Handheld NIR Spectral Sensor Module Based on a Fully-Integrated Detector Array

Fang Ou (Corresponding author), Anne van Klinken, Petar Ševo, Maurangelo Petruzzella, Chenhui Li, D.M.J. van Elst, Kaylee D. Hakkel, Francesco Pagliano, P.J. van Veldhoven, Andrea Fiore

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For decades, near-infrared (NIR) spectroscopy has been a valuable tool for material analysis in a variety of applications, ranging from industrial process monitoring to quality assessment. Traditional spectrometers are typically bulky, fragile and expensive, which makes them unsuitable for portable and in-field use. Thus, there is a growing interest for miniaturized, robust and low-cost NIR sensors. In this study, we demonstrate a handheld NIR spectral sensor module, based on a fully-integrated multipixel detector array, sensitive in the 850–1700 nm wavelength range. Differently from a spectrometer, the spectral sensor measures a limited number of NIR spectral bands. The capabilities of the spectral sensor module were evaluated alongside a commercially available portable spectrometer for two application cases: to quantify the moisture content in rice grains and to classify plastic types. Both devices achieved the two sensing tasks with comparable performance. Moisture quantification was achieved with a root mean square error (RMSE) prediction of 1.4% and 1.1% by the spectral sensor and spectrometer, respectively. Classification of the plastic type was achieved with a prediction accuracy on unknown samples of 100% and 96.4% by the spectral sensor and spectrometer, respectively. The results from this study are promising and demonstrate the potential for the compact NIR modules to be used in a variety of NIR sensing applications
Original languageEnglish
Article number7027
Number of pages17
Issue number18
Publication statusPublished - 16 Sept 2022


This research was partially funded under NWO TTW project n. 16670, Penta Call 2 project Environmental Sensors for AIR Quality (ESAIRQ) n. 16113, NWO project n. 17626 (System change for New Ecology-based and Resource efficient Growth with high tech In Agriculture (Synergia)) and the NWO Zwaartekracht Research Center for Integrated Nanophotonics.

FundersFunder number
Nederlandse Organisatie voor Wetenschappelijk Onderzoek16670, 16113, 17626


    • integrated photonics
    • near-infrared
    • portable devices
    • sensors
    • spectral sensing


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