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For best operation and reliability, follow the guidelines explained below and in our published operating instructions. Ideally, mount the sensor vertically to the target object. 

Tip: Use the Vision Assistant configuration software to see the profile in real time and monitor the results of angle changes.

Lateral inclination

When aligning the sensor laterally, ensure the laser line hits all surfaces of interest. Vertical edges can obscure the laser; therefore, the profile cannot be inspected in that area. If necessary, reduce the inclination angle.

Front or back inclination

In addition to the time-of-flight principle, the pmd Profiler also uses triangulated light from the transmitter to the receiver to determine the target’s profile. The line-of-sight between the reflected light and the receiver cannot be interrupted. In this case, reduce the inclination angle or rotated the sensor by 180 °.

Multiple reflections

When the object surface is irregular, multiple reflections to the receiver can cause erratic measurements. Ensure the light path from the target to the receiver is clear. Alter the sensor position (angle, distance, etc.) until the readings are consistent.

Saturation and signal loss

The sensor automatically adjusts its exposure time to avoid saturation. Highly reflective targets can create “hot spots” of individual points within the ROI where the object is not detected. Avoid this signal loss by altering the sensor position (angle, distance, etc.).