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Summary of Contents for Cognex In-Sight 3800L
- Page 1 In-Sight 3800L Installation Guide 3/18/2025 v1.0 In-Sight 3800L Installation Guide 3/18/2025 | v1.0 P a g e | 1...
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Page 2: Table Of Contents
CONTENTS ..............................ii Introduction ............................1 Line-Scan Vision-System Basics ....................... 2 Applications for In-Sight Line-scan systems..................4 In-Sight 3800L Specs .......................... 6 4.1 Raw Specs ........................... 6 4.2 Example Scenario ........................6 Lensing Options ..........................7 Lighting Options ..........................9 6.1 IO Module ............................ -
Page 3: Introduction
This document is a practical guide for setting up a line-scan system as well as go over the specifics and setup of the In-Sight 3800L for use in your vision solution. -
Page 4: Line-Scan Vision-System Basics
Line-scan systems accomplish this by having very few rows of pixels (mostly one) in the sensor to read in each line. These lines are read from very quickly resulting in a far greater acquisition speed compared to an area scan. In-Sight 3800L Installation Guide v1.0 3/18/2025... - Page 5 To accurately track the part, encoders are needed to handle variances in part speed as slight changes in speed can drastically affect the image formation if no encoder is used. In-Sight 3800L Installation Guide v1.0 3/18/2025...
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Page 6: Applications For In-Sight Line-Scan Systems
Because line scans take only a sliver of an image at a time, cylindrical parts can appear flat and easier to inspect without appearing distorted due to the shape of the object. Inspections for can labels, bottles, gears, tires, and other round objects can make for good candidates. In-Sight 3800L Installation Guide v1.0 3/18/2025... - Page 7 Continuous material applications like electrode sheets, carpet, linen, and other continuous web-based applications are good candidates for line-scan systems. With overlapping ability in the In-Sight 3800L, you can ensure that defects are always able to fully present when they might be in between image slices.
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Page 8: In-Sight 3800L Specs
400mm working distance. The speed of the system is 650ft/min. Using this as our design criteria, the following sections will go through choosing the proper components and system settings for our line-scan system using the In-Sight 3800L. In-Sight 3800L Installation Guide v1.0... -
Page 9: Lensing Options
Lensing Options 5 Lensing Options The In-Sight 3800L has a 1 in. C-Mount only sensor size and lensing options chosen should be of the same type to avoid distortions. Since the width of the line scan sensor is the gating factor in the field of view, determine the appropriate lens size using the below equation. - Page 10 Lensing Options Below are some recommended Moritex lenses that are paired to work with the In-Sight 3800L camera. Lens Part Number 6mm SR Series ML-U0618SR-18C 12mm SR Series ML-U1217SR-18C 16mm SR Series ML-U1615SR-18C 25mm SR Series ML-U2515SR-18C 35mm SR Series...
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Page 11: Lighting Options
Lighting Options 6 Lighting Options Because the In-Sight 3800L line-scan imager is a single row of pixels, only a single line of light is needed. This not only minimizes the space needed to illuminate the part but also means the entire part does not need to be uniformly illuminated –... -
Page 12: Triggering Options
Triggering the system is very similar to any traditional In-Sight system. The big difference is that the encoder is also used to make sure the line-by-line acquisition takes place. The In-Sight 3800L has the following options when it comes to triggering. -
Page 13: Clipping Modes
Clipping Modes 8 Clipping Modes The In-Sight 3800L has ways of handling what happens if a new trigger is issued to the camera before the full image was finished building. Overlap In Overlap mode, if the trigger for the next image comes in before the current one is finished being acquired, the remaining portion from the previous image from the last acquisition will be appended to the current image. - Page 14 In No Clipping mode, any triggers received before the image isn’t built will be ignored. This is shown with the diagram below where two out of the four triggers are ignored because the image was still being built when they arrived resulting in two full images opposed to four images. In-Sight 3800L Installation Guide v1.0 3/18/2025...
