Precision optical measurements and metrology

New optical method to study oxygen activity in flowing liquid

R. V. Davydov^a, S. È. Logunov^ab, V. D. Dudkin^b, V. V. Davydov<sup>a

a</sup> Peter the Great St. Petersburg Polytechnic University, 195251 St. Petersburg, Russia
^b St. Petersburg State University of Telecommunications, 195251 St. Petersburg, Russia

Abstract: The necessity to study the oxygen activity of aqueous media in the flowing state to solve various problems has been substantiated. It has been found that emitted $\gamma$-quanta as a result of decay of $^{16}$N nuclei with energy more than 9 MeV cause the formation of additional color centers and reversible optical defects in the fiber. Their appearance leads to increased radiation-induced losses in the optical fiber, which reduce the power of laser radiation transmitted through it. A new optical method has been developed that makes it possible to study the nature of oxygen activity change by the number of $\gamma$-quanta emitted by $^{16}$N nuclei when the liquid moves along the pipeline. For the first time, the nature of the change in the spectral distribution of the number of $^{16}$N nuclei emitted as a result of oxygen activity was investigated, and its features in the current flow were determined. In order to realize long-term studies of oxygen activity, a method was proposed to restore optical properties of fiber in the presence of background radioactive radiation.

Received: 29.09.2021
Revised: 07.12.2021
Accepted: 16.12.2021

DOI: 10.21883/OS.2022.03.52173.2765-21

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