FIELD: instrumentation engineering. SUBSTANCE: device has two modulators one of which is provided with diaphragm and is free to stay locked intwo positions which enables full coverage or partial opening of detector angle of vision. Other modulator has disk with three diaphragm orifices which is free to turn and stay in four locked positions enabling full coverage of detector field of vision, full opening of field of vision, and two different degrees of partial coverage of detector field of vision. EFFECT: improved design. 7 dwg
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