INTEGRATGING SPHERES

Integrating spheres distribute incident light by diffusing reflection evenly over the inner surface of the sphere. They are used in a variety of measuring applications for the integration of light and radiation and as a source of uniform diffuse radiation.

The efficiency of the sphere is based on the diffused highly reflecting inner surface and the spherical shape. In addition to selection of the appropriate wavelength for the material, the proportion of the openings on the spherical surface plays a role in its function. Generally, the proportion of the openings should be less than 5% depending on the application requirements, but even much smaller openings are allowed. We will advise you on the selection of a sphere design suitable for your application.

We use barium sulfate, special PTFE (Teflon), and gold as sphere materials. Barium sulfate is suitable for coating very large spheres for the UV/VIS range. PTFE is especially advantageous for small and medium-sized spheres in the visible and UV range. Gold is preferred in the NIR and IR ranges. Our integrating spheres are manufactured individually. Thus, our offerings can range from customer-specific geometries and multiple baffles to integrating spheres for luminous flux measurements with a diameter of 2.5 m. As an accessory, we offer stabilized light sources, auxiliary light sources, port adapters, and light conductors. We recommend our RM-22 radiometer for radiometric measurements.

HIGHLIGHTS OF OUR INTEGRATING SPHERES

  • Specialized in customer-specific production
  • Diameter of 25 mm to 2.5 m
  • Barium sulfate, gold, and PTFE coatings to choose from

To avoid interfering fluorescence and measurement errors, especially at low luminous flux, our integrating spheres are made of gold or BaSO4-coated metal spheres. The PTFE integrating spheres are manufactured as solid hollow spheres in a cylindrical aluminium housing.

Thus, we additionally ensure that for all integrating spheres no light comes from outside, as is possible with thin-walled plastic spheres.

APPLICATIONS OF INTEGRATING SPHERES

  • Measurement of luminance and radiance of lamps
  • Laser power measurement
  • Measurement of LEDs, OLEDs, displays, light guides
  • Detector calibration
  • Measurement of diffuse reflection and transmission
  • Uniform light source

TECHNICAL DATA FOR BASO4, GOLD OR PTFE INTEGRATING SPHERES

Diameter see: part numbers
  customer-specific on request
Coating Barium sulfat (BaSO4)
  PTFE
  Gold
Wavelengths BaSO4 300-2400 nm
  PTFE 200-2500 nm
  Gold 0,7 - 20 µm
Ports 2 (standard)
Baffles 1 (standard)
Options internal illumination
  additional ports
Accessories Light traps
  Radiometer
  Spectrometer
  Port plug
  Port reducer

INTEGRATING SPHERE - IMAGE SOURCE

This website used images with permission of the PTB, the German national test authority, located in Braunschweig. More information can be found on PTB website or in publication „Messung von Licht. Photometrie (German)“.