FIELD: photo equipment.
SUBSTANCE: invention relates to photometry, and concerns passive infrared line target. Target includes line elements of different sizes. Line elements are made in form of rectangular frames with rotating screening plates installed into them. Screening plates are made with double-sided emitting coating, having maximum and minimum emissivity factors. Plates axes of rotation are installed in metal frames longitudinal walls openings. On frame longitudinal wall outer side plates turning mechanism is arranged, providing possibility of each plate synchronous rotation around its axis at any angle in range from 0° to 360° and their fixation in this position.
EFFECT: technical result consists in expansion of dynamic range, increasing in measurements accuracy and efficiency.
1 cl, 5 dwg
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