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Telecommunications and Radio Engineering
SJR: 0.203 SNIP: 0.44 CiteScore™: 1

ISSN Печать: 0040-2508
ISSN Онлайн: 1943-6009

Выпуски:
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Telecommunications and Radio Engineering

DOI: 10.1615/TelecomRadEng.v72.i15.80
pages 1439-1452

PHYSICAL BASIC OF BUILDING ACTIVE ACOUSTO-THERMOMETERS

Oleg Sytnik
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine
S. A. Masalov
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085, Ukraine
A. I. Logvinenko
A. Usikov Institute of Radio Physics and Electronics; A.I. Kalmykov's Center of Earth radiophysic sounding, National Academy of Sciences and National Space Agency of Ukraine, 12, Ak. Proskury Str., Kharkiv, 61085, Ukraine
G. I. Klochko
A. Usikov Institute of Radio Physics and Electronics; A.I. Kalmykov's Center of Earth radiophysic sounding, National Academy of Sciences and National Space Agency of Ukraine, 12, Ak. Proskury Str., Kharkiv, 61085, Ukraine

Краткое описание

The present paper discusses the problem of detecting and identifying the heat transfer processes in living tissues using a noninvasive ultrasound technique. An optimal method, which is optimal in terms of maximum of likelihood, is proposed to detect the temperature variations within an internal layers of the living tissue when the latter is locally heated. An algorithm for estimating the spatial distribution of temperature gradients is based upon the measurement of the phase difference of ultra-sound low-power signals reflected from the inhomogeneities of tissues as well as upon the calculations of temperature increment in terms of estimated variations in delays of a received signal. The properties of signals returned from different tissues are examined. The ultrasound velocity for different temperatures and the salt composition of a specimen under study is estimated. The key factors affecting the magnitude of a meter error are studied. The arrangement of a device designed to investigate the heat transfer processes in living tissues is developed. A digital part of the device consists of phase and amplitude channels. The phase channel is used to make estimates of temperature gradients, whereas the amplitude channel serves as an auxiliary means of searching localized inhomogeneities and determining their spatial characteristics. Results of the algorithm simulation are given. The specific features of its performance in real interference situation are discussed.


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