FIELD: medical engineering. SUBSTANCE: luminescent adding which re-radiate light falling onto side surface from a source are brought into the core of proximal section of light guide. Radiation is trapped into complete internal reflection and is transmitted to distal end of light guide for radiation and to the end of proximal section for controlling intensity of radiation by means of photodetector device. EFFECT: improved truth of information; improved efficiency of the device. 5 cl, 1 dwg
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