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Thermal Imaging Metrology with a Smartphone Sensor.

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Summary

This study introduces a novel, low-cost thermal imaging system using a smartphone sensor. It achieves a temperature resolution below 10°C for high-temperature measurements, making advanced thermal imaging more accessible.

Keywords:
infraredmetrologyquantitative thermographyradiometrythermal imagingthermographythermometry

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Area of Science:

  • Engineering
  • Materials Science
  • Optics

Background:

  • High-cost thermal imaging cameras limit accessibility in research and industry.
  • Existing systems often struggle with low measurement uncertainty for high-temperature objects.

Purpose of the Study:

  • To develop and validate a quantification methodology for an ultra-low cost thermal imaging system.
  • To assess the temperature measurement performance of a smartphone-based thermal imaging sensor.

Main Methods:

  • Utilized a back-illuminated silicon Complementary Metal Oxide Semiconductor (CMOS) sensor from the smartphone market.
  • Integrated the sensor with a Raspberry Pi and a custom-designed triplet lens assembly.
  • Characterized system performance using state-of-the-art techniques and metrics for temperature resolution and uncertainty.

Main Results:

  • Achieved a temperature resolution below 10°C within the 600°C–1000°C range.
  • Determined the minimum angular subtense for accurate thermal measurement to be 1.35°.
  • Considered scene-dependent aspects of combined uncertainty for practical applications.

Conclusions:

  • The developed smartphone-based system offers a viable low-cost alternative for thermal imaging.
  • The quantification methodology provides a benchmark for evaluating similar low-cost thermal imaging systems.
  • Improved metrology in thermal imaging is achievable with accessible sensor technology.