Properties and Applications of Integrating Sphere


Integrating sphere is a versatile optical element that has multiple Lambertian reflections at the inner surface. This reflection results in the homogenous distribution of optical radiation. The radiation source located in two locations; either inside the sphere or in front of the source’s entrance port.

Properties of integrating sphere

The irradiance of the integrating sphere labsphere is proportional to the total radiant power emitted either by the source inside the sphere or by the one located at the entrance port.

The irradiance level does not depend on the geometrical and directional distribution of the primary source if direct illumination of the respective location is prevented. This property makes the instrument useful optical element for the detection of radiant power.

The radiance reflected from the inner surface of the sphere and shielded from the direct illumination, is constant in its directional distribution and independent of the specific location where the reflection occurs. Thus, the radiation leaving the sphere is characterized by homogeneous radiance and exitance distribution. This makes it useful as the standard calibration source.

Application of Integrating Sphere

·         It is widely used instrument for optical measurements. The interior of the integrating sphere scatters the light evenly at all the angles.

·         It is used to study the reflection and absorption of samples.

·         It provides a photometric standard by creating a reference radiation source.

·    The detector connected to an integrating sphere labsphere measures all the incident light collected by it.

ISI series of integrating sphere in Kewlab use to measure the irradiance of LEDs, lasers, and another useful light source. The measurement port with the SMA905 connector orients at an angle of 900 to the sample port.


Location: Australia

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