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

Fang Ou1,2, Anne van Klinken1, Petar Ševo1,2

  • 1Department of Applied Physics and Eindhoven Hendrik Casimir Institute, Eindhoven University of Technology, P.O. Box 513NL, 5600 MB Eindhoven, The Netherlands.

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Summary
This summary is machine-generated.

A new handheld near-infrared (NIR) spectral sensor module offers a compact, low-cost alternative to traditional spectrometers. This robust device demonstrates comparable performance in quantifying moisture in rice and classifying plastics.

Keywords:
integrated photonicsnear-infraredportable devicessensorsspectral sensing

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Sensor Technology

Background:

  • Near-infrared (NIR) spectroscopy is crucial for material analysis but traditional spectrometers are bulky and expensive.
  • There is a significant demand for miniaturized, robust, and low-cost NIR sensors for portable applications.
  • Existing NIR technologies face limitations in field deployment due to size, cost, and fragility.

Purpose of the Study:

  • To demonstrate a handheld NIR spectral sensor module with a fully-integrated multipixel detector array.
  • To evaluate the performance of this compact NIR sensor module against a commercial portable spectrometer.
  • To assess the sensor's capability in quantifying moisture content and classifying plastic types.

Main Methods:

  • Development of a handheld NIR spectral sensor module operating in the 850-1700 nm range.
  • Comparison of the spectral sensor module with a commercial portable spectrometer.
  • Application case studies: quantifying moisture in rice grains and classifying plastic types.

Main Results:

  • The handheld NIR spectral sensor module achieved comparable performance to a commercial spectrometer.
  • Moisture quantification in rice yielded a root mean square error (RMSE) of 1.4% for the spectral sensor versus 1.1% for the spectrometer.
  • Plastic type classification achieved 100% accuracy with the spectral sensor and 96.4% with the spectrometer on unknown samples.

Conclusions:

  • The developed compact NIR spectral sensor module shows significant potential for various NIR sensing applications.
  • The sensor offers a viable, cost-effective, and portable alternative to traditional bulky spectrometers.
  • This technology enables robust in-field material analysis, broadening the accessibility of NIR spectroscopy.