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THERMAL IMAGING


of that baseline. Te second uses an absolute temperature measurement, which requires a calibrated reference temperature source or black body. ‘Either one of these set-


ups would work in a hospital setting,’ Tarin said. ‘Te addition of the black body adds a bit more complexity to the system, but not much. Either setup requires an occasional adjustment to make sure the system does not create false positives or false negatives.’ Zinssmeister at Flir Systems


noted that ‘when setting up a screening system, it is important to understand that temperature reading accuracy is not about the exact absolute temperature of any single person. Rather, it’s about how the camera’s application is measuring relative temperature readings to other people, taking into account external conditions such as hot or cold.’ Termal cameras can only measure the surface skin temperature, which is going to vary depending on how hot or


Jenoptik receives multi-million-euro order for IR cameras


Jenoptik is to supply InfraTec with handheld and stationary high-end infrared cameras and infrared lenses in an order worth several million euros. The agreement is


a continuation of the partnership between Jenoptik and Dresden- based InfraTec. The uncooled thermography cameras in Jenoptik’s VarioCam HD series provide resolutions up to 640 x 480 pixels. The


handheld and stationary infrared cameras are used for research and development, and can be used to screen people for elevated body temperature at transport hubs.


cold the room is, among other factors. Tarin said the main challenge


for using thermal cameras for this kind of application is human physiology. ‘We are not measuring the temperature of a piece of steel,’ he said; ‘we are looking at a living being. We need to understand that thermal cameras can really


only measure the surface temperature of any object they are being pointed at. So even if we had a 5-megapixel thermal camera with an accuracy of 0.0001ºC, this still would not solve the issue with thermoregulation [in humans]. Te human body takes about 30 minutes to normalise its skin temperature, after entering an


air conditioned room from a much colder or much warmer environment to put this into perspective. ‘Nonetheless, using these


cameras for elevated body temperature screening is still a valuable tool, as long as you understand the important variables involved,’ he concluded. O


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