The PM-GONI system from Radiant Imaging (Duvall, WA) enables luminous intensity distribution and color measurements for various illumination products, including wide-beam-angle luminaires such as automotive headlamps and taillights, architectural lighting, traffic signals, aircraft lighting, and runway lighting. The system mates a CCD-based photometer and a two-axis goniometer with system control, data acquisition, and image processing software.
The system allows light source output over a hemisphere to be measured at any distance using a screen image. This is accomplished by using the goniometer to rotate the source through the measurement range and acquiring separate images of the illuminance distribution at various angles. These images are then combined into a single image of the entire output distribution. The system can control either the company’s goniometer system or a customer-supplied goniometer. System software automatically displays data in a variety of formats, including radar and contour plots, and exports data as Type-B or Type-C IES files.