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The NVIS compatibility of a display involves its NVIS radiance (NR), color, luminance, and contrast. Production testing methods for color, luminance, and contrast have long been standardized in the aerospace industry. Korry’s lighting inspection group is equipped with spectroradiometers and photometers to quickly and accurately measure these lighting characteristics.
Production testing of radiance, however, is a new necessity brought about by NVIS, and has become the central issue in verifying NVIS compatibility. Korry’s early involvement with NVIS technology means we have years of experience in production testing of NR.
Spectroradiometry
To calculate NR for a display, MIL-L-85762A requires measurements from 450 to 930 nm with a spectroradiometer. Korry uses several Instrument Systems Spectro 320 spectroradiometers to perform NR testing in full compliance with MIL-L-85762A.
A spectroradiometer splits the light emitted by the tested source into its constituent wavelengths, much like a prism spreads daylight into a rainbow of color. In turn it focuses each narrow band of wavelengths onto a high-sensitivity photodetector, which converts radiant energy into an electrical signal. The spectroradiometer’s computer stores these measurement signals and calibration data in memory, calculates absolute radiance, then derives NR, luminance, and color coordinate values.
Our Spectro 320 spectroradiometers can test lighted legends in several minutes and allow us to provide in a cost-effective way the same level of verification for production parts as for qualification or first-article testing.
Korry uses state-of-the-art spectroradiometers from Instrument Systems to provide first-article, qualification, and production testing of NVIS radiance in compliance with MIL-L-85762A.
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