TFCT25 - TFCT25 - Measurement of Light Guide Transmission Properties


We have developed the TFCT25 transmission measurement setup with one main application in mind:
the measurement of a light guide’s transmission properties. A number of elements are required in order to fulfill this task:

  • A high resolution spectral radiometer (BTS2048-VL-TEC) is able to measure the spectral properties, luminous flux and color of a light source.
  • Since light sources and light guide come is many different shapes an integrating sphere is required which collects the emitted light.
    Exchangeable apertures allow the creation of tailored fittings for each light source and light guide shape.
  • A power supply is included. Its triggering function allows the emission of short light
    pulses and their synchronized measurement via the spectralradiometer.

Sample holders with magnetic bases allow the flexible positioning of light guides with complex shapes while still allowing their stable fixture.
A magnetic steel table top is recommended for their use.

For detailed information you'll find the Video here: TFCT25 or via Youtube






New professional article online:

Possibilities of LED/SSL testing in production, laboratories, and different applications

This article will first describe the requirements of LED/SSL (LED = light emitting diode, SSL = solid state lighting) testing and the possible metrological solutions for different applications, ranging from applications in the production field and laboratory measurements, to on-site tests by users/customers. Gigahertz-Optik has over 30 years of experience in light measurement technology, and has taken a very innovative path in spectral measurement with the BTS technology.


For the full article please visit:


Tutorial – Basics of Light Measurement


This tutorial is an introduction to the radiometric, photometric, colorimetric, reflection and transmission principles as well as quantities, symbols, units and the basic nature of light and color. Sections covering some topical applications, detectors, electronics and calibration are also included.

Tutorial – Basics of Light Measurement