Measurements of Normal Incidence Reflection Loss as a Function of Temperature at the Water-Castor Oil Interface SCIE SCOPUS

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Title
Measurements of Normal Incidence Reflection Loss as a Function of Temperature at the Water-Castor Oil Interface
Author(s)
Han, Dong-Gyun; Seo, Him-Chan; Cho, Sungho; Choi, Jee Woong
KIOST Author(s)
Cho, Sungho(조성호)
Alternative Author(s)
조성호
Publication Year
2019-08
Abstract
Reflection loss at the water-castor oil interface as a function of temperature was measured in a direction normal to the interface using a 200-kHz acoustic signal. The acoustic impedance of water increases with temperature, whereas that of castor oil decreases. The measured reflection losses varied from 30 to 65 dB, and a sharp rising peak in reflection loss was observed at the temperature at which the acoustic impedance of water became equal to that of castor oil. This temperature is called the temperature of intromission in this paper. These measurements were compared with the model predictions based on a Rayleigh-reflection model using the measured sound speeds of both fluids. The sound speeds in water and castor oil as functions of temperature are the input parameters of the Rayleigh-reflection model, and were measured directly using an arrival time difference method in the temperature range of 5 to 30 degrees C. The comparison results imply that temperature is an important factor affecting the reflection at the interface separating the two fluids.
ISSN
1424-8220
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/562
DOI
10.3390/s19153289
Bibliographic Citation
SENSORS, v.19, no.15, 2019
Publisher
MDPI
Keywords
acoustic measurements; reflection loss; temperature of intromission; acoustic impedance; water-castor oil interface
Type
Article
Language
English
Document Type
Article
Publisher
MDPI
Related Researcher
Research Interests

Underwater Acoustic Modeling,Signal Processing,Underwater Target Detection,수중음향모델링,신호처리,수중표적탐지

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