5 Camera Interfaces Analogue EIA/NTSC 60i CCIR/PAL 50i fields/sec Firewire A (400) MB/s Firewire B (800) MB/s (1600) 196 MB/s USB2 USB3 60 MB/s MB/s CameraLink Base 255 MB/s to Full 680 MB/s CoaXPress Base (up and down bidirectional link) 390 MB/s, Full 781 MB/s GigE Vision 125 MB/s Dual 240 MB/s. 10GigE should be 1.25 GB/s Superior Reliability & Performance P. 5

Camera Interfaces Connection Type GigE 1394b USB CAMERA Link Point to point or LAN RJ-45 Peer to peer shared bus (4/6 pin) Master Slave shared bus (4 pin) Point to point link (MDR or SDR 26 pin)

6 Camera Interfaces Connection Type GigE 1394b USB CAMERA Link Point to point or LAN RJ-45 Peer to peer shared bus (4/6 pin) Master Slave shared bus (4 pin) Point to point link (MDR or SDR 26 pin) CoaXPress Point to point link BNC (75 ohm) or DIN 1.0/2.3 co-ax connector Distance 100 meter 5 meter 8 meter 15 meter 68 meters Performance 1 Gbps 10 GigE will be 10 Gbps 3200 Mbps USB Mbps USB Gbps USB Gbps Base 2.04 Gbps Full 6.8 Gbps 6.25 Gbps over single cable usually 4 cable interface 25 Gbps PC Interface GigE card or motherboard PCI card or Motherboard PCI card or Motherboard PCI or PCIe frame Grabber PCIe Frame grabber Superior Reliability & Performance P. 6

7 Sensor size Format Type Aspect Ratio Ø Dia. (mm) CCD/CMOS Sensor sizes* (mm) Diagonal mm Width mm Height mm 1/10" 4: /8" 4: /6" 4: /4" 4: /3.6" 4: /3.2" 4: /3" 4: /2.7" 4: /2.5" 4: /2.3" 4: /2" 4: /1.8" 4: /1.7" 4: /1.6" 4: /3" 4: " 4: /3" 4: " 3: mm Film 3:2 n/a Camera Tube CCD or CMOS Face view of a Camera Pick-Up Vacuum Tube Sensor, with a CCD superimposed on the imaging face, to illustrate the correlation of Imperial Format Types. Note: Typical sizes for camera tubes were: ½, 2/3 & 1 diameter. Superior Reliability & Performance P. 7

8 3D Machine Vision: Laser line triangulation In laser light section, profiles are determined by recording the surface structure with lines, enabling the user to determine a height profile along a projected laser line. When the beam direction and the distance between camera and laser are known, the height profile along the line on the object can be exactly calculated. By moving the measuring line continuously across the object, the object s surface structure can be determined with high precision. Measurement is determined by reference to an earlier calibration exercise with a known object placed within the optical set up. Superior Reliability & Performance P. 8

9 Resolution v Triangulation Angle Superior Reliability & Performance P. 9

10 3D Machine Vision In today s world of expanding 3D vision systems, the camera and laser are equal partners in the accuracy, stability and repeatability of the measurements made and used by the applications. The requirements on the laser for power, pointing and electrical stability are far above a typical illumination system requirements. Having a source which produces very high power density, very thin measurement cross sections with a uniform return that does not mask the profile of the object is critical to success in these demanding applications. Coherent s family of Machine Vision Lasers covers the broadest application, environment and technology space available today. 1mW to 8W, 1 line to 99 lines. Superior Reliability & Performance P. 10

$(Aspheric Line Generator) all refractive$ optic is an aspheric cylinder that

11 ALG: The Key Building Block The ALG (Aspheric Line Generator) all refractive optic is an aspheric cylinder that efficiently converts a Gaussian beam into a uniform laser line. Diode Laser ALG Collimating Optics Superior Reliability & Performance P. 11

12 Function Overview The StingRay platform is a ground up redesign of the popular SNF product, keeping only the form factor. This redesign incorporates state of the art electronics, optics and mechanics which provides a compact, highly flexible and reliable laser source that re-sets the standard in Machine Vision Microprocessor Controlled / Firmware upgradable in the field 5 to 24 Vdc Input Auto Ranging External calibrated photo feedback for power stability Highly stable translational external focus mechanism Robust thermal management, providing better stability and longer lifetime Hours counter Dramatically improved, repeatable, line performance Advanced Service Monitor to provide failure flag RS232 Communications to set and monitor laser parameters Common Universal Drive Electronics Dynamic Line Balancing Common footprint (514 to 830 nm all electrical configurations) Superior Reliability & Performance P. 12

Functional Overview Backward compatible form factor Multi

Focus Line Reference Designed for manufacturing Dynamic

management Improved optical performance Improved pointing

13 Functional Overview Backward compatible form factor Multi State LED Indicator 5-24 Vdc Input Auto Ranging External Focus Line Reference Designed for manufacturing Dynamic Line Balancing Improved electronics Better thermal management Improved optical performance Improved pointing stability Heat Sink Mount (Optional) Superior Reliability & Performance P. 13

14 Definitions Specification Standard Spec Description Definition Fan Angle / Line Length +/- 5% Length of Flat Top Profile As defined by the customer, taken at the 80% Clip Uniformity +/- 7.5% Intensity Variation of useable line Contained Power >95% Power contained within defined Flat Top Ratio of the power contained the in the line to the total power at 1/e2 Straightness 0.1% Max deviation from best fit line RI Floor >75% Minimum Intensity at any point along the FT profile FA < 45 degrees >60% Minimum Intensity at any point along the FT profile FA > 45 degrees Relative to the 100 intensity point in the profile Relative to the 100 intensity point in the profile Superior Reliability & Performance P. 14

15 Example StingRay Optics - 45 degree Standard Focus Example uniformity profile Note: Steepness of edges 100% of Line is used Efficiency of profile November Superior Reliability & Performance P. 15

16 Benefits of Uniformity Side by side comparison of competitors line and StingRay line A 50mW 660nm (Competitor) B 35mW 660nm (StingRay) Uniformity variations can be interpreted as features by the software Poor management of power density in the line, effect is need for more power to get the same SNR = Higher cost, Higher Safety classification A Comp. B - Stingray Single image capture with common threshold applied as reflected from the same surface Superior Reliability & Performance P. 16

17 Benefits of Uniformity Surface Plot difference Line A Plot Line B Plot - StingRay Superior Reliability & Performance P. 17

18 Benefits of Line Straightness Line Straightness limits the measurement window, know where you are measuring Measuring the profile of the item is the smallest slice possible, increases accuracy and repeatability of measurements A Comp. B - StingRay Superior Reliability & Performance P. 18

19 Structured Light Applications Weld Seam Glue Bead Gasket seals Soldier Paste BGA Wood Primary and Secondary processing Food portioning/sorting Packaging Tire Wall and Tread Wheel alignment Alignment guidance Bottle PCBA post assembly Rail car Rail track Road / Tunnel Rail Brakes Contour measurement Steel / Extrusion 3D Reconstruction Bin Picking Non Contact Surface Profile Superior Reliability & Performance P. 19

20 Any Questions? Alrad Instruments Ltd Turnpike Road Ind Estate Newbury Berkshire RG14 2NS Tele: Superior Reliability & Performance P. 20

UK Industrial Vision SWIR Challenges

UK Industrial Vision SWIR Challenges Ian Alderton ALRAD IMAGING ALRAD INSTRUMENTS LTD 1 ALRAD - Company Profile. ALRAD are a Distribution company for Imaging, Electro Optic, Analytical Components and Instruments