Integrating spheres generally function as a light collector. The collected light can be used as a diffuse illumination source or as a measurement source. In the Avantes line of integrated spheres the spheres are mostly used as measurement source. The basic principle of operation is that light enters the integrating sphere through the sample port, goes through multiple reflections and is scattered uniformly around the interior of the sphere. The detection fiber optics are SMA-coupled to the port at the side of the sphere which is viewing illumination on a baffle, independent of the angular properties of the light at the sample port. The baffle prevents first reflections to enter the detection fiber.
The AvaSphere integrating sphere family can be delivered with an active diameter of 30, 50 or 80 mm and an SMA port at 90 degrees for irradiance and reflection measurements. The reflection sphere has an additional SMA- connector port at 8 degrees, for direct illumination, coupling the light into sphere through a fiber and a COL-UV/VIS collimating lens, connected to a light source. The AvaSphere-30 has a sample port diameter of 6 mm, the AvaSphere-50 10 mm sample port and 15 mm for the 80 mm diameter sphere.
All sample ports are knife-edge, this ensures 180 degree field of view of the sample port. The irradiance version of the integrating sphere can be used to measure light sources (Laser, LED, and Halogen Lamps). For the irradiance measurements of LED's a special adapter was developed to be connected to the AvaSphere-50-IRRAD. The adapter can hold 3, 5 and 8 mm LED's in the correct and reproducible position inside the sphere.
The reflection version is used to measure total integrated reflectance of a surface, as well as for color measurement and fluorescence spectroscopy. The measurement principle is based on direct illumination and indirect reflection. A light source may be connected to the 8 degree SMA-connector port through a fiber optic bundle to make the integrating sphere an ideal uniform light source. The inside of the integrating sphere is made out of highly reflective diffuse material; that gives a light diffuse reflection (>96 %) over a wide wavelength range (250-2500 nm). A special gloss-trap is available for the AvaSphere-50-REFL reflection sphere to exclude specular reflection in the measurement. This option needs to be ordered together with the sphere. In case specular reflection needs to be included, a white reflective part can be mounted in the position of the gloss trap.
| Reflection Integrating Sphere |
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Irradiance Integrating Sphere
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LED measurement
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Reflection curve AvaSphere
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Technical Data
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AvaSphere-30
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AvaSphere-50
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AvaSphere-80
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Internal diameter (mm)
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30
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50
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80
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Sample port diameter (mm)
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6
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10
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15
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External Dimensions
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59.5 mm diameter
40 mm height
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69.5 mm diameter
60 mm height
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109 mm diameter
95 mm height
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Ordering Information
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AvaSphere-30-IRRAD
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Integrat. Sphere 30mm for light measurements (250-2500nm), Sampleport 6 mm
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AvaSphere-50-IRRAD
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Integrat. Sphere 50mm for light measurements (250-2500nm), Sampleport 10 mm
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AvaSphere-80-IRRAD
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Integrat. Sphere 80mm for light measurements (250-2500nm), Sampleport 15 mm
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AvaSphere-30-REFL
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Integrat. Sphere 30mm for reflection (250-2500nm), Sampleport 6 mm , 2 SMA port
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AvaSphere-50-REFL
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Integrat. Sphere 50mm for reflection (250-2500nm), Sampleport 10 mm , 2 SMA port
Including AvaSphere-GT50-W
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AvaSphere-80-REFL
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Integrat. Sphere 80mm for reflection (250-2500nm), Sampleport 15 mm , 2 SMA port
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AvaSphere-LED-ADR
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Cylindrical Adapter to hold 3, 5, 8 mm LED's inside the AvaSphere-50-IRRAD
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AvaSphere-LED-ADR-80
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Cylindrical Adapter to hold 3, 5, 8 mm LED's inside the AvaSphere-80-IRRAD
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AvaSphere-GT50
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Optional Gloss Trap for AvaSphere-50-REFL, coated with black absorbing material.
Only in combination with AvaSphere-50-REFL.
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AvaSphere-GT50-W
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Gloss Trap coated with white material to include specular reflection. standard included in AvaSphere-50-REFL.
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AvaSphere-GT50-HOLD
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WS-2 Tile holder for AvaSphere-50-REFL
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