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Long-range laser measurement systems

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article image The LD-LRS long-range laser measurement system.
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SICK’s LD-LRS long-range laser measurement system delivers rapid and precise measurement of the height of container stacks in ports or the detection of bulk materials in a ship's hold.

It can achieve ranges of up to 250m depending on the object's reflectivity properties.

The measurement data undergos application-specific conversion in a separate system processor and can be used for, among other things, determining positions, detecting obstacles, or controlling conveyor and loading or unloading systems.

The LD-LRS laser measurement system scans a stack of containers or a cone of bulk material without contact. Thanks to powerful laser optics it achieves ranges of up to 250m with high object reflectivity.

Values of low reflectivity are about 10%, with the range at 80m. This is sufficient to reliably and accurately detect, for example, dark containers or bulk materials in the hold of a ship from the crane jib.

In addition to a first digital signal processor (DSP) for controlling the measurement system, each LD-LRS has a second DSP via which the measured values determined are application-specifically converted and can be transmitted via Ethernet, RS 232 or RS 422.

The device is available in an IP 67 housing for outdoor use. The short-range blanking specially developed for this purpose ensures the front screen of the protective housing does not impair the function and accuracy of the measurement system within it.

One area of use is the automation of ship-to-shore cranes for loading and unloading container ships. Analyses have shown that the faster raising and lowering movements of the crane trolleys on jib cranes and the optimised container transport path, can result in time savings of up to 15 %.

The system features increased handling safety, as the measurement system installed on the jib often has a better view of the container than the crane operator.

The pivoting or travelling LD-LRS determines the width, height and length of a stack of containers. The measurement system calculates a 3-D image from the profile data and then the target positions to be approached for container uptake. At the same time, the measurement values serve to optimise the transport path of the crane trolley.

The LD-LRS can also precisely detect bulk materials in outdoor storage areas or in bunkers. The bulk material filling state is translated into a 3-D model. This makes material mounds or pits "visible" for the control of loading systems. Therefore removal can always take place where the most material is present.

Differing bulk material constituents, grain sizes, dampness, or compacting, nor fluctuating light conditions lead to any spurious measurements.

Numerous SICK laser measurement systems are employed for a variety of port automation tasks worldwide.

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