{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,27]],"date-time":"2025-10-27T20:48:19Z","timestamp":1761598099428,"version":"build-2065373602"},"reference-count":48,"publisher":"MDPI AG","issue":"15","license":[{"start":{"date-parts":[[2019,7,26]],"date-time":"2019-07-26T00:00:00Z","timestamp":1564099200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100003566","name":"Ministry of Oceans and Fisheries","doi-asserted-by":"publisher","award":["20150340"],"award-info":[{"award-number":["20150340"]}],"id":[{"id":"10.13039\/501100003566","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>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 \u00b0C. The comparison results imply that temperature is an important factor affecting the reflection at the interface separating the two fluids.<\/jats:p>","DOI":"10.3390\/s19153289","type":"journal-article","created":{"date-parts":[[2019,7,26]],"date-time":"2019-07-26T08:45:39Z","timestamp":1564130739000},"page":"3289","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Measurements of Normal Incidence Reflection Loss as a Function of Temperature at the Water-Castor Oil Interface"],"prefix":"10.3390","volume":"19","author":[{"given":"Dong-Gyun","family":"Han","sequence":"first","affiliation":[{"name":"Department of Marine Science &amp; Convergence Engineering, Hanyang University ERICA, Ansan 15588, Korea"}]},{"given":"Him-Chan","family":"Seo","sequence":"additional","affiliation":[{"name":"Department of Marine Science &amp; Convergence Engineering, Hanyang University ERICA, Ansan 15588, Korea"}]},{"given":"Sungho","family":"Cho","sequence":"additional","affiliation":[{"name":"Department of Marine Security and Safety Research Center, Korea Institute of Ocean Science and Technology, Busan 49111, Korea"}]},{"given":"Jee Woong","family":"Choi","sequence":"additional","affiliation":[{"name":"Department of Marine Science &amp; Convergence Engineering, Hanyang University ERICA, Ansan 15588, Korea"}]}],"member":"1968","published-online":{"date-parts":[[2019,7,26]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1099","DOI":"10.1190\/1.1440881","article-title":"Boundary conditions for the numerical solution of wave propagation problem","volume":"43","author":"Reynolds","year":"1978","journal-title":"Geophysics"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"289","DOI":"10.1190\/1.1451800","article-title":"Reflection and transmission of waves at a fluid\/porous-medium interface","volume":"67","author":"Denneman","year":"2002","journal-title":"Geophysics"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"705","DOI":"10.1190\/1.1441945","article-title":"A nonreflecting boundary condition for discrete acoustic and elastic wave equations","volume":"50","author":"Cerjan","year":"1985","journal-title":"Geophysics"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"3513","DOI":"10.1143\/JJAP.41.3513","article-title":"Acoustic Wave Reflection from Water-saturated and Air-saturated Sediments","volume":"41","author":"Kimura","year":"2002","journal-title":"Jpn. J. Appl. Phys."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"739","DOI":"10.1121\/1.1641020","article-title":"A beam tracing method for interactive architectural acoustics","volume":"115","author":"Funkhouser","year":"2004","journal-title":"J. Acoust. Soc. Am."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"659","DOI":"10.1121\/1.1903305","article-title":"Sound transmission in the porpoise head","volume":"56","author":"Norris","year":"1974","journal-title":"J. Acoust. Soc. Am."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"07KA02","DOI":"10.7567\/JJAP.55.07KA02","article-title":"Introduction of measurement techniques in ultrasonic electronic: Basic principles and recent trends","volume":"55","author":"Mizutani","year":"2016","journal-title":"Jpn. J. Appl. Phys."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"83","DOI":"10.1016\/0041-624X(85)90037-X","article-title":"Acoustic impedance matching of medical ultrasound transducers","volume":"23","author":"Persson","year":"1985","journal-title":"Ultrasonics"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"149","DOI":"10.1121\/1.386692","article-title":"Reflection of acoustic waves at a water-sediment interface","volume":"70","author":"Stoll","year":"1981","journal-title":"J. Acoust. Soc. Am."},{"key":"ref_10","unstructured":"Frisk, G.V. (1994). Ocean and Seabed Acoustics: A Theory of Wave Propagation, Pearson Education."},{"key":"ref_11","unstructured":"Jensen, F., Kuperman, M., and Schmidt, H. (1993). Computational Ocean Acoustics, American Institute of Physics."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"221","DOI":"10.1121\/1.1908019","article-title":"Reflection of Sound from Coastal Bottoms","volume":"32","author":"Mackenzie","year":"1960","journal-title":"J. Acoust. Soc. Am."