Integrating Spheres

Gigahertz-Optik Inc.

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NEWBURYPORT, Mass., Feb. 7, 2011 — To measure luminous flux (lumens), color and spectral distribution of large-area LED solid-state and traditional type light sources, a large-diameter integrating sphere is commonly used. Gigahertz-Optik Inc.’s new ISD family of integrating spheres is designed for use with the BTS256-LED tester.

The ISD-100HF-V01 39-in. 1000-mm-diameter integrating sphere is coated with proprietary ODP97 white diffuse barium sulfate coating. A bayonet mount on the detection port enables attachment of the BTS256-LED tester.

The sphere is designed for 4-pi geometry measurements of omnidirectional light sources. The hinge frame stand allows one hemisphere to open/close for mounting of the test LED or lamp source in the center of the sphere.

A height-adjustable all-purpose telescoping sample holder supports positioning and electrical connection of the test light source in the sphere center, and an auxiliary port located at the bottom of the sphere enables handling of test sources with nonstandard cables and connections. A port plug is available to cover this port when not in use.

To compensate for any substitution correction and self-absorption errors caused by a different size port aperture or the test source placed inside the sphere, a 100-W auxiliary lamp is included. The PC-operated LED tester and auxiliary lamp correction function are all under control of the included G.O.O.S. software. The optional BTS256-LED-ALP power supply is available for use with any of the company’s integrating spheres, and it provides stable operation of the quartz halogen auxiliary lamp plus offers a trigger input for remote on/off control of the LED tester. The power supply (110/230V 50/60Hz) can be manually set to the auxiliary lamp specifications in use.

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Published: February 2011