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Page 15: Encoder
Hardware Encoder The In-Sight 3800L has two hardware encoder lines. These support a single channel (one input) and quadrature (two inputs) options. Depending on the encoder type, the pulse inputs can be interpreted for half or quarter increments. - Page 16 When using the software encoder on the In-Sight 3800L, you can set the time period within the acquisition settings anywhere from 1 µs – 1000 µs. This parameter can be changed between acquisitions if needed.
- Page 17 4. For example: An encoder gives quadrature outputs capable of 16,000 cycles per full revolution. If In-Sight acquires 1 line per revolution, this value in steps per line for In-Sight 3800L is 4000 (or 16000 cycles divided 4) because In-Sight counts each transition as fractions. As a result, In-Sight will count each transition (1, 1.25,1.50,1.75,2, 2.25, etc.) until the value of 4000 is reached.
- Page 18 ���������� ������ �������� 2.730 12 ���� 1 ���������� �������� 25.4 ���� �������� 16,000 ������������ 1 �������� 0.052 ���� 1 ���� ���������� ���������� ������ �������� 2.730 2.75 12 ���� 1 ���������� �������� 25.4 ���� �������� In-Sight 3800L Installation Guide v1.0 3/18/2025 Page 16...
- Page 19 12 ���� 1 ���� 60�� Given that this is well below the frequency of the max frequency of the In-Sight 3800L, we know that at this line speed, we will not overrun the input to the camera. In-Sight 3800L Installation Guide v1.0...
- Page 20 1 ���� µ The In-Sight 3800L has a max line rate with exposure time at 4k resolution of 84kHz (11.9 µs). Given that we have 63.5 kHz (15.74 µs) at our current rate, we are in a safe range. Exposure In the previous examples, we calculated the rate that we can acquire a new line.
- Page 21 Consider your smallest pixel sizing needed to conduct the inspection. In many cases, you do not need to use the full resolution capabilities of the In-Sight 3800L and can select a smaller resolution such as the 2K mode. In this mode, your max line rate is about double that of the 4K and 1K modes.
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Page 22: Troubleshooting Line Scan
Below are some typical issues you might encounter when using a line-scan system such as the ISIn- Sight 3800L. Description Acquired Image IMAGE Correct Image IMAGE MAGE I Scrolling/Moving part in FOV AGE IM IMAGE Stretched IMAGE Compressed IMAGE IMAGE Repeated Part in single image IMAGE IMAG Truncated In-Sight 3800L Installation Guide v1.0 3/18/2025 Page 20... - Page 23 Adjust the acquisition trigger or the number of total lines in the image to compensate. A truncated image could be seen when Line Clip mode is set to Reduced Line Height. If this is the case, the truncated image is expected. In-Sight 3800L Installation Guide v1.0 3/18/2025...
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Page 24: Appendix A System Alignment Techniques
While checking your image previews, start to see if you can get a series of vertical bars to appear in your image. These vertical bars will represent the horizontal positions of the dots that are printed on your alignment sheet. In-Sight 3800L Installation Guide v1.0 3/18/2025... - Page 25 If your image has the correct alignment and the image is evenly illuminated, secure your system in place so that any focus adjustments that need to be made do not affect your positioning. In-Sight 3800L Installation Guide v1.0 3/18/2025...
- Page 26 Appendix A System Alignment Techniques In-Sight 3800L Installation Guide v1.0 3/18/2025 Page A-3...
- Page 27 AND falling edges 2 ���������� are counted and if the encoder is a ������������������ ������ 1 �������� single channel type. In-Sight 3800L Installation Guide v1.0 3/18/2025 Page A-4...
- Page 28 µs) to frequency. 1000 ���� 1000 �� �������� ������������ �������� ������������ 1 µ�� 1 ���� µ Use this to determine the max exposure time possible without missing ���������������� �������� ������������ 0.5 µ�� acquisitions. In-Sight 3800L Installation Guide v1.0 3/18/2025 Page A-5...
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