Optical measurement of the head-on wind section of automotive models

In a car wind tunnel test, we need to know the exact wind profile of a car model to calculate wind load. An optical telescopic image system with scattering illumination is developed to measure the area. The system can perform a measurement with ±1‰ accuracy, large than 1×1 square meter optical field, and with more than 1.5 m depth of field. The developed system also possesses the features: non-contact, compact size, easy adjustment, and high speed.