Integrating Sphere ISP BaSO₄ Precise luminous flux measurement of laser, VCSEL, LED & luminaires (VIS)
Barium sulfate（BaSO₄）coating and high measurement accuracy
Instrument Systems has developed ISP integrating spheres with BaSO4 coating in all sizes - for tiny light sources as VCSEL or individual LEDs as well as for LED modules, lamps and big luminaires. As accessories to our CAS series of spectroradiometers they are needed for a wide range of measurement tasks in the lab and production. Thanks to optimized inside geometry, all integrating spheres from Instrument Systems exhibit high measurement accuracy. The high-quality barium sulfate coating is extremely stable in the long term, and especially suitable for the visible (VIS) spectral range.
The new BaSO4 integrating spheres ISP 75B and ISO 100B consist of three freely configurable ports for measuring devices like photodiode and/or spectroradiometer and an external auxiliary light source (optional) for self absorptions correction. The newly optimized optical design guarantees lowest measurement deviations.
For ISP 150 the external auxiliary light source is also optional, whereas ISP 250 and larger come with a built-in auxiliary light source.
The BaSO4 integrating spheres with a diameter ‹ 500 mm have a lateral measurement port for determining luminous flux in the 2π configuration. Here, only the forward-directed radiation is measured. With larger BaSO4 spheres, the sample can additionally be secured in the center of the sphere for measuring the luminous flux in the 4π configuration. Emission in all directions can thus be determined, and total luminous flux can be measured.
Integrating spheres ISP BaSO4 – Product details:
- Barium sulfate coating with 97% reflection in the visible spectral range
- Minimal aging effects and extremely low fluorescence level of coating
- Perfectly tailored to the spectrometer and photodiode portfolio from Instrument Systems
- Determination of self absorption correction (SAC) possible with auxiliary light source
The right integrating sphere for every light source
The decisive factor for selection of the right sphere is the maximum size and the radiation angle of the light source to be measured. Small ISP Integrating spheres (75–150 mm) were specially developed for the measurement of lasers, µLEDs or individual LEDs. They are to be found in many labs and production lines. Medium-sized ISP spheres (250–1000 mm) are suitable for a wide range of LED modules and luminaires, while the ISP 2000 integrating sphere is used for the measurement of particularly large and heavy luminaires and SSL products.
Instrument Systems offers the ISP 150 integrating sphere for determining the transmittance or reflectance value of diffusely scattering samples. Its design complies with the requirements of DIN 5036 for diffuse reflection measurements: 150 mm inside diameter, 25 mm measurement port and 8° angle of incidence.
Model overview
