FIELD: physical instruments. SUBSTANCE: device has pulse oscillator, power regulator, two emitters one of which is located in first tube, photodetector, electronic unit and recording unit. Measuring range switch, second and third tubes in which second emitter and photodetector are located are introduced to accomplish the goal of invention. EFFECT: decreased influence of noise on output signal, decreased contamination of optical elements with boundary flows, increased precision. 2 cl, 3 dwg
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