The ISD-5-VL integrating sphere detector employs an 50 mm / 2 inch diameter Barium Sulfate (ODP97) coated integrating sphere with 12.7 mm / 0.5 inch diameter measurement port and a photometric sensor.
The sphere mounted photometric sensor is equipped with a diffusor so that the detector integrates reflected light from almost the complete integrating sphere surface. This greatly reduces hot spot effects caused by the first reflection of the light.
The sensor is positioned close to the measurement port to produce a large acceptance angle within the sphere without direct irradiation of the detector.
Calibration of luminous flux sensitivity in lm is performed at Gigahertz-Optik’s Calibration Laboratory for Optical Radiation Quantities.