Water quality on-line detection system and detection method based on liquid core waveguide
A detection system and liquid core waveguide technology, applied in the fields of spectral analysis and photoelectric detection, can solve the problems of complex production steps and high cost, and achieve the effects of simple structure, high feasibility, and improved detection accuracy
Pending Publication Date: 2021-07-30
CHINA JILIANG UNIV
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The optical fiber sensor has compact structure, high detection accuracy and sensitivity, but the disadvantage is that the detection signal is greatly affected by the fluctuation of light source intensity and the change of connector loss, and the production steps are relatively complicated and the cost is high
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[0016] The present invention will be described in detail below in conjunction with specific embodiments and examples, and the advantages and various effects of the present invention will be presented more clearly. These specific embodiments and examples are used to illustrate the present invention, not to limit the present invention.
[0017] See attached figure 1 In the diagram of the experimental device in the middle, when measuring, the light beam emitted from the light source (1) is transmitted to the liquid core waveguide (3) through the input multimode fiber (2), and the water sample to be tested enters the liquid core from the water sample inflow hole (4) The waveguide (3) absorbs the light beam, and then flows out from the water sample outflow hole (5), and the absorbed light beam enters the spectrometer (7) through the output multimode fiber (6), and uses the spectrometer to convert the electrical signal into digital The signal is output to the computer (8) for proce...
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Abstract
The invention relates to a water quality online detection system and a detection method based on liquid core waveguide. The system comprises a broadband light source, an input multimode optical fiber, a liquid core waveguide tube, a water sample inflow hole, a water sample outflow hole, an output multimode optical fiber, a spectrograph and a computer, a light beam emitted from the light source is transmitted to the liquid core waveguide tube through the input multimode optical fiber, meanwhile, a water sample to be detected flows through the liquid core waveguide tube, the light beam is absorbed, the absorbed light beam enters the spectrograph through the output multimode optical fiber, an electric signal is converted into a digital signal by the spectrograph, and the digital signal is output to the computer; three important indexes for indicating the water quality can be obtained through signal analysis, wherein the three indexes include the water chromaticity, the chemical oxygen demand and the organic matter content; according to the invention, the liquid core waveguide tube wall has a refractive index lower than that of water, a waveguide structure with a total internal reflection effect is formed, detection light is bound in the waveguide tube, the path length of interaction of light and substances is increased, the transmission loss of optical signals is reduced, and the sensitivity of the detector is improved.
Description
technical field [0001] The invention relates to the technical field of spectral analysis and photoelectric detection, in particular to an online water quality detection system and detection method based on a liquid core waveguide. Background technique [0002] Water environment monitoring and evaluation is the basic means to control water pollution and prevent water environment degradation. [0003] Compared with traditional chemical analysis, electrochemical analysis and chromatographic analysis, the water quality detection based on spectral analysis technology has the advantages of simple operation, no consumption of chemical reagents, good repeatability, high measurement accuracy and rapid detection. Fast and convenient online monitoring of water samples. [0004] Water quality detection methods based on optical fiber sensors have been widely used. The optical fiber sensor has a compact structure and high detection accuracy and sensitivity, but the disadvantage is that ...
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IPC IPC(8): G01N21/31G01N21/01
CPCG01N21/01G01N21/31
Inventor 陈慧芳樊帆胡天柔
Owner CHINA JILIANG UNIV