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PM-NFMS™ (ProMetric® Near-Field Measurement System)

By: Radiant Vision Systems

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.

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. The RSM files can be used to generate either photopic, colorimetric or spectral ray sets for use in optical design tools by using ProSource® Software.

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 leading optical design software packages.

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