TY - JOUR AU - Seiya Nagaoka, AU - Islam Mohammad Raihanul, AU - Kenji Okajima, AU - Ryoei Ito, AU - Ken Watanabe, AU - Tetsu Ito, PY - 2018/02/27 Y2 - 2024/03/29 TI - EVALUATION OF ATTENUATION OF ULTRASONIC WAVE IN AIR TO MEASURE CONCRETE ROUGHNESS USING AERIAL ULTRASONIC SENSOR JF - GEOMATE Journal JA - INTERNATIONAL JOURNAL OF GEOMATE VL - 14 IS - 42 SE - Articles DO - UR - https://geomatejournal.com/geomate/article/view/972 SP - 158-163 AB - <p>In Japan, the total length of the main concrete agriculture irrigation canals is estimated to be<br>about 50,000 km. These canals deteriorate over time and most of the canal surface has become rough. One<br>method of measurement of the roughness of the concrete surface is by the aerial ultrasonic sensor. As far as<br>the literature is concerned, no study of the use of 42-kHz sensors for the evaluation of ultrasonic attenuation<br>during air propagation has been conducted. The aim of this study is to evaluate and correct the attenuated values<br>of an ultrasonic wave. In this paper, the reflected wave of the ultrasonic wave was measured under different<br>conditions of temperature, humidity, and atmospheric pressure with a smooth board and a rough board. These<br>were corrected by using the ISO9613-1 equation. It is concluded that the relative error of the corrected value<br>is small when compared with the measured value. The results of this study reveal that correction using the<br>ISO9613-1 equation for attenuation of the 42-kHz ultrasonic wave is an effective method.</p> ER -