Frontiers of Optoelectronics >
Detecting NO--3 concentration in nitrate solutions using terahertz time-domain spectroscopy
Received date: 18 Apr 2014
Accepted date: 18 Jul 2014
Published date: 13 Feb 2015
Copyright
In this paper, we employed terahertz time domain spectroscopy (THz-TDS) to investigate the nitrate () concentration in four types of nitrate solution (sodium nitrate, aluminum nitrate, calcium nitrate and magnesium nitrate). Their absorption coefficient and refractive index were calculated in 0.2–2.5 THz, and a logarithmic relationship was observed between NO-3 concentrations and selected optical parameters regardless of the kinds of nitrate solution. Partial least square (PLS) model was built between THz-TDS and NO-3 concentration. The correlation coefficient of PLS model was calculated. The results make the quantitative analysis of NO-3 concentration possible by THz-TDS and indicate the bright future in practical application.
Key words: terahertz time-domain spectroscopy (THz-TDS); nitrate; solution
Qian LI , Honglei ZHAN , Fangli QIN , Wujun JIN , Honglan LIU , Kun ZHAO . Detecting NO--3 concentration in nitrate solutions using terahertz time-domain spectroscopy[J]. Frontiers of Optoelectronics, 2015 , 8(1) : 62 -67 . DOI: 10.1007/s12200-014-0437-z
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