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Laser distance sensors for crane positioning and container handling

A crane is a positioning problem in bad weather: steel, salt, fog and a trolley that does not stop when the reading jumps. The sensor has to be boringly repeatable, not impressive.

What the application actually needs

Container handling and crane anti-sway work in the 20–300 m band, usually against a target that is large but poorly cooperative: painted steel, wet surfaces, and a trolley that is itself moving. What matters is repeatability at that distance, not maximum range. A module that reads 200 m on a 0.3×0.3 m target every time is worth more than one that reaches 2 km once.

Reflectance is the number that bites

Steel containers sit around 30–60 % reflectance when painted, and drop hard when wet or rusted. Check the low-reflectance column of the specification table, not the headline range, and check it against the target size you actually have rather than a 6 × 6 m board.

Interface and cycle time

Crane control loops run at 10–100 Hz and usually expect a discrete trigger and a serial frame. UART-TTL at 3.3 V is the common choice; RS-422 where the cable run is long and the VFD noise is real. Ask for the frame timing before you design the loop, because a module that answers in 200 ms changes your control design more than one that answers in 20 ms.

Environmental case

905 nm is fine in clear air and cheap; fog and heavy rain favour 1535 nm for the same range class. IP rating is not in the module — it is in your housing. Plan the window heater and the desiccant before the mechanical design freezes.

Modules that fit this application

Shortlist is a starting point, not a recommendation — the right module depends on target, visibility and pointing error. Filter the full matrix.