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Infrared cameras are potential traceable "fixed points" for future thermometry studies.

R Yap Kannan1,2, K Keresztes3,4, S Hussain3

  • 1a Department of Cardiovascular Sciences , University of Leicester , Infirmary Road , Leicester LE2 7LX , UK .

Journal of Medical Engineering & Technology
|October 16, 2015
PubMed
Summary
This summary is machine-generated.

A thermal infrared camera shows potential as a temperature reference "fixed point" for device calibration, offering better agreement than an infrared thermometer. Further studies are needed to confirm its reliability across different models.

Keywords:
Blackbody radiatornon-contact infrared thermometer (IRTh)standard platinum resistance thermometer (SPRT)thermal infrared camera (IRTg)

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Area of Science:

  • Metrology and Temperature Measurement
  • Infrared Thermography
  • Calibration Standards

Background:

  • The National Physical Laboratory (NPL) mandates the use of fixed points based on the International Temperature Scale of 1990 (ITS 90) for device calibration.
  • Near blackbody radiators and standard platinum resistance thermometers are currently accepted standards for temperature calibration.

Purpose of the Study:

  • To evaluate the correlation and limits of agreement (LOA) between a thermal infrared camera and a non-contact infrared temporal thermometer.
  • To compare these devices against a near blackbody radiator for temperature calibration purposes.

Main Methods:

  • Temperature readings were collected from a thermal infrared camera (FLIR T650sc) and an infrared thermometer (Hubdic FS-700).
  • Measurements were taken against a near blackbody radiator (Hyperion R model 982) at 0.5°C increments between 20-40°C.
  • Blackbody cavity temperature was verified using a platinum resistance thermometer; devices were positioned at fixed distances (20 cm and 5 cm respectively).

Main Results:

  • The platinum resistance thermometer underestimated blackbody temperature by 0.015°C (95% LOA: -0.08°C to 0.05°C).
  • The thermal infrared camera overestimated blackbody temperature by 0.16°C (95% LOA: 0.03°C to 0.28°C).
  • The infrared thermometer showed a larger overestimation of 0.75°C (95% LOA: -0.30°C to 1.79°C) and deviated from the camera by 0.6°C (95% LOA: -0.46°C to 1.65°C).

Conclusions:

  • The thermal infrared camera demonstrates potential as a substitute for mercury thermometers as a temperature reference fixed point.
  • Further research on repeatability and reproducibility is necessary for various thermal infrared camera models.