Introduction to Integral Sphere: From Characteristics to Applications

Introduction to Integral Sphere The Integral Sphere is a hollow sphere, also known as a photometric sphere, a luminous sphere, etc. Usually, one or several windows are opened on the outer wall of the integrating sphere to serve as the light inlet, sample outlet, and light output outlet. Some integrating spheres are also equipped with standard whiteboards, optical traps, sample holders, hole plugs and other integrating sphere accessories to assist with various optical measurement requirements, etc. The inner wall is coated with an ideal white high diffuse reflection material, and the light entering the integrating sphere is reflected multiple times by the diffuse reflection layer on the inner wall, resulting in a uniform illumination that can eliminate the influence of uneven light beams. To achieve high measurement accuracy, the aperture ratio of the integrating sphere should be as small as possible. The aperture ratio is defined as the ratio of the area of the sphere at the opening of the integrating sphere to the area of the entire inner wall of the sphere. Each integrating sphere has a wide range of applicability and can be combined with spectrometers, optical fibers, light sources, and various optical measurement devices to form a system for various sample measurements, such as sample surface reflectivity, sample transmittance, light source radiation, and so on. The material of the diffuse reflection surface on the inner wall of the integrating sphere: The material of the diffuse reflection surface on the inner wall of the integrating sphere determines the service life, accuracy, stability, and so on of the integrating sphere. Usually, the materials of the diffuse reflection surface on the inner wall of the integrating sphere include PTFE, BASO4, and MGO2. The reflectivity curves of these three materials are shown in Figure (1): From Figure (1), it can be seen that in the spectral band of 200-2500NM, PTFE has a higher reflectivity than BASO4 and MGO2, and has excellent Lambert properties and a flat spectrum. The parameters of different diffuse reflective coating materials are shown in Figure (2)

Universal integrating sphere can be customized with different openings and sizes. Product Presentation: This spectral universal integrating sphere is suitable for building different spectral measurement systems. It has high cost-effectiveness and strong universality. With corresponding accessories, it can be used as a uniform light source, laser power for spectral measurement, transmittance measurement, reflectance measurement, and more. The integral ball is designed with a universal opening, which can quickly install corresponding accessories according to different applications, meeting the multi-purpose needs of one ball. It is easy to operate and flexible to use. Customers can also customize the opening size and position according to specific needs. Jingyi Optoelectronics' integrating sphere adopts a diffuse reflective coating with high stability, excellent Lambertian characteristics, and high diffuse reflectance. The coating is not easy to yellow or peel off, which can achieve the best testing effect.

Product features: 1. Can be applied to multiple spectral measurements, with strong universality. 2. High performance diffuse reflection layer, high stability. 3. Excellent Lambertian characteristics. 4. Can be matched with different accessories, flexible operation. 5. Customizable opening

Product application: 1. Uniform light source for various types of light sources. 2. Reflectance spectrum measurement. 3. Transmittance spectrum measurement. 4. Laser power spectrum measurement. 5. Fluorescence quantum efficiency spectrum measurement. 6. Scientific research experiments and analysis. 7. Product testing and identification. 8. Radiation calibration and calibration

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