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1 March 2010 Detection of underwater no-reflection object using stimulated Brillouin scattering
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A novel practical method for detection of underwater no-reflection object is introduced. We adopt a Faraday isolator and a Glan prism as the signal isolation and extraction subsystem, which can strengthen the returned signal by using the phase conjugation characteristic of stimulated Brillouin scattering and interrupt other reflected light with small aperture. Qualitatively, a Fabry-Pérot étalon is used to determine the presence or absence of the underwater object by observing the absence of the stimulated Brillouin scattering light corresponding interference rings. Quantitatively, we use a photodiode to receive and an oscilloscope to display the returned signal to determine the interval that can be used to calculate the object's depth. Thus, we can observe the signals in the time domain and the frequency domain simultaneously. Some numerical calculation results concerning the system's longitudinal resolution are given and the corresponding influences are discussed. A 10-m-long water pipe is used in the experiments. An underwater no-reflection object located at a maximal depth of 8 m is detected and the results agree well with the real condition.
©(2010) Society of Photo-Optical Instrumentation Engineers (SPIE)
Zhigang Zhao, Jun Chen, Chong Liu, Zhen Xiang, Lixian Huang, and De Xu "Detection of underwater no-reflection object using stimulated Brillouin scattering," Optical Engineering 49(3), 036001 (1 March 2010).
Published: 1 March 2010

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