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Protocol for Standardized Data Collection in Humans
Published in U. Snekhalatha, K. Palani Thanaraj, Kurt Ammer, Artificial Intelligence-Based Infrared Thermal Image Processing and Its Applications, 2023
U. Snekhalatha, K. Palani Thanaraj, Kurt Ammer
The drift of radiometric calibration is well known particularly in focal plane arrays (FPA) built with uncooled micro-bolometers since their measurement response depends on both the FPA temperature and the scene temperature (Nugent et al., 2013). There are multiple methods for internal calibration of thermally non-stabilized infrared cameras, but a drift of temperature readings over time remains in the real world of infrared camera applications. Marjanovic et al. reported for various FLIR models, a within-subject standard deviation in the range between 0.06°C and 0.71°C for the baseline and 3-month follow-up thermal camera measurements acquired across all blackbody temperature points (Marjanovic et al., 2018). Poor traceability of calibration or long periods between calibration is associated with large measurement bias to the reference temperatures (Simpson et al., 2006).
Infrared Thermal Imagers
Published in Kurt Ammer, Francis Ring, The Thermal Human Body, 2019
There are now a wide range of electronic sensors, and thermal cameras built around uncooled bolometers can be effective for medical use. Imaging with uncooled detectors is now well established, and microbolometer arrays are the most used technology. Present state-of-the-art microbolometers are based on polycrystalline or amorphous materials, usually vanadium oxide (Vox) or amorphous silicon (a-Si).
B
Published in Anton Sebastian, A Dictionary of the History of Medicine, 2018
Bolometer A sensitive instrument for measuring changes up to one millionth of a degree centigrade. Devised by Samuel Pierrepont Langley (1834–1906), a pioneer in aeronautics and secretary of the Smithsonian Institute in 1881.
Thermal Imaging of the Ocular Surface in Thyroid Eye Disease: A Comparison between Active, Inactive and Healthy Eyes
Published in Current Eye Research, 2021
Tarjani Vivek Dave, Palash Patodi, Ashutosh Richhariya, Vivek Pravin Dave
The thermal imaging was performed using an infrared thermal camera (Python 640, Analinear technologies, Hyderabad, India). The array type of the camera was 640 × 480 – aSi Micro bolometer with a spectral band of 8–12 µm long wavelength infrared beam. The NETD (Noise equivalent temperature difference) of the camera was <40mK. The infrared (IR) lens used had a focal length of 50 mm and an aperture size of f/1.2. To ensure that the camera is not affected by external atmospheric factors, it was placed inside a controlled environmental chamber. The temperature and humidity were maintained at 25°C and 50%, respectively.