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Fibre Refractometry for Minimally Invasive Sugar Content Measurements within Produce.

Mark A Zentile1, Peter Offermans1, David Young1

  • 1IMEC the Netherlands, OnePlanet Research Center, Bronland 10A, 6708 WH Wageningen, The Netherlands.

Sensors (Basel, Switzerland)
|October 16, 2024
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Summary

A new needle refractometer offers reliable, cost-effective sugar content measurement in produce. This innovative device minimizes calibration needs and corrects for temperature, improving accuracy for fruit quality assessment.

Keywords:
chemical sensingfibre-optic sensorspostharvest qualityrefractometrysmart agriculture

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Area of Science:

  • Agricultural Engineering
  • Food Science
  • Instrumentation

Background:

  • Accurate sugar content measurement is crucial for produce quality assessment and market value.
  • Traditional refractometry methods can be invasive or require complex calibration.
  • Developing non-destructive, reliable, and cost-effective sugar measurement tools is an ongoing challenge.

Purpose of the Study:

  • To present a minimally invasive needle refractometer for sugar content analysis in produce.
  • To enhance measurement reliability by developing a passive sampling cap structure.
  • To demonstrate an iterative temperature correction method and assess the device's accuracy and potential applications.

Main Methods:

  • Development of a minimally invasive needle refractometer with a passive sampling cap.
  • Implementation of an iterative method for temperature correction without a predefined refractive index model.
  • Validation of the refractometer against a standard prism refractometer.
  • Demonstration of sugar distribution analysis within a single fruit sample.

Main Results:

  • The passive sampling cap effectively minimized interfering back reflections, enhancing reliability.
  • The iterative temperature correction method accurately compensated for temperature variations.
  • The sensor achieved a typical standard deviation of 0.4 °Bx over 10-second measurements.
  • Validation showed an average offset of (0.0±0.1) °Bx compared to a prism refractometer.

Conclusions:

  • The developed needle refractometer provides a reliable and accurate method for sugar content measurement in produce.
  • The device's design potentially reduces production costs by minimizing the need for factory calibration.
  • The technology shows promise for non-destructive quality assessment and detailed sugar distribution analysis in fruits.