LED ring array light source design and uniform illumination properties analysis

For requirements of light source on tiny parts measurement system, this paper puts forward a single wavelength LED to design uniform light of multiple ring. According to detection principle of tiny parts, the design method of ring source is set up, as well as luminescence radiation calculation model of LED ring source. The calculation model of light illumination properties of LED ring array light source are set up and analyzed, light illumination calculation functions of ring source are derived; based on design characteristics of ring source, illumination model and calculation principles of uniform light source are analyzed, the derivation process is established in detail. Through calculation and experimental analysis, illumination uniformity distribution curve of LED ring array light source were given under different detecting plane and the horizontal distance of LED, and the contrast results of illumination uniformity in the x axis and y axis also were given, the results show that when the distances between detecting plane and LED plane are 80 mm and 100 mm, illumination uniformity of LED ring array light source can reach 0.96.