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  • System for testing fever screening thermographs / TFEV
  • System for testing fever screening thermographs / TFEV
  • System for testing fever screening thermographs / TFEV
  • System for testing fever screening thermographs / TFEV

TFEV

Article: 00249791

System for testing fever screening thermographs / TFEV

TFEV is a system for testing fever screening thermographs (measurement thermal camera systems optimized for fever screening). It is a valuable tool to determine real technical abilities to of myriads of fever screening thermal cameras offered on market. TFEV test concept is based on recommendations of the standard IEC 80601-2-59 - "Particular requirements for the basic safety and essential performance of screening thermographs for human febrile temperature screening" TFEV is a modular system that can work in two modes: A)high accuracy blackbody of manually regulated size. B)motorized image projector capable to project images of some reference targets of variable temperature and size. The blackbody is to simulate different parts of human body (typically eye inner canthus or forehead) for tested thermal camera. It is located at plane where typically tested human and the thermograph external blackbody (part of tested system) should be located during real work. Image projector (system built by combining blackbody, motorized rotary wheel, set of IR targets, shield pipe, laptop, control/test software) enables fast measurement of critical parameters that characterize performance of tested cameras. Mode no 1 is used to measure a series of parameters listed directly by the standard IEC 80601-2-59: uncertainty of camera external blackbody, camera temporal drift, camera measurement spatial non uniformity, camera measurement instability. Measurement of these parameters makes possible to calculate total measurement uncertainty of temperature of large size blackbody type targets similar to human forehead. Mode no 2 is used to measure a series of parameters that describe system ability to measure accurately temperature of small size blackbody type targets like inner canthus or are commonly accepted to describe general performance of thermal cameras like: ATF1 (aperiodic transfer function), MRTD (minimal resolvable temperature difference), NETD (noise equivalent temperature difference). The first parameter is not directly recommended or defined by IEC 80601-2-59 but the standard sets some recommendations on size of camera pixel in order to enable accurate measurement of temperature of small targets like eye inner canthus. The second parameter is directly recommended by IEC 80601-2-59 standard that proposes measurement using another ASTM standard. Finally, the third parameter is not recommended by IEC 80601-2-59 but it was included to proposed list as it it a very popular parameter used to characterize thermal cameras.

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