The aims of this research are to design an experimental testing mechanism and process for measuring the scattering strength and the pattern induced by an underwater target. The experimental data are to compare with existing theoretical results to insure the integrity of experimental design. The experiment is conducted in a water tank of dimension 1.8 m x 1.8 m x 1 m. The main work is to measure the sound field scattered by a copper sphere of diameter 60mm. There is one type of directive source employed in this analysis: 192 kHz iTP-192k transducer as the receiver and projector. The transducer transmits sine waves with the pulse duration roughly equal to 0.143 msec (equivalent to 64 waves). The scattering field theory is based on the formulation developed by Hickling (JASA, 1962, pp.1582-1592). In order to get more precise measurement results, this research designs a high strength and accurate mechanism with a ball-ring and aluminum workpieces. The mechanism can be used to measure target scattering signals circularly with same radius. The experimental process has demonstrated that it is more difficult to measure the forward scattering field than the backward scattering field, due to the fact that the forward scattering field is likely to be mingled with the direct waves. The comparison between experimental and theoretical results shows that the discrepancy in the backward scattering sector is within 3 to 4 dB; however, generally speaking, the variation of the curves show a good agreement. These results indicate that the design of this experiment is basically practicable, and with further improvements, it could be applied to measure other underwater targets. As a whole, the thesis is composed by basic theory deduction, experimental instrumentation, mechanism design, and experiment data analysis. The emphases place on the design and observation of the scattering experiment, data analysis, and further improvement.The aims of this research are to design an experimental testing mechanism and process for measuring the scattering strength and the pattern induced by an underwater target. The experimental data are to compare with existing theoretical results to insure the integrity of experimental design. The experiment is conducted in a water tank of dimension 1.8 m x 1.8 m x 1 m. The main work is to measure the sound field scattered by a copper sphere of diameter 60mm. There is one type of directive source employed in this analysis: 192 kHz iTP-192k transducer as the receiver and projector. The transducer transmits sine waves with the pulse duration roughly equal to 0.143 msec (equivalent to 64 waves). The scattering field theory is based on the formulation developed by Hickling (JASA, 1962, pp.1582-1592). In order to get more precise measurement results, this research designs a high strength and accurate mechanism with a ball-ring and aluminum workpieces. The mechanism can be used to measure target scattering signals circularly with same radius. The experimental process has demonstrated that it is more difficult to measure the forward scattering field than the backward scattering field, due to the fact that the forward scattering field is likely to be mingled with the direct waves. The comparison between experimental and theoretical results shows that the discrepancy in the backward scattering sector is within 3 to 4 dB; however, generally speaking, the variation of the curves show a good agreement. These results indicate that the design of this experiment is basically practicable, and with further improvements, it could be applied to measure other underwater targets. As a whole, the thesis is composed by basic theory deduction, experimental instrumentation, mechanism design, and experiment data analysis. The emphases place on the design and observation of the scattering experiment, data analysis, and further improvement.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0802106-160805 |
| Date | 02 August 2006 |
| Creators | Yu, Chia-fu |
| Contributors | Jin-Yuan Liu, Bin-Bing Ma, Chau-Chang Wang |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0802106-160805 |
| Rights | unrestricted, Copyright information available at source archive |
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