BSDF Goniophotometer

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Measuring the reflection properties of materials

BSDF-goniometer (Bidirectional Scattering Distribution Function) is a goniometer for analyzing the scattering of light  on surfaces of materials. The instrument measures the reflection (BRDF) and transmittance (BTDF) in various angles and various wavelengths.

The goniometer has three rotators: the detector is rotated around two axes (azimuth and elevation), and the light source around one axis (elevation), the sample being hold steady. The measurement results a 3-dimensional array in BSDF file format that can be used with simulation tools such as Zemax, Speos and LightTools.

• A goniometrical assembly motorized from -90° to +90° (two axes for azimuth and elevation angles) for detector
• Measurement time of one azimuth plane:

▪ 10s @ elevation angle step 0.1°
▪ 7s @ elevation angle step 0.2°

• SSL MC-200-BT 3-axis stepper motor controller
• Android based remote control for motion control MC-200-BT
• Dark cabinet (1.1 m x 1.0 m x 2.0 m) with 19" rack 10U free pos.
• SSL BSDF software

▪ BSDF file format compatible with Zemax, Speos, LightTools.

LC.800.1 photocurrent meter
▪ LH1010 Silicon photodetector.
▪ Detection range 300-1050nm
▪ Aluminum fiber reflecting collimator for collection optic.
▪ Optical Fiber, 2m, 300-1200nm.
Reflectance standard, 1pc
▪ BaSO4 coated reflectance standard
▪ Lambertian angular reflectance with R>95%
▪ Reflectance area: Diameter 34mm
▪ Cover cap included.
▪ Reference calibration included.

Different illumination angle settable up to 70°
▪ goniometrical assembly motorized from 0° to ±90°
for light source
▪ Standard set of Light source of type
SSL LS MH-42.LED1_xxx_A_NN:
▪ Optical fiber input collimator optics
▪ Neutral white LED, Ra 84, CCT 4000K
▪ Single color LEDs peaked at 405 nm, 454nm,
530nm, 625nm, 660nm, 720nm, 850 nm, 950nm.
▪ Manually exchangeable light source.
▪ Spot size Ø10 mm
▪ Dead angle ~2.2° in reflectance measurements.