光谱学与光谱分析 |
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Surface Plasmon Resonance Spectral Based Fiber Optic Sensor for Detection of Total Dissolved Solids in Water Quality Analysis |
FENG Li-hang, ZENG Jie, LIANG Da-kai*, LIU Hong-yue |
State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China |
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Abstract As surface plasmon resonance (SPR) spectrum is sensitive to refractive index of the mediums, we explored its sensitivity characteristic of ions composition detection in a solution so as to measure the total dissolved solid value in water. Seven ionic (NaCl, KCl, CaCl2, MgCl2, Na2CO3, MgSO4 and ZnSO4) and 3 non-ionic (glucose, glycerol and sucrose) liquid samples were studied experimentally with a fiber optic SPR sensor. The influence of ion concentration on the resonance wavelength shift in SPR spectrum was investigated and discussed, and with that, the response curves were established to realize the detection of total dissolved solid in water quality analysis. The FO-SPR sensor spectral curve for TDS measurement was in conformity with ionic conductivity in 8 different water samples, and results show that the spectral method was better in high ion concentration detection of water. This research will broaden the SPR application in the field of water quality monitoring.
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Received: 2012-04-30
Accepted: 2012-07-10
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Corresponding Authors:
LIANG Da-kai
E-mail: liangdk@nuaa.edu.cn
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