Wide-range spectroradiometer for precision testing of light sources

Saelig Company, Inc. has introduced the GL Optic Spectis 4.0M Wide-Range High-end Spectroradiometer Series for precision testing of light sources and other applications. This measuring instrument spans an extended spectral range from 200nm to 1050nm (UV-VIS-NIR) and is designed using only high-performance optical components. It is delivered with a multi-step, factory-calibrated process.

This high-end spectroradiometer is ideal for LED characterisation, as it can be paired with GL Optic integrating spheres and goniometer systems for measurements in accordance with CIE 127:2007 and CIE 025/E:2015. The high accuracy and resolution make it an excellent instrument for measurements conforming to (IES) LM-79-08 and other international standards. The GL SPECTIS 4.0 M UV performs measurements in the ultraviolet range with high optical resolution of <1nm (FWHM). The device can be calibrated to measure absolute values of irradiance in the range of 200nm-400nm.

The primary goal in designing the new spectroradiometer was to develop a new modular technology for optical radiation measurements. This instrument can be tailored to individual needs while maintaining laboratory-grade accuracy. Each spectroradiometer is individually calibrated, and prior to the Absolute Spectral Calibration process, various pre-calibration stages are performed, including wavelength calibration, non-linearity correction, and stray-light examination.

Thermal stabilisation applied directly to the detector reduces noise and the values of dark current, which directly improves the measurement capabilities of low-level signals, especially in the ultraviolet range (e.g. LED UV-C). This solution will also ensure independence from the ambient temperature in the application range. The variable optical path module ensures flexibility in adjusting the optical properties of the system by changing the aperture and filters. This solution enables users to quickly adapt the instrument to specific measurement needs, often eliminating the need to install a dedicated measuring probe for each application, while maintaining calibration parameters for all optical path configurations. Improving the quality of ultraviolet measurements is crucial for assessing challenges such as photobiological safety, the actinic effects of optical radiation, and the validation of radiation sources used for disinfection and medical applications.

The GL Spectis 4.0 M high-end spectroradiometer features the latest optical solutions for precise control of light quality in various applications. For demanding measurement applications in the laboratory or production environment, it is equipped with Peltier cooling, which reduces measurement uncertainty due to lower signal noise and minimised dark current levels. With its universal, modular design, the GL Spectis 4.0 M is a perfect choice for easily building a dedicated, custom measuring instrument. By adding an extra filter, it is possible to extend the spectral range for specific needs. When connected to an integrating sphere, it is possible to measure both the total luminous flux and radiant power. A range of compatible GL OPTI Probes, equipped with quick connectors, introduces new simplicity. When combined with luminance/radiance telescopic probes, specialised evaluation of optical radiation-related hazards and light quality can be performed. Available rack housing allows easy integration in stationary laboratory measuring stands or production testers. An Ethernet connection ensures the stability and reliability of operation.