We used three different spectrometers in our study: one full-range vis-NIR devices (Veris Technologies Inc., Salina, KS, USA), one MEMS-spectrometer for measuring in the visible range (Hamamatsu Photonics K.K.) and one MEMS-spectrometer capturing the NIR range only (Si-Ware Systems Inc., Menlo Park, CA, USA). An overview of the devices and their technical specifications can be seen in Table 1.

Overview of technical specifications for the selected devices.

The Veris device uses two internal spectrometers (Ocean Optics USB4000 and Hamamatsu C9914GB). At the beginning and end of the spectra of the Hamamatsu C12880MA device some bands were cut off to match the transition range of the used optical fibre.

Furthermore, for the Veris spectromters bands were cut of at the beginning and end due to a known high amount of noise. Data between the ranges of the two Veris spectrometers (1000 to 1100 nm) were removed. Calibration of the Veris spectrometer was done using four Fluorillon grey standards as external references [41]. The other devices were calibrated by means of a Spektralon plate. In our study, we investigated the performance of each single device and moreover, the data from the Hamamatsu and NeoSpectra device were merged into one vis-NIR data set to evaluate combined performance of the MEMS-spectrometers using the visual and near-infrared range at the same time. This data fusion results in a gap between the ranges of devices from 850 to 1350 nm and therefore still contains less spectral information than the full-range device.

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