The basic HELIAS transmission spectrometer consists of fiber optical integrator, double-monochromator, detector and PC system with control and processing software.

The double-monochromator based spectrometer and the photomultiplier analyze the transmission spectrum of the sample. The double-monochromator provides very low stray light. It is equipped with an adjustable slit for selecting the optical bandwidth.

The systems software controls the HELIAS and the data processing. It provides a variety of mathematical functions. The user can easily perform application-specific calculations on the spectra to use the system in routine measurements. The software is compatible with Windows 2000 and XP. The user-friendly graphical interface provides different display options for the spectra and the data. Further options are data export and macros for automatic data acquisition and storage.