Abstract
Recently, miniaturization of Raman, mid-infrared (MIR) and near-infrared (NIR) spectrometers have made substantial progress, and marketing companies predict this segment of instrumentation a significant growth rate within the next few years. This increase will be based on a more frequent implementation for industrial quality and process control and a broader adoption of spectrometers for in-the-field testing, on-site measurements, and every-day-life consumer applications. The reduction in size, however, must not lead to compromises in measurement performance and the hand-held instrumentation will only have a real impact if spectra of comparable quality to laboratory spectrometers can be obtained. The present communication will, on the one hand, explain the instrumental reasons why NIR spectroscopy is presently the most advanced technique regarding miniaturization and on the other hand, it will emphasize the impact of NIR spectroscopy for plant analysis by discussing in some detail a qualitative and a quantitative application example.
Highlights
Miniaturization of vibrational spectrometers started more than two decades ago, but only within the last decade real hand-held Raman, MIR and NIR scanning spectrometers have become commercially available and have been utilized for a broad range of analytical applications (Sorak et al, 2012; Guillemain et al, 2017; Crocombe, 2018; Karunathilaka et al, 2018; Soriano-Disla et al, 2018; Vargas Jentzsch et al, 2018)
The gradual zone for the RMSECV screening process indicates that wavelength variables irrelevant to the type of fengdou were removed, and the growth zone indicates that the essential variables relating to the type of fengdou were excluded
The reference values of solids content (SSC), dry matter content (DMC), total polyphenol content (TPC), and total flavonoids content (TFC) in mulberry fruits were determined after the spectra were recorded
Summary
Miniaturization of vibrational spectrometers started more than two decades ago, but only within the last decade real hand-held Raman, MIR and NIR scanning spectrometers have become commercially available and have been utilized for a broad range of analytical applications (Sorak et al, 2012; Guillemain et al, 2017; Crocombe, 2018; Karunathilaka et al, 2018; Soriano-Disla et al, 2018; Vargas Jentzsch et al, 2018). While the weight of the majority of Raman and MIR spectrometers is still in the s1 kg range, the miniaturization of NIR spectrometers has advanced down to the ~100 g level and developments are underway to integrate them into mobile phones (Tino et al, 2016). Miniaturized NIR systems have recently reached the
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