Integrating-sphere system for measuring the optical properties

The integrating sphere is a cavity sphere coated with a white diffuse reflection material on the inner wall, also known as a photometric sphere, a luminous sphere, etc. One or several window holes are opened on the spherical wall, which are used as light inlet holes and receiving holes for placing light receiving devices. The inner wall of the integrating sphere should be a good spherical surface, and it is usually required that the deviation from the ideal spherical surface should not be greater than 0.2% of the inner diameter. The inner wall of the integrating sphere is coated with an ideal diffuse reflection material, that is, a material with a diffuse reflection coefficient close to 1.  Commonly used materials are magnesium oxide or barium sulfate. After mixing it with a colloidal adhesive, spray it on the inner wall.

The spectral reflectance of the magnesium oxide coating in the visible spectrum is more than 99%. In this way, the light entering the integrating sphere is reflected multiple times by the inner wall coating to form a uniform illuminance on the inner wall. In order to obtain higher measurement accuracy, the opening ratio of the integrating sphere should be as small as possible. The opening 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.

The integrating sphere is also called the luminous sphere, which is a hollow and complete spherical shell. The inner wall is coated with a white diffuse reflection layer, and the points on the inner wall of the integrating sphere are evenly diffused. The illuminance generated by the light source at any point B on the spherical wall is a superposition of the illuminance generated by multiple reflections. The integrating sphere is a high-efficiency device that is mainly used to collect the scattering or emission of light from the sample inside the sphere or outside the sphere and close to a certain window. A small window on the ball allows light to enter and get closer to the detector.

LISUN design the below  size optical integrating sphere works with a Spectroradiometer to do the photometry, colorimetry and radiometry parameters measurement.
• IS-0.3M/IS-0.5M is for LEDs, LED modules, mini LED bulbs & other small lamps. The flux testing range is 0.001 to 1,999 lm
• IS-1.0MA is for CFL or LED bulbs. The flux testing range is 0.1 to 199,990 lm
• IS-1.5MA/IS-1.75MA is for CFL, LED bulb and tube, fluorescent lamp, CCFL. The flux testing range is 0.1 to 1,999,900 lm
• IS-2.0MA is for HID lamps or high power lamps. The flux testing range is 0.1 to 1,999,900lm

LPCE-2(LMS-9000)High Precision Spectroradiometer Integrating Sphere System

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

Our main products are Goniophotometer, Integrating Sphere, Spectroradiometer, Surge Generator, ESD Simulator, EMI Receiver, EMC Test Equipment, Electrical Safety Tester, Environmental Chamber, Temperature Chamber, Climate Chamber, Thermal Chamber, Salt Spray Test, Dust Test Chamber, Waterproof Test, RoHS Test (EDXRF), Glow Wire Test and Needle Flame Test.

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