Minimum Resolvable Temperature Difference
MRTD of English " M inimum R esolvable T emperature D ifference" is translated into French by Différence of Température Minimale Résolvable (or Perceptible, according to the authors). The MRTD is used to characterize the infra-red cameras. It is the smallest difference in temperature which one can distinguish with the eye on a screen of visualization of the camera when this one is placed opposite a thermal Mire. To measure the MRTD of a camera, one places this one at the exit of a Collimateur team of a black Corps differential and of a wheel of test cards placed at his hearth on which are moved up various test cards 4 bars of space frequencies different. The test cards 4 bars approved for the measurement of the MRTD are composed of 4 slits of width L and spaced same distance L . The length of the bars must make 7 L . While varying the temperature of the differential black body, compared to the temperature of the test card, one determines for each test card of the wheel of test cards, a difference in minimal temperature résolvable. The thermal cameras are in general characterized by the curve giving the evolution of the MRTD according to the angular space frequency of the test card, expressed in cycles/mrad.
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