Contents

Instruments and Experimental Techniques

Vol. 66, No. 5, 2023

Optical Reflectometry, Metrology, and Sensing. Present and Future (Review)

M. A. Taranov, B. G. Gorshkov, A. E. Alekseev, Yu. A. Konstantinov, A. T. Turov, F. L. Barkov, Zinan Wang, Zhiyong Zhao, Mohd Saiful Dzulkefly Zan and E. V. Kolesnichenko p. 713  abstract

Coherent Optical Frequency Reflectometry Based on a Fiber Self-Scanning Laser: Current Status and Development Prospects (Review)

A. Yu. Tkachenko, I. A. Lobach and S. I. Kablukov p. 730  abstract

ELECTRONICS AND RADIO ENGINEERING

A Simple Radiophotonic Device for Instantaneous Frequency Measurement of Multiple Microwave Signals Based on a Symmetrical Unequal Comb Generator

A. V. Maltsev, O. G. Morozov, A. A. Ivanov, A. Zh. Sakhabutdinov, A. A. Kuznetsov and A. A. Lustina p. 737  abstract

GENERAL EXPERIMENTAL TECHNIQUE

Enhancing the Temperature-Measurement Efficiency in the Brillouin Optical Time-Domain Reflectometry (BOTDR) Fiber Sensor with the K-nearest Neighbor (K-NN) Algorithm

Ahmed Sabri Kadhim Almoosa, Mohd Saiful Dzulkefly Zan, Mohd Faisal Ibrahim, Norhana Arsad, Mohd Hadri Hafiz Mokhtar, Ahmad Ashrif A. Bakar and Yu. A. Konstantinov p. 745  abstract

A Modification of the Backward Correlation Method for the Brillouin Frequency Shift Accurate Extraction

F. L. Barkov and Yu. A. Konstantinov p. 753  abstract

Method for Increasing the Signal-to-Noise Ratio of Rayleigh Back-Scattered Radiation Registered by a Frequency Domain Optical Reflectometer Using Two-Stage Erbium Amplification

M. E. Belokrylov, D. Claude, Yu. A. Konstantinov, P. V. Karnaushkin, K. A. Ovchinnikov, V. V. Krishtop, D. G. Gilev, F. L. Barkov and R. S. Ponomarev p. 761  abstract

Creation of Adaptive Algorithms for Determining the Brillouin Frequency Shift and Tension of Optical Fiber

I. V. Bogachkov p. 769  abstract

Experimental Investigations Into Characteristics of Mandelshtam–Brillouin Scattering in Single-Mode Optical Fiber of Various Types

I. V. Bogachkov and N. I. Gorlov p. 775  abstract

Refinement Method of Frequency Shift Definition of Spectrum Obtained at Low Resolution of Analyzer

B. I. Valeev, T. A. Agliullin and A. Zh. Sakhabutdinov p. 782  abstract

Study of Sensitivity Distribution Along the Contour of a Fiber-Optic Sensor Based on a Sagnac Interferometer

T. V. Gritsenko, N. V. Dyakova, A. A. Zhirnov, K. V. Stepanov, R. I. Khan, K. I. Koshelev, A. B. Pnev and V. E. Karasik p. 788  abstract

A Distributed Acoustic Sensor with a 120-km Sensing Range Based on a Phase-Sensitive Optical Time-Domain Reflectometer and a Remotely Pumped Erbium-Doped Fiber Amplifier

A. S. Dudin, D. R. Kharasov, E. A. Fomiryakov, S. P. Nikitin, O. E. Nanii and V. N. Treshchikov p. 795  abstract

Investigation of Signal Reception–Transmission Parameters in a Distributed Acoustic Sensor

A. T. Turov, F. L. Barkov, M. E. Belokrylov, D. Claude and Yu. A. Konstantinov p. 802  abstract

Comparison of Time and Frequency Approaches to Simulation of Signals of Optical Rayleigh Reflectometers

N. A. Ushakov and L. B. Liokumovich p. 809  abstract

Estimation оf Measurement Error оf Attenuation Coefficient of Optical Fibers in Rayleigh’s Scattering Reflectometry

I. V. Frolov p. 817  abstract

Active Thermostatting of the Reference Optical Fiber Section Method in a Distributed Fiber-Optical Temperature Sensor

A. O. Chernutsky, R. I. Khan, T. V. Gritsenko, K. I. Koshelev, A. A. Zhirnov and A. B. Pnev p. 824  abstract

PHYSICAL INSTRUMENTS FOR ECOLOGY, MEDICINE, AND BIOLOGY

Investigation of the Optimal Parameters of the Distributed Fiber Microphone Circuit Based on φ-OTDR for Speech Recognition

M. V. Orlova, T. V. Gritsenko, A. A. Zhirnov, Yu. A. Konstantinov, A. T. Turov, A. B. Pnev and V. E. Karasik p. 832  abstract

A Low-Noise Fiber Phase-Sensitive Optical Time-Domain Reflectometer for Seismology Application

A. E. Alekseev, B. G. Gorshkov, D. A. Il’inskii, V. T. Potapov, D. E. Simikin, M. A. Taranov p. 837  abstract

A Fiber Phase-Sensitive Optical Time-Domain Reflectometer for Engineering Geology Application

A. E. Alekseev, B. G. Gorshkov, V. T. Potapov, M. A. Taranov and D. E. Simikin p. 843  abstract

Application of a Distributed Acoustic Sensor for Seismic Surveys in Shallow Waters With Fiber-Optic Bottom-Laid Streamer

A. E. Alekseev, B. G. Gorshkov, D. A. Il’inskii, V. T. Potapov, D. E. Simikin and M. A. Taranov p. 849  abstract

Possibilities and Prospects for the Use of Distributed Fiber Sensors in Geophysics

S. P. Nikitin, K. V. Kislov, Yu. O. Starovoit, D. M. Bengalskii, E. P. Spiridonov, D. R. Kharasov, E. A. Fomiryakov, O. E. Nanii and V. N. Treshchikov p. 854  abstract

Modeling the Optical Scheme of a Position-Sensitive Luminescent Spark Sensor with a Spectral Radiation Converter

I. M. Pleshanov and A. O. Belorus p. 860  abstract

Evaluation of the Capabilities of Distributed Acoustic Sensing with a Helical Fiber for Cross-Well Seismic Survey

A. V. Chugaev and A. I. Kuznetsov p. 868  abstract

LABORATORY TECHNIQUE

Tin (IV) Oxide Coatings with Different Morphologies on the Surface of a Thinned Quartz Fiber for Sensor Application

D. P. Sudas and P. I. Kuznetsov p. 875  abstract

Manufacturing Quartz Hollow Fibers: Solution to the Problem of Stability in the Drawing of Capillaries

V. P. Pervadchuk, D. B. Vladimirova and A. L. Derevyankina p. 881  abstract