LDV

LDV is an acronym that can refer to several different concepts in transportation, industry, and science. The three most common meanings are light-duty vehicle, a van brand, and a velocity measurement technique known as Laser Doppler Velocimetry.

Light-duty vehicle: In automotive regulation and industry, light-duty vehicles are passenger cars, SUVs, vans, and light trucks that are designed for everyday road use and have a lower weight and gross vehicle weight rating than heavy-duty vehicles. LDVs are the principal category for fuel economy standards, emissions regulation, and vehicle classification in many markets.

LDV brand: LDV Limited began as a UK van manufacturer under Leyland, later known as LDV; in 2009 the brand assets were acquired by SAIC Motor and the LDV marque has since been used in various markets, especially Australia and parts of Asia, with a lineup including vans and light commercial vehicles.

Laser Doppler Velocimetry: LDV is a non-contact optical method for measuring velocity of particles in a fluid flow. Two coherent laser beams intersect to form a fringe pattern; particles crossing fringes scatter light with a Doppler shift proportional to velocity along the measuring axis. The technique is non-intrusive and provides high temporal resolution, widely used in aerodynamics, combustion, and fluid mechanics. Variants include Laser Doppler Anemometry, and combinations with particle tracking.