Latest Test and Measurement News

Absolute LIV Measurements of pulsed Light Sources

15 August 2024 – The new PD 100 photodiodes are Instrument Systems’ high-performance detectors for the fast and highly accurate measurement of radiant flux in the VIS to near IR spectral region. In combination with a 3-port ISP integrating sphere and a CAS spectroradiometer, they enable particularly fast and precise measurement of the luminous flux and absolute radiant power in production. Also pulsed light sources (e.g. VCSEL) or low light test objects can be measured.

The new PD 100 photodiodes from Instrument Systems can be perfectly integrated into a measuring system for luminous flux or radiant power, consisting of an Instrument Systems’ integrating sphere and a CAS spectral radiometer. Its calibration data is stored on the photodiode in 10 nm steps. The SpecWin Pro software from Instrument Systems combines the sensitivity of the PD 100 determined by traceable calibration and the spectral data of the spectrometer measurement of the test object – for highly accurate, traceable and very fast LIV measurements from a single source.

The PD 100 photodiodes are used for fast and highly accurate measurements, even of low light sources in production and laboratory. Due to their fast response time, they are particularly suitable for the precise measurement of pulsed light sources, for example for determining the LIV curve of a VCSEL.

The PD 100 photodiodes with silicon detector (400–1100 nm) are for integrating spheres with barium sulfate coating. Photodiodes with InGaAs detector (900–1700 nm) are connected to spheres with PTFE coating, which is extra stable and therefore particularly suitable for measurements at wavelengths above 1100 nm. Integrating spheres for the PD 100 photodiodes are available in sizes from 75 mm to 250 mm, allowing a wide range of applications in laboratory and production.

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