Detecting NO--3 concentration in nitrate solutions using terahertz time-domain spectroscopy
Qian LI1,Honglei ZHAN2,Fangli QIN3,Wujun JIN3,Honglan LIU3,Kun ZHAO1,2,3,*( ) |
1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
2. Key Laboratory of Oil and Gas Terahertz Spectroscopy and Photoelectric Detection, China Petroleum and Chemical Industry Federation (CPCIF), Beijing 100723, China
3. Beijing Key Laboratory of Optical Detection Technology for Oil and Gas, China University of Petroleum, Beijing 102249, China |
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| Abstract
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-3concentrations 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.
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| Keywords terahertz time-domain spectroscopy (THz-TDS) nitrate solution |
| Corresponding Authors: Kun ZHAO |
| Just Accepted Date: 13 August 2014 Online First Date: 16 September 2014 Issue Date: 13 February 2015 |
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| Cite this article: |
| Qian LI,Honglei ZHAN,Fangli QIN, et al. Detecting NO--3 concentration in nitrate solutions using terahertz time-domain spectroscopy[J]. Front. Optoelectron., 2015, 8(1): 62-67. |
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