Data acquisition
wide laser line onto the target surface, which is viewed by the CMOS receiver array and converted into a 2D profile line of x and z coordinates. The 3D information is built up from a sequence of captured profiles which makes it especially useful for capturing data from targets that are continually moving and not able to stop. The scanCONTROL 3000 series are compatible with 3D measurement and inspection and are offered with a number of different measuring ranges which govern the line width of the sensors.
WHICH SENSOR FOR WHICH SURFACE?
The choice of sensor model depends on whether the surface to be measured is diffuse or specular reflective. With matt or diffuse surfaces, the light that hits the surface will reflect in all directions. This means the light can be viewed from a range of different angles. When the surface is shiny or specular reflective like a mirror, the light will reflect at the same angle off the surface, which means you must be at the exact same angle as the reflection in order to see the returned light. surfaceCONTROL and scanCONTROL
work best on matt or diffusely reflecting surfaces, i.e. those that do not present a perfect mirror. For particularly shiny and flat surfaces, the reflectCONTROL is ideal. Both surfaceCONTROL and reflectCONTROL require the target to be stationary for a moment in order to capture the 3D data. However, scanCONTROL sensors need the target to be moving in order to capture the data or have the sensor moved over the target.
INTEGRATION METHODS For control of the 3D measurement, two integration methods are suitable depending on the customer’s configuration in their setup. The sensors can be triggered directly to start acquisition from a line PLC or via the host PC running the analysis software.
OBTAINING DATA When processing large amounts of 3D data, it is important to consider how this data and the resulting measurement information is transferred to the control system. Micro- Epsilon 3D sensors communicate using the standard GenICam and GigE Vision protocols. Once the data is processed in the PC, it must then be transferred to the control system, which today, is often achieved using an Industrial Network such as Profinet, Ethernet I/P or EtherCAT. Micro-Epsilon offers the Industrial Performance Unit (IPU), an industrial PC (IPC) configured specifically to run its sensors and software, as well as incorporating the necessary gateway architecture to communicate with Industrial Networks.
Micro-Epsilon
www.micro-epsilon.co.uk Instrumentation Monthly September 2022
software tool, 3DInspect, which enables 3D data capture and evaluation. The software is compatible with all 3D sensors in the Micro- Epsilon portfolio, including surfaceCONTROL for geometry, shape and surface inspection of matt objects; reflectCONTROL for measurement of shiny, reflective surfaces, and scanCONTROL sensors laser scanners for precise, inline 3D measurements. 3DInspect is designed for ease while
M
offering a wide range of functions for analysing and measuring captured data. These include parameter setting of the sensors, alignment of point clouds and the selection of relevant objects, filters for smoothing and optimising point clouds, as well as calculation programs for height, radius and determining flatness and distances between points and angles. The software is able to find a target based on its contour and readjust it to allow further inspection to be made. The 3DInspect software concept offers four steps to obtaining results:
Data acquisition – ensuring that the sensor and the target are correctly aligned aided by the ‘Display Image’ data. The data is then captured and processed into the software.
Data pre-processing – realigning of the captured data so that it is in line with the XYZ coordinate system.
Evaluation – the data can now be evaluated and various processes can be set up to inspect.
Transfer of data – the data can now be output from the software. This can be done in a number of different ways depending on the user’s configuration and set up. Available output formats are UDP, TCP and Modbus, where 3DInspect acts as the server. With additional modules, control and measured value output are also possible via Profinet and Ethernet/IP.
In addition to the standard version of 3DInspect, the ‘Automation’ function extension supports automated production processes. Video tutorials explain the software application and its features. As the software is constantly being developed, it is always up to date and every new release offers further useful functions. A comprehensive SDK is available for third party and custom image processing solutions. This is based on the GigE Vision and GenICam industry standards, including numerous function blocks.
Micro-Epsilon
www.micro-epsilon.co.uk
65
3D DATA CAPTURE AND EVALUATION
icro-Epsilon has developed a new powerful
Glenn Wedgbrow, business development manager at Micro-Epsilon UK comments: “For those system integrators with their own 3D processing software such as HALCON or similar, we offer our documented 3D Software Development Kit [SDK] with examples for various programming languages , so that they can create their own solutions to applications. For end users who do not have the capability to write their own software code, we offer the 3DInspect software solution.”
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82
