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pmd time-of-flight and triangulation

The sensor works according to the triangulation principle. It projects a laser line onto the surface of the object to be measured. The pmd chip on the receiving element captures the reflected laser line.  The reflected light has a clear angular offset proportional to the height profile.

The measuring range is at a distance of 150 to 300 mm in front of the sensor. Due to the perspective of the receiving element, the length of the laser line depends on the distance from the sensor to the target object (the shorter the distance to the sensor, the shorter the line). But even if the distance between the sensor and the object changes, the proportions of the object are retained. Accordingly, the contour measurement is independent of the distance. This makes alignment and positioning of the sensor very easy.

Region of interest (ROI) adjustment

To determine very small deviations with the best reliability, limit the evaluation to the most relevant area. The ROI is the area between the two green marks on the laser line. This checks the exact position of the object when in fixed mode.  In floating ROI mode, the contour can vary along the line. Some applications require a second region of interest to analyze another area on the part. The OPD101 provides guidence and the ability to set two ROIs.

See what the sensor sees

ifm's Vision Assistant software provides a visual comparison of the test part and reference part. This allows targeted error analysis and troublshooting from your PC.

Click here to download the full free version.