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A calibration procedure for field and UAV-based uncooled thermal infrared instruments

Citation

Aragon, B and Johansen, K and Parkes, S and Malbeteau, Y and Al-Mashharawi, S and Al-Amoudi, T and Andrade, CF and Turner, D and Lucieer, A and McCabe, MF, A calibration procedure for field and UAV-based uncooled thermal infrared instruments, Sensors, 20 Article 3316. ISSN 1424-8220 (2020) [Refereed Article]


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Copyright Statement

Copyright 2020 The Authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

DOI: doi:10.3390/s20113316

Abstract

Thermal infrared cameras provide unique information on surface temperature that can benefit a range of environmental, industrial and agricultural applications. However, the use of uncooled thermal cameras for field and unmanned aerial vehicle (UAV) based data collection is often hampered by vignette effects, sensor drift, ambient temperature influences and measurement bias. Here, we develop and apply an ambient temperature-dependent radiometric calibration function that is evaluated against three thermal infrared sensors (Apogee SI-11(Apogee Electronics, Santa Monica, CA, USA), FLIR A655sc (FLIR Systems, Wilsonville, OR, USA), TeAx 640 (TeAx Technology, Wilnsdorf, Germany)). Upon calibration, all systems demonstrated significant improvement in measured surface temperatures when compared against a temperature modulated black body target. The laboratory calibration process used a series of calibrated resistance temperature detectors to measure the temperature of a black body at different ambient temperatures to derive calibration equations for the thermal data acquired by the three sensors. As a point-collecting device, the Apogee sensor was corrected for sensor bias and ambient temperature influences. For the 2D thermal cameras, each pixel was calibrated independently, with results showing that measurement bias and vignette effects were greatly reduced for the FLIR A655sc (from a root mean squared error (RMSE) of 6.219 to 0.815 degrees Celsius (℃)) and TeAx 640 (from an RMSE of 3.438 to 1.013 ℃) cameras. This relatively straightforward approach for the radiometric calibration of infrared thermal sensors can enable more accurate surface temperature retrievals to support field and UAV-based data collection efforts.

Item Details

Item Type:Refereed Article
Keywords:thermal infrared camera, calibration, vignetting, UAV, agricultural monitoring, Apogee SI‐111, FLIR A655sc, TeAx 640, Tau 2, RPAS
Research Division:Engineering
Research Group:Geomatic Engineering
Research Field:Photogrammetry and Remote Sensing
Objective Division:Environment
Objective Group:Land and Water Management
Objective Field:Farmland, Arable Cropland and Permanent Cropland Water Management
UTAS Author:Turner, D (Dr Darren Turner)
UTAS Author:Lucieer, A (Professor Arko Lucieer)
ID Code:139357
Year Published:2020
Deposited By:Geography and Spatial Science
Deposited On:2020-06-11
Last Modified:2020-07-27
Downloads:0

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