lighting, aircraft, night vision imaging system - General Dynamics ...

MIL-STD-3009
x = 1931 C.I.E. relative spectral response of the eye
(color matching function)
y = 1931 C.I.E. relative spectral response of the eye
(color matching function)
z = 1931 C.I.E. relative spectral response of the eye
(color matching function)
X = C.I.E. tristimulus value
Y = C.I.E. tristimulus value
Z = C.I.E. tristimulus value
u’ = 1976 UCS chromaticity coordinate transformation of CIE x
v’ = 1976 UCS chromaticity coordinate transformation of CIE y
x = 1931 C.I.E. chromaticity coordinate
y = 1931 C.I.E. chromaticity coordinate
5.7.11.2 Secondary lighting chromaticity measurements.
For chromaticity measurements, the appropriate drive condition shall be applied to the
light being tested (test light) to illuminate a reflectance standard meeting the
requirements of APPENDIX A, to a luminance level of 0.343 cd/m 2 (0.1 fL) at a distance
of 12 inches. The test light shall be oriented perpendicular to the reflectance standard.
The spectroradiometer shall be set up such that the reflectance standard is at a 45°
angle with the line of sight of the spectroradiometer. The spectral radiance of the
reflectance standard shall be measured using an aperture that is as large as possible
within the projected area of the reflectance standard. The corrected spectral radiance
shall then be calculated using the following formula:
N (λ) =
Where:
M( λ)
r( λ)
N(λ) = corrected spectral radiance (W/cm 2 sr nm)
26
(Formula 12)
M(λ) = measured spectral radiance of the reflectance standard (W/cm 2 sr nm)