01How volumetric scanning works
The vision unit observes the shipment and reconstructs its shape in three dimensions. Software then fits the smallest bounding box — the length, width and height of the space the shipment actually occupies — and volume and dimensional weight follow arithmetically. Because the capture is optical, the object is not contacted, squared up or rotated: a carton with a crushed corner is scanned as the shape it is, and a pallet with overhang is scanned with its overhang, which is precisely the volume a carrier's equipment will report.
The scan is one element of the record. In Goodscan machines it is captured together with weight (from the static table or the in-motion weighing section) and identity (from the barcode read), producing the DWS record. Volumetric scanning describes the dimensioning element of that trio — which is why 'volumetric scanner' and 'dimensioner' so often name the same machine from different angles.
02Vision vs light curtain vs tape
Three sensing approaches measure freight today. Tape measures are manual, slow, and systematically optimistic — they find the longest carton, not the load's true envelope. Light-curtain arrays profile a moving object from interrupted beams: fast and robust for regular cartons, which is why the GM210Pro uses one. 3D vision reconstructs actual shape, handling irregular, soft-profile and non-cuboid items, and it is the sensing across most of the Goodscan range — static workstations, the GS210M dynamic machine, the GS300 pallet rigs and the GS400 truck system.
The practical selection follows the freight, as the dynamic DWS page sets out: uniform carton streams can run light curtain; mixed real-world streams belong on vision. Either way the output record is the same shape — the sensing is an engineering choice, not a data compromise.
03Where volumetric scanning is bought
Buyers meet the term in specifications and RFPs ('volumetric scanner for inbound freight verification'), in 3PL tenders, and in carrier equipment programmes. If your specification says volumetric scanner, the Goodscan answer is the DWS model matched to your freight and flow — start from the dimensioner range map, or send the specification itself with your inquiry and we will map it to the model and configuration that satisfies it.