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A Smartphone-Based Infrared Thermal Imaging Temperature Sensor for Accurate Temperature Measurement of Pig Groups

Uncooled infrared thermography has shown great potential for rapid screening of the body temperature of pigs. However, temperature measurements can produce serious errors due to variations in body surface emissivity caused by skin stains or differences in emissivity between body parts. To address this problem, a rotatable infrared filter is added to the optical path of the smartphone-based uncooled infrared detector in this paper. By adding and removing the filter to obtain infrared radiation in different wavelengths, the altering spectrum temperature measurement equation is constructed to reduce the effect of emissivity differences in the measurement process of temperature. On this basis, we developed a smartphone sensor based on an uncooled infrared thermography temperature measurement system with altering spectrum. The sensor enables fast and accurate measurement of pig temperature in the group, which can provide powerful technical support for the diagnosis of physiological abnormalities and diseases in pigs.