AC/225(Panel VI )WP/61(3rd revise)
NOTE 1: The MRTD measured at a given temperaturecan be converted to the MRTD at other temperatures, if required. The conversion factor depends of the spatial response of the thermal imager and has to be determined separately.
MEASUREMENT CONDITIONS
5.1. The observer shall have normal visual acuity (post-correction defects less than ± 0 25 dioptres) and good colour vision and be experienced in +his type of measurement.
5.2.a. The targets shall be plates containing four (4) parallel slots, effectively forming a four (4) bars three (3) spaces test pattern as shown at Figure 1. The targets are positioned in front of a black body of which the temperature can be varied, thus giving a temperature difference (ΔT) between the bars and the spaces.
