Comprehensive viewing angle performance characterization for large light sources
PM-NFMS™ (ProMetric® Near-Field Measurement System) measures brightness, color, and, optionally, spectrum as a function of viewing angle for large light sources. It is designed to provide accurate luminance distribution data for developers of large light sources for automotive, transportation, architectural, and other applications. Because PM-NFMS captures a complete near-field model of the light source, it provides much more comprehensive information – in a much smaller measurement space – than can be obtained from traditional spot meter-based measurements.
Generate illumination distribution data in multiple standard formats
By processing the measured data, PM-NFMS can output IES format files, EULUMDAT files, illuminance distribution on a plane as table, and Radiant Source Model™ (RSM) files. RSM files can be used to generate either photopic, colorimetric, or spectral ray sets for use in optical design tools by using ProSource® Software.
Complete, automated system for large light source measurement and analysis
The PM-NFMS system consists of a ProMetric Imaging Colorimeter, a two-axis goniometer for precisely adjusting the display's angular position relative to the imaging colorimeter, and PM-NFMS software that controls both the imaging colorimeter and the goniometer during the measurement sequence. The PM-NFMS software also includes a comprehensive set of data analysis tools.
The PM-NFMS control and analysis software automates the measurement functions of both the ProMetric Imaging Colorimeter and the NFMS goniometer, allowing definition and execution of a complete measurement sequence with minimal effort. The measurement data is preserved as a set of display images, capturing an image of the light at each viewing angle as a Radiant Source Model (RSM). The RSM can be analyzed directly to understand light source performance, or Radiant's ProSource software can be used to convert the RSM to a ray set for use in other optical and illumination system design software packages such as ASAP®, FRED®, LightTools®, LucidShape®, Opticad®, OSLO®, SimuLux®, SPEOS®, TracePro®, and Zemax, as well as general file formats.
Extensive analysis functions for complete viewing angle performance and extrapolation as illumination distribution
The PM-NFMS system software supports light source performance analysis through an extensive variety of quantitative analyses, including isoplots, CIE color analyses, and radar plots. In addition, PM-NFMS software can be used to extrapolate a far-field illumination distribution from the measured near-field RSM. Because the illumination distribution is derived from the near-field data, the space required to perform these measurements is substantially reduced as compared to spot meter-based methods (where the measurement instrument must be place in the far field). The spot meter is also not capable of providing near-field data.
Multiple hardware configuration options to fit any application
Any ProMetric Imaging Colorimeter can be selected for use with the PM-NFMS system; the ideal selection will be a function of the dynamic range, measurement resolution, and field-of-view required for a given application. The PM-NFMS goniometer is available in several sizes to support varying light source sizes, ranging from headlamps to architectural lighting systems.