Analysis of light-scattering samples
Integrating sphere
SPECORD S600 accessories Edition 09/2014 85
20 Integrating sphere
The integrating sphere is used for the measurement of light-scattering solid or
liquid samples in transmittance or reflectance.
The complete integrating sphere unit for the SPECORD S600 consists of the
75-mm sphere body, which contains a quartz halogen lamp, a quartz lens with
mount, a control unit with shutter, a transformer for the supply of 5V and 24V
low-voltage for the lamp and the control unit, and the power cable with switch.
The sphere body consists of two Spectralon hemispheres with apertures for the
lamp, the beam exit, the beam reflecting mirror and holders for samples and
cells for transmittance and reflectance measurements.
The integrating sphere is inserted together with the control unit into the optical
path of the SPECORD S600 sample compartment. For loading powdery
samples, it may be removed from the sample compartment and be reproducibly
reinserted.
Caution! Sensitive optical instrument
The integrating sphere with its open mirrors and the highly reflective
Spectralon components is a very sensitive optical instrument. Especially
when handling powdered samples it must be carefully avoided for powder
particles or other contamination to enter the spherical body. A change of the
reflectance of the Spectralon from 99 % to 98 % reduces the efficiency of the
integrating sphere to half. The Spectralon inserts and gloss trap must also be
handled with the same care, because changes in the reflectance of those
components also reduce the efficiency.
Unpacking and storage
• Remove the spherical body carefully from the transport and storage
container without touching the mirrors.
• Only touch the spherical body from the side panels.
• If you are not working with the integrating sphere, store it with all its
accessories in the corresponding container. The mirrors feature a SiO
2
protective coating, but they should be protected against contamination.
• You should also remove the reflector from the SPECORD S600 when not
working with the integrating sphere. Otherwise its unprotected high gloss
aluminum surface could be damaged.
Technical data
Spectral range 420 – 1000 nm
Sphere material Spectralon
Sphere diameter 75 mm
Light inlet aperture
∅ 10 mm
Reflectance aperture
∅ 12 mm
Light outlet aperture
∅ 16 mm
Transmittance cells Width 12.5 mm
Path length up to 10 mm
Solid transmittance samples Length up to 250 mm
Width up to 85 mm
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