Figure 2: Photoelectric sensor arrays can detect objects as small as 3 mm in a 55 mm high field. (Image source: SICK)
well as fast commissioning. When combined with a reflector, the photoelectric sensors also detect small, flat, transparent, or uneven objects as small as 3 mm. Within a 55 mm-high uniform light array, the sensors detect the leading edge of the object. This means that even perforated objects can be reliably detected without complex switching (Figure 4). Laser distance sensors Designers of applications like level monitoring in storage containers, position detection of objects on conveyors, XY position of the axis in automated forklift systems, vertical positioning of cranes in warehouses and overhead conveyors, and diameter monitoring during coil winding can turn to the DT50 Laser Distance Sensors. These sensors support time of flight (ToF) distance
measurements up to several meters using reflected laser light to provide immunity to ambient lighting, and precise and reliable operation. For example, the DT50-2B215252 has a range of 200 to 30,000 mm and several special features, including: ■ Rugged housing with an enclosure rating of IP65 and IP67 ■ Can provide up to 3,000 distance measurements per second ■ Minimum response time of 0.83 ms ■ Compact housing supports a range of applications from industrial robots to measuring fill heights of storage containers
High-res measurements using statistics High-definition distance measurement plus (HDDM+) is a high-resolution ToF measurement technology that can be used in laser distance and light detection and ranging (LiDAR) sensors. In contrast with single-pulse or phase correlation sensing technologies,
HDDM+ is a statistical measurement process.
The sensor software statistically evaluates the echoes of multiple laser pulses to filter out interference from sources like panes of glass, fog, rain, dust, snow, leaves, fences, and other objects to calculate the distance to the intended target. The resulting distance measurement can have a high level of certainty even under challenging ambient conditions (Figure 5).
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