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Inline Dual Sensor – Automotive Gap & Flush Robotic Inspection

Measuring surfaces like automotive headlights, windows, and glossy white or black paint can be a challenge for traditional red line laser sensors. Red laser line sensors perform better on lower reflectivity or matte surfaces, particularly on fast-moving targets. However, for specular or shiny surfaces, the red light becomes distorted, resulting in a “speckle” effect.

In contrast, the shorter wavelength of the blue laser sensor produces much less speckling, resulting in lower noise levels, typically by a factor of two to three compared to red laser sensors.

Benefit from Multi-Sensor Networking

Buddied sensors are networked to automatically generate a single, high-accuracy 3D scan of the target. This dual multi-sensor network configuration also solves for any potential occlusions on the surface of the scan target. Scanning and inspection happen continuously and with no external PC processing or controller required, as the vehicle moves down the assembly line.

Using two networked blue laser sensors allows users to scan further into the gap, generating more complete and precise measurement data as a result. The process of combining and aligning multiple sensors is simple by using a built-in alignment procedure. With the combined 3D point cloud dataset, the user can easily apply the LMI gap and flush measurements onboard the sensor, in real-time.

Achieve High-Speed, High-Precision Measurement and Inspection

Depending on the surface quality, this system can capture up to 60 measurements points per minute taking 0.5 – 1 seconds per measurement point including evaluation. These scans are extremely detailed, measuring not only gap distance to the tenth of a millimeter, but also the shape, smoothness, and curvature of the surface.

With this data, many measurements including calculations and pass/fail decisions are made, allowing for a high level of quality assurance.

Out-of-the-Box, Robot-Compatible Gap & Flush Solution 

Every LMI smart sensor leaves the manufacturing floor after undergoing rigorous multi-step factory pre-calibration, assuring accurate measurements directly out-of-the-box. LMI sensors are compatible with most major robot brands including Universal Robots, Yaskawa, KUKA, Kawasaki, Fanuc, and ABB. Hand-eye calibration, which translates the sensor’s 3D data to the robot, is simple, and built-in to each sensor.

Using the LMI wide field of view 2490 Gocator sensor along with paired blue line 2440 Gocator sensors on a robot arm, LMI are able to provide a comprehensive in-line robotic vision solution for gap and flush inspection.

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