Design criteria for integrating spheres for material properties (ISM)

UM ISM 500x500 gray

Design criteria for the configuration of integrating spheres for material characterization (ISM)


Photometric material properties, such as reflection, transmission, absorption, fluorescence and photoluminescence can be accurately determined with our integrating spheres. In all these applications an optical source is needed for reference or excitation.

Typical measurement arrangements with collimated light sources

Number1-border Reflection: integrating sphere with sample port and collimated light source for illuminating the sample through the sphere for measuring total and diffuse reflectance of the sample.
Number2-border Transmission: integrating sphere with sample port at sphere entrance with collimated light source for illuminating the sample. For measuring total transmission including scattered light from the sample.
Number3-border Absorption and fluorescence: integrating sphere with sample holder for mounting the sample in the center of the sphere. Sample illumination with collimated light source. Absorption: measures the difference with and without the sample. Fluorescence and photoluminescence: measures the emitted radiation from the excited sample


designcriteria UM 3



reflection -- transmission -- absorption, fluorescence, photoluminescence

1. Integrating sphere 2. Light source housing 3. Sample



 Typical measuring arrangement with diffuse sample illumination

Integrating sphere with sample holder for mounting the sample in the centre of the sphere. Diffuse illumination of the sample by light source with baffles. Spectral absorption measurement of the sample by the illumination spectrum.

designcriteria UM 4



diffuse illumination of samples

1. Integrating sphere 2. Lamp 3. Baffle 4. Sample