FIELD: measuring devices. SUBSTANCE: device has capacitance transducer which output is connected to input of circuit having oscillator, amplifier and recorder connected in series. Parameters of free space, space filled with standard fiber and spaced filled with measured fiber can be adjusted in transducer. In addition device has computing unit and time delay unit. Measured parameter is determined by equation given in invention specification. EFFECT: increased precision due exclusion influence of environment. 2 cl , 2 dwg
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