An integrating sphere is an optical device that is coated with a diffuse reflective material that causes the incident light to be diffusely reflected on the inner wall of the sphere many times, resulting in uniform illumination. Integrating spheres are used for a variety of purposes, mainly including the following:
Measurement of luminous flux, color temperature, luminous efficiency and other parameters of the light source: The integrating sphere can be used to test the luminous flux, color temperature, luminous efficiency and other parameters of the light source. The basic principle is that light is collected by the integrating sphere through the sampling port and scattered very evenly inside the integrating sphere after multiple reflections. Measuring luminous flux with an integrating sphere makes the measurement results more reliable, reducing and eliminating measurement errors caused by differences in the shape of the light, the divergence angle, and the responsivity of different locations on the detector.
Measurement of reflectivity and transmittance: An integrating sphere can be used to measure the reflectivity and transmittance of an object. By placing the object to be measured at the light outlet of the integrating sphere, the ratio of reflected light and transmitted light of the object can be measured, so as to obtain its reflectance and transmittance.
Colorimetric measurement: An integrating sphere can be used to measure the color of an object. By measuring the intensity of the reflected light of the object to be measured at various wavelengths, the color characteristics of the object can be determined.
Uniform Illumination: The integrating sphere can also be used as a uniform illuminator to provide illumination for places where uniform illumination is required.
Overall, the integrating sphere is a very useful optical device, which is widely used in light source testing, color measurement, optical measurement, and other fields.