The SIG-400 (Source Imaging Goniometer, Gen. 4) is a fully automated, computer-controlled goniometric system designed specifically to meet the needs of LED researchers, developers, manufacturers, and users for LED die and device characterization. The SIG-400 uses a PM-1600F Series™ Imaging Colorimeter or photometer to generate highly accurate near-field models for LEDs; this data can be used directly to investigate the performance of the LED or it can be exported, via Radiant’s ProSource™ Software, for use in all major optical design software packages.

Efficiency and cost savings by focusing on LED measurement needs

The SIG-400 is Radiant Imaging’s 4th generation of Source Imaging Goniometer and the realization of over 15 years of experience in light source measurement. By merging Radiant’s latest advances in imaging colorimetry, robust mechanical design (to provide industry leading accuracy), and easy-to-use control software, the SIG-400 can be readily applied to a broad range of measurement applications. And by focusing on the needs of LED measurement, the SIG-400 is very cost effective.

The SIG-400 captures and aggregates images and flux measurements from thousands of angular viewpoints around a light source to precisely characterize the source’s near-field output. The SIG-400 supports measurement of vertically oriented light sources and can be ordered with both microscope and extended field of view optics, thus providing the flexibility to measure both LEDs and other light sources.

A complete turnkey system for generating accurate input for optical design

The SIG-400 system consists of a ProMetric™ Imaging Colorimeter, a goniometric assembly for positioning the imaging colorimeter and the light source relative to each other, and SIG1.0 control and analysis software. The SIG-400 captures images of the light source from multiple angles, building a 3 dimensional spatial image of the color and luminance output of the device. These measurements are aggregated into a Radiant Source Model™ format, which is a detailed, industry standard model for light source near-field data representation. RSMs contain all of the measurement information, including the image data, so the measurement results can be review in detail at any time. RSMs are used to compare the optical properties and design of various LEDs and to generate input to optical design software for use in luminaire and optical system design.

Applying Radiant’s ProSource® Software to the RSM, ray sets containing an arbitrary number of rays can be generated for export to other optical and illumination system design software package such as ASAP, FRED, LightTools, LucidShape, Opticad, OSLO, SimuLux, SPEOS, TracePro, and Zemax, as well as general file formats. Because the RSM is a complete description of the light source, it can be used to generate and regenerate ray sets at will — smaller numbers of rays for rough design and a large number of rays for final design — making the overall design process more efficient.