Laser distance sensors provide high-precision measurements of distance and position, with a resolution often below one micrometer. However, practical use can introduce issues affecting the repeatability of optical measurements. To address this challenge, Baumer has introduced OM70 laser distance sensors featuring selectable focus ranges, significantly improving local measurement consistency and ensuring greater reliability for automated tasks.

Repeat Accuracy on Challenging Surfaces

The resolution listed in a sensor’s datasheet is typically an accuracy specification that assumes the measuring point does not change position. Once lateral movement occurs, local repeatability becomes critical to measurement accuracy. This value almost always exceeds the resolution figure due to surface variations. The homogeneity of the target surface plays a key role here—different materials and structures introduce challenges in maintaining consistent measurements. Examples include high-contrast coatings, brushed metal surfaces, natural materials like wood or stone with color variations, etched PCBs, and more—all demanding optical precision from measurement systems.

Expanding Focus Ranges Boosts Reliability

The impact of surface heterogeneity on a sensor’s performance depends directly on the laser spot size reflected off the object. Smaller spots minimize errors caused by uneven surfaces. In laser sensors, light must be focused through lenses, meaning spot size varies across measurement ranges—the smallest occurs at the optical focus point. This is why measuring within an area centered around this focal point (the focus range) yields the most reliable results.

Application Diversity Demands Flexible Sensors

Different industrial applications require varying object sizes and installation scenarios—making sensor selection crucial for achieving repeatable accuracy. Baumer’s OM70 sensors are available in six distinct measurement ranges, from 70mm to 1500mm. Selectable focus ranges support specific ranges (e.g., 70mm, 140mm, etc.), enabling users to optimize reliability even under challenging surface conditions. For best results over the full range, sensors with extended focus ranges at their maximum measurement point should be chosen.

OM70: Precision Uncompromised

These high-performance Baumer distance sensors deliver exceptional accuracy (up to 0.7 µm resolution) and linearity (<0.06%) while maintaining ease of use in automated systems. They ensure stable performance despite temperature shifts or changing ambient light, measuring distances up to 1500mm with remarkable consistency.

Last Updated: 2025-09-04 23:23:19