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"2948","DOI":"10.1143\/JJAP.35.2948","article-title":"Reflection of Plane Acoustic Waves at a Seawater-Marine Sediment Interface","volume":"35","author":"Kimura","year":"1996","journal-title":"Jpn. J. Appl. Phys."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"EL128","DOI":"10.1121\/1.2963048","article-title":"Observations of the R reflector and sediment interface reflection at the Shallow Water \u201906 Central Site","volume":"124","author":"Choi","year":"2008","journal-title":"J. Acoust. Soc. Am."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"1831","DOI":"10.1121\/1.1511198","article-title":"Normal incidence reflection loss from a sandy sediment","volume":"112","author":"Chotiros","year":"2002","journal-title":"J. Acoust. Soc. Am."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"2724","DOI":"10.1121\/1.4777432","article-title":"Direct observation of the angle of intromission in marine sediments","volume":"110","author":"Holland","year":"2001","journal-title":"J. Acoust. Soc. Am."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"2283","DOI":"10.1121\/1.4920332","article-title":"The angle of intromission in muddy sediments: Measurements and inferences","volume":"137","author":"Holland","year":"2015","journal-title":"J. Acoust. Soc. Am."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"454","DOI":"10.1109\/JOE.2002.1040930","article-title":"Coupled Scattering and Reflection Measurements in Shallow Water","volume":"27","author":"Holland","year":"2002","journal-title":"IEEE J. Ocean. Eng."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"2731","DOI":"10.1121\/1.407356","article-title":"A coherent ray model of plane-wave reflection from a thin sediment layer","volume":"94","author":"Chapman","year":"1993","journal-title":"J. Acoust. Soc. Am."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"980","DOI":"10.1109\/JOE.2004.834178","article-title":"Mid-to-High Frequency Bottom Loss in the East China Sea","volume":"29","author":"Choi","year":"2004","journal-title":"IEEE J. Ocean. Eng."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"07GG01","DOI":"10.1143\/JJAP.51.07GG01","article-title":"Geoacoustic Inversion of Mid-Frequency Bottom Loss Data in Shallow Water off the East Coast of Korea","volume":"51","author":"Lee","year":"2012","journal-title":"Jpn. J. Appl. Phys."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"1205","DOI":"10.1121\/1.5092609","article-title":"Measurements of mid-frequency bottom-interacting signals and geoacoustic inversion in Jinhae Bay, Southeast Korea","volume":"145","author":"Kwon","year":"2019","journal-title":"J. Acoust. Soc. Am."},{"key":"ref_23","unstructured":"Kinsler, L.E., Fray, A.R., Coppens, A.B., and Sanders, J.V. (1999). Fundamentals of Acoustics, John Wiley Sons, Inc."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"292","DOI":"10.1016\/S0924-4247(00)00431-3","article-title":"Low frequency underwater piezoceramic transducer","volume":"85","author":"Chilibon","year":"2000","journal-title":"Sens. Actuators A Phys."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"121","DOI":"10.1109\/58.212560","article-title":"Tonpilz Piezoeletric Transducers with Acoustic Matching Plates for Underwater Color Image Transmission","volume":"40","author":"Inoue","year":"1993","journal-title":"IEEE Trans. Ultrason. Ferroelectr. Freq. Control"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"1751","DOI":"10.1121\/1.1913023","article-title":"A New Capped-Cylinder Design for an Underwater Sound Transducer (USRD Type F50)","volume":"51","author":"Tims","year":"1972","journal-title":"J. Acoust. Soc. Am."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"459","DOI":"10.7837\/kosomes.2018.24.4.459","article-title":"Experiment and Simulation of Acoustic Detection for the Substitute for Sunken Hazardous and Noxious Substances Using the High Frequency Active Sonar","volume":"24","author":"Han","year":"2018","journal-title":"J. Korean Soc. Mar. Environ. Saf."},{"key":"ref_28","unstructured":"Han, D.G., Choi, J.W., and Son, S.U. (2017, January 27\u201328). Tank experiment and simulation of sunken hazardous and noxious substances detection using high frequency active sonar. Proceedings of the Regional Conference on Acoustics and Vibration 2017 (RECAV 2017), Bali, Indonesia."},{"key":"ref_29","unstructured":"Han, D.G., Seo, H.C., Choi, J.W., Lee, M., and Hwang, H.J. (2018, January 29\u201331). Observation of the Temperature of Intromission at Water-Castor Oil Interface. Proceedings of the 39th Symposium on UltraSonic Electronics (USE 2018), Tokyo, Japan."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"1","DOI":"10.4137\/LPI.S40233","article-title":"Castor Oil: Properties, Uses, and Optimization of Processing Parameters in Commercial Production","volume":"9","author":"Patel","year":"2016","journal-title":"Lipid Insights"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"14","DOI":"10.1121\/1.412332","article-title":"Causal theories and data for acoustic attenuation obeying a frequency power law","volume":"97","author":"Szabo","year":"1995","journal-title":"J. Acoust. Soc. Am."