Layanan journal yang disediakan oleh Perpustakaan Universitas Gunadarma
| Judul Artikel | : | Modification of Attenuation Rate in Range Normalization of Echo Levels for Obtaining Frequency-Dependent Intensity Data from 0.6 MHz and 1.0 MHz Devices |
|---|---|---|
| Judul Terbitan | : | JOURNAL OF ENGINEERING AND TECHNOLOGICAL SCIENCES |
| ISSN | : | 2337-5779 |
| Bahasa | : | IND |
| Tempat Terbit | : | BANDUNG |
| Tahun | : | 0000 |
| Volume | : | Vol. 45 Issue 2 0000 |
| Penerbit | : | INSTITUT TEKHNOLOGI BANDUNG |
| Frekuensi Penerbitan | : | 1 x 1 tahun |
| Penulis | : | Poerbandono ,Totok Suprijo |
| Abstraksi | : | This investigation aims to propose an attenuation rate for range normalization of echo amplitudes recorded by an acoustic backscattering instrument working at a frequency of 1.0 MHz. The intention of the use of such an attenuation rate is to obtain equal echo levels when using a device from the same family of products with a different working frequency, i.e. a 0.6 MHz instrument, at an identical site. This work is based on a field experiment with a 1.0 MHz Acoustic Wave and Current (A WAC) profiler and a 0.6 MHz Aquadopp profiler. Both profilers were deployed upward, side-by-side in the Semak Daun reef lagoon, Seribu Islands, Java Sea, Indonesia. It was found that the proposed attenuation rate for the 1.0 MHz instrument was one-order magnitude higher with respect to the one used for the 0.6 MHz instrument, and logarithmically depth dependent. The proposed attenuation rate for the 1.0 MHz A W AC is -7.92510g(R) + 8.551, with R is the slant range from the transducers to the measured layer. Accordingly, the overall agreement between the 1.0 MHz A W AC echo amplitude and the one recorded by the 0.6 MHz Aquadopp was improved by 18dB, which is quite significant considering that the average echo amplitude discrepancy recorded by each transducer was 2AdB. |
| Kata Kunci | : | acoustic backscatter; doppler-type hydro-acoustic current pro filer; field deployment; propagation loss; rate of attenuation |
| Lokasi | : | P140 |
| Terakreditasi | : | belum |