118
Apr-09
Avantes
www.avantes.com
6.1
Integrating spheres
The AvaSphere integrating sphere family can be delivered with an active diameter of 30, 50 or 80
mm (XX means the active diameter) and an SMA port at 90 degrees for both irradiance and reflection
measurements, the reflection sphere has an additional SMA- connector port at 8 degrees. Both
versions have a sample port diameter of 6 mm for the 30 mm diameter sphere, 10 mm for the 50
mm diameter sphere and 15 mm for the 80 mm diameter sphere. The irradiance version of the
integrating sphere can be used to measure light sources (Laser, LED, and Halogen Lamps). The
reflection version is used to measure reflective surfaces, as well as for color measurement and
fluorescence spectroscopy. A light source may be connected to SMA-connector port through a fiber
optic bundle to make the integrating sphere an ideal uniform light source. The integrating sphere is
made out of highly reflective diffuse material, its surface is reflecting the light diffuse with more
then 95% in the spectral range from 250-2500 nm.
Operating instructions for the irradiance spheres
1.
Connect an optical fiber between the SMA terminated measurement port of the sphere and the
spectrometer.
2.
Insert your emission source (Laser, LED, and Halogen Lamps, or light fiber) into the sphere
sample port .
3.
To collect diffuse radiation (light) from a 180° field of view, eliminating direct light collection
by the detection fiber a baffle is installed in the sphere.
4.
Measurements should be done in AvaSoft's relative or absolute irradiance mode, see the
appropriate documentation.
Operating instructions for the reflection spheres
Since the reflection sphere has 2 SMA ports, one under 8° and one under 90°, the sphere can be
connected for reflection measurements in 2 ways:
1.
Direct illumination, indirect measurement or
2.
Indirect illumination and direct measurement
We always recommend to use the first method of directly illuminating and indirect measurement.
This method has the advantage that the white light of the source directly illuminates the object.
The diffuse and specular reflection is indirectly measured by the sample port. In the second method
the illumination is indirect and therefore the object surface becomes a part of the sphere, so the
illumination of the object is actually not white light anymore, depending on the color of the object.
Such method requires a second spectrometer channel to measure the illumination in the sphere.
The operating instructions refer to the first method of direct illumination and indirect measurement:
