GON 360 - Goniometer for specular transmission and reflection measurements

Spectral transmission and reflection measurements at any desired angle can be carried out with the GON 360 goniometer. Angles for illumination and measurement can be set independently. Optical fibers are used for connecting the measurement optics with the spectrometer, and the light source with the illumination optics. Models from the LS100 / LS500 series can be used as light sources.


  • manual and motorized versions
  • measurement angles adjustable over a full 360°
  • independent angle settings for illumination and measurement optics
  • digital angle display with 0.1° accuracy and 0.01° resolution
  • large selection of holders and stages for the test sample
  • optional polarizers and viewing optics

Various adjustable stages are available for proper positioning of the test sample in the GON 360 - linear translation stages as well as stages for adjusting height, inclination and rotation. In combination with the independently variable angles for illumination and measurement, the GON 360 lends itself to measurement of any type of test sample. The exact positioning of the measurement spot on the sample can be verified with the optional viewing optics.

A small integrating sphere is available as alternative measurement optics for samples with curved surfaces and/or irregular structure, including for example polycrystalline solar cells. This option also allows reflection measurements to be carried out without a reference mirror.

The digital angle display, with an accuracy of ± 0.1° and a resolution of ± 0.01°, allows precise measurements to be made even with the manual version. Alternatively, the GON 360 is available with stepper motors for automation of measurements (e.g. for multiple angle measurements of metallic and pearlescent coatings and paints).

Technical details for the GON 360


Spectral range



190 to 2500 nm

With achromats (GON360-101)

380 to 780 nm

Illumination optics


Adjustment range of illumination angle


Adjustment accuracy


Adjustment resolution (max.)

± 0.01°

Diameter of the illuminated area for OFG-414 and normal incidence with standard aperture

10 mm

Divergence of the illumination beam


Diameter of the illuminated area for optional GON360-102 and OFG-312/322

2 mm

Measurement optics


Adjustment range of measurement angle


Smallest measurement angle in reflection

Adjustment accuracy


Adjustment resolution

± 0.01°

Crystal polarizers (optional for illumination and measurement optics)


Extinction ratio

< 10E-5

Adjustment range


Reproducibility for 0°, 45° & 90° positions

± 0.5°

Wavelength range 300 to 2500 nm

320 to 2300 nm;



Height x width x depth [mm³]

approx. 340 x 310 x 580


approx. 18 kg

Operating temperature range

+ 10°C to +40°C

Relative humidity

< 70 %

Power supply

230 V ± 10 %, 50 Hz;
110 V ± 10 %, 60 Hz

Power consumption

approx. 12.5 W