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"1879","DOI":"10.1121\/1.388673","article-title":"Sound absorption based on ocean measurements. Part II: Boric acid contribution and equation for total absorption","volume":"72","author":"Francois","year":"1982","journal-title":"J. Acoust. Soc. Am."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"1442","DOI":"10.1121\/1.1913258","article-title":"Speed of Sound in Pure Water","volume":"52","author":"Mader","year":"1972","journal-title":"J. Acoust. Soc. Am."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"989","DOI":"10.1121\/1.1913205","article-title":"Speed of Sound in Castor Oil","volume":"52","author":"Timme","year":"1972","journal-title":"J. Acoust. Soc. Am."},{"key":"ref_35","doi-asserted-by":"crossref","unstructured":"Lurton, X. (2010). An Introduction to Underwater Acoustics, Springer. [2nd ed.].","DOI":"10.1007\/978-3-642-13835-5"},{"key":"ref_36","unstructured":"Potter, M.C., Wiggert, D.C., and Ramadan, B.H. (2011). Mechanics of Fluids, Cengage learning. [4th ed.]."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"1609","DOI":"10.1121\/1.406819","article-title":"Speed of sound in pure water as a function of temperature","volume":"93","author":"Bilaniuk","year":"1993","journal-title":"J. Acoust. Soc. Am."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"7","DOI":"10.1016\/0025-3227(91)90031-X","article-title":"Measuring suspended sediment concentrations using acoustic backscatter devices","volume":"98","author":"Thorne","year":"1991","journal-title":"Mar. Geol."},{"key":"ref_39","unstructured":"Medwin, H., and Clay, C.S. (1998). Fundamentals of Acoustical Oceanography, Academic Press."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1093\/icesjms\/fsq093","article-title":"5-MHz acoustic-backscattering measurements of Cochlodinium polykrikoides blooms in Korean coastal waters","volume":"67","author":"Kim","year":"2010","journal-title":"ICES J. Mar. Sci."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"639","DOI":"10.1121\/1.384722","article-title":"Ray path analysis of sediment shear wave effects on bottom reflection loss","volume":"68","author":"Vidmar","year":"1980","journal-title":"J. Acoust. Soc. Am."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"3305","DOI":"10.1121\/1.423970","article-title":"Benchmark solutions of plane wave bottom reflection loss","volume":"104","author":"Ainslie","year":"1998","journal-title":"J. Acoust. Soc. Am."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"301","DOI":"10.1088\/0026-1394\/38\/4\/3","article-title":"Recommended table for the density of water between 0 \u00b0C and 40 \u00b0C based on recent experimental reports","volume":"38","author":"Tanaka","year":"2001","journal-title":"Metrologia"},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"1666","DOI":"10.1109\/TUFFC.2009.1231","article-title":"Measurement of Broadband Temperature Dependent Ultrasonic Attenuation and Dispersion Using Photoacoustic","volume":"56","author":"Treeby","year":"2009","journal-title":"IEEE Trans. Ultrason. Ferroelectr. Freq. Control"},{"key":"ref_45","first-page":"799","article-title":"Determination of the Variation in Free-Field Hydrophone Response with Temperature and Depth","volume":"88","author":"Beamiss","year":"2002","journal-title":"Acta Acust. United Acust."},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"281","DOI":"10.1088\/0026-1394\/36\/4\/6","article-title":"Temperature dependence of the sensitivity of hydrophone standards used in international comparisons","volume":"36","author":"Buren","year":"1999","journal-title":"Metrologia"},{"key":"ref_47","unstructured":"Meribout, M., Habli, M., Al-Naamany, A., and Al-Busaidi, K. (2004, January 18\u201320). A New Ultrasonic-based device for Accurate Measurement of Oil, Emulsion, and Water Levels in Oil Tanks. Proceedings of the IEEE Instrumentation and Measurement Technology Conference, Como, Italy."},{"key":"ref_48","doi-asserted-by":"crossref","unstructured":"Lipper, A., and Borden, J. (2012, January 14\u201319). Urethane Transducer Encapsulation versus Oil Filled Boot Encapsulation of Piezoelectric Transducers. Proceedings of the 2012 OCEANS, Hampton Roads, VA, USA.","DOI":"10.1109\/OCEANS.2012.6404874"}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/19\/15\/3289\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T13:09:54Z","timestamp":1760188194000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/19\/15\/3289"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2019,7,26]]},"references-count":48,"journal-issue":{"issue":"15","published-online":{"date-parts":[[2019,8]]}},"alternative-id":["s19153289"],"URL":"https:\/\/doi.org\/10.3390\/s19153289","relation":{},"ISSN":["1424-8220"],"issn-type":[{"type":"electronic","value":"1424-8220"}],"subject":[],"published":{"date-parts":[[2019,7,26]]}}}