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Proceedings Paper

Research on ship wake detection mechanism based on optical backscattering effect
Author(s): Donghua Zhu; Xiaohui Zhang; Jionghui Rao; Sheng Jin; Kai Liu
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Paper Abstract

The characteristic of an incident light beam scattered from underwater bubble cluster was investigated and a Monte Carlo model was employed to simulate the backscattered signal from bubbly wake by laser pulses. An optical ship wake detecting experimental system was designed and built, in which there was a frequency doubling and Q-switched YAG solid state laser adopted in the transmitter as the light source, and a telescope system with large limiting aperture and small field-of-view(FOV) in the receiver. A photomultiplier tube was employed as the detector while simulated bubbly ship as the detecting targets. The optimization of the system's parameters was studied in lab, the results showed that The influence of laser pulse energy and the FOV size of receiving optical system on the detecting effect was studied by experiments. The results showed that for near targets with small optical depth(ι ⪅1.4), the optimized Signal-to-Noise Ratio(SNR) is obtained using a laser with single pulse energy of 60mJ~4;84mJ while for far targets with large optical depth(ι⪆2.0), the optimized SNR is obtained using a laser with single pulse energy of 108mJ or above. Good detecting effect is achieved using a receiving optical system with the FOV of 4°.

Paper Details

Date Published: 12 October 2010
PDF: 8 pages
Proc. SPIE 7656, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 765678 (12 October 2010); doi: 10.1117/12.866008
Show Author Affiliations
Donghua Zhu, Naval Univ. of Engineering (China)
Xiaohui Zhang, Naval Univ. of Engineering (China)
Jionghui Rao, Naval Univ. of Engineering (China)
Sheng Jin, Units 91550, Navy (China)
Kai Liu, Naval Univ. of Engineering (China)


Published in SPIE Proceedings Vol. 7656:
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment
Yudong Zhang; Jose M. Sasian; Libin Xiang; Sandy To, Editor(s)

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