Featured | Tools | Measurement | Goniophotometers | Goniospectrometer | Aug 30, 2019

Goniometer LGS 650: Higher Accuracy and Reproducibility

Goniophotometry is an absolute measuring procedure that can achieve a higher level of accuracy than sphere photometry. It does not require a luminous flux standard, but in contrast is often used for calibrating standard lamps for luminous flux. In addition to the luminous flux, photometric spatial radiation properties, so-called luminous intensity distribution curves and the colorimetric distribution of radiation emitted from a light source can be determined. Partial luminous flux, i.e. the photometric radiant flux in a limited solid angle range, can also be measured for e.g. the evaluation of the energy efficiency class of a test sample.

Instrument Systems offers with the LGS 650 goniophotometer a compact measuring system for solid-state lighting products and LED modules. It is part of the established LGS family and perfect for samples up to max. 1300 mm diameter and 10 kg weight. The test specimen is operated in a horizontal burning position and measurements can be taken at an angular range of ± 160 ° in the gamma axis. The angular resolution of 0.01 ° enables very fine measuring grids recorded with a high level of accuracy and reproducibility. The LGS 650 is compliant with all relevant specifications in conformity with CIE, DIN and IES standards.

Combined with a spectroradiometer, e.g. CAS 140D, from Instrument Systems, all spectral quantities such as color coordinates, color temperature and even color rendering index can be determined as a function of angle. Spectroradiometers offer the distinct advantage that all radiometric, colorimetric or photometric characteristics can be determined with maximum precision. Instrument Systems also supplies very fast photometers, e.g. the newly developed DSP 200, for performing integral measurements. They are recommended for pure photometric measurements and for time critical test sequences. Combined with the LGS 650, the photometers allow 'on-the-fly' measurements, meaning the measuring system records the light distribution while the goniometer is moving.

The LGS 650 is operated via the goniometer module of the SpecWin Pro software. The software routinely performs measurement sequences to record the spatial radiation pattern of the test specimen. SpecWin Pro controls the power supply to the test specimen and records electrical data. Voltage, current, switch-on and burn-in procedure as well as the sequencing are storable presets and can be retrieved for repeat measurement functions. The graphics window is the central element of the user interface of SpecWin Pro. This window displays all measurements. Several different display options are available for the spatial radiation pattern: Radial display (luminous intensity distribution curve), semi-radial and cartesian view, and a two dimensional spherical display with Isocandela lines and a 3D view. The measured results can also be exported in IES and EULUMDAT format for use in simulation programs.

For more information, please visit www.instrumentsystems.com, contact sales@instrumentsystems.com by email or call +49-89-454943-0

About Instrument Systems GmbH:

Instrument Systems GmbH develops, manufactures and markets turnkey solutions for light measurement. Its main products are array spectrometers, imaging photometers and colorimeters. Key applications are LED/SSL and display measurement, as well as spectroradiometry and photometry. Products of the Optronik line for the automotive industry and traffic technology are developed at the Berlin facility. Since 2012 Instrument Systems has been a wholly owned subsidiary of the Konica Minolta Group. - www.instrumentsystems.com