輝度計(モバイルタイプ) LMK mobile air

lmk-mobile-air-1b
luminance measuring imaging photometer

The application of high-quality digital cameras in the LMK-system allows an easy and fast capture of luminance images without depending on your measuring computer. For evaluating the images, the complete functionality of the LMK LabSoft software can also be utilized.

Technical data

Sensor

CMOS Canon APS-C imaging sensor

5184(H) x 3456(V)
2592(H) x 1728(V)
effective pixel (resolution of the luminance image)
14 Bit RAW data with Bayer structure, uncompressed

Dynamic range:
Single picture measurement (SinglePic)
[ 1:4000 (~60 dB) ]

High Dynamic measurement (AEB)
[ 1:32000 (1/1250 sec. < ti < 8 sec.) ]

Data interface:

USB 2.0 and/or SD/SDHC memory card

Focal Length / Visual field angle:
• Focal length 17mm: 65°(H) x 45°(V)
• Focal length 50mm: 28°(H) x 19°(V)

Selection of measuring range

Selecting aperture, exposure time and ISO speed

Metrological specification

Spectral matching

Numerical weighting of the RGB tristimulus values (multiplying matrices)

Calibration uncertainty

∆L [ 2.5% ]

Uniformity

∆L [ < 2% ]

Restrictions

  • Can not be used for measuring coloured light sources (i.e. LED)
  • Limited use for measuring modulated light source with a high depth of modulation

Result data

  • luminance distributions in measuring images L(x,y)
  • statistical data for being used in calculation programs (z.B. EXCEL®, MatLAB®, LabVIEW®)

lmk-3

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