specbos 2501 can be used for reflexion measurements, if an illumination source and a set up realizing the appropriate measuring geometry will be added. In addition, the accessories add-on optics and integrating sphere are required.

An example is the measurement of display reflexion, as described e.g. in the Information Display Measurements standard¹.

An integrating sphere with lamp(s) illuminating its interior is used to create a homogenious and diffuse illumination of the display, which is mounted in the centre of the sphere. The measurement can be done with specular reflex uncluded or excluded. The angle θ_d is normally 8°.

Display reflexion measurement with specular reflex included

The following measurements are performed with switched on display:

• Measurement of the display Luminance when illuminated by the sphere illumination (L_Qon)
• Measurement of the reflectance standard Luminance when illuminated by the sphere illumination (L_stdQon)
• Measurement of the reflectance standard Luminance without sphere illumination (L_stdQQoff)
• Measurement of the display Luminance when sphere illumination is off (L_Qoff)

The resulting reflectance ρ_8/di (specular reflex included) and ρ8/di (specular reflex included) will be calculated as follows:

Recommended product and accessories

specbos 2501   add-on optics   special integrating sphere