08/02/2006 - DUVALL, Wash.,Imaging system maker Radiant Imaging's new IS-LI is the first system to enable rapid, comprehensive measurement of the luminous intensity of LEDs and other small light sources. Based on patented integrating sphere technology, the IS-LI acquires luminous intensity (brightness as a function of angle) data in seconds -- or less -- over an entire 2 steradian in a single measurement.

Imaging sphere main functionnal elements

Imaging sphere operation

The system delivers up to 16-bit luminance measurements, with an angular resolution of 1 percent or better. Alternately, the IS-LI can analyze color versus emission angle, a particularly important performance metric for white light LEDs. Previously, obtaining these precision measurements required goniometric tools, but with no moving parts, the new IS-LI is orders of magnitude faster than traditional methods, and is also substantially more economical, the company said. This combination of high precision, high resolution and speed enables real-time, production-line quality control of LEDs for the first time, and makes the IS-LI ideal for research and development purposes as well.

Luminous intensity plot

The IS-LI system consists of a 20-in. (550 mm) diameter, hemispherical measurement chamber, mated with a CCD-based imaging photometer or colorimeter. The latter is selected from Radiant Imaging's product line, which includes 10-, 12-, 14- and 16-bit dynamic range models, at several different spatial resolutions. System software supports automated and/or customized measurements, as well as data analysis and display functions. Data can be displayed as isometric plots, cross-sectional graphs, radar plots, bit maps and color graphs.

For more information, visit: www.radiantimaging.com; e-mail: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

See datasheet and more information about this product here.