Acidimeter combining microstructure fiber and microfluidic control
A microstructure optical fiber, acidity meter technology, applied in color/spectral characteristic measurement, material analysis by optical means, phase influence characteristic measurement, etc. , The effect of compact structure and volume reduction
Pending Publication Date: 2018-08-03
CHINA JILIANG UNIV
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Problems solved by technology
At present, the electronic acidity meter (pH meter) occupies the main market because of its easy operation and significant price advantage. Its basic principle is to measure the potential difference generated by hydrogen ions between the glass electrode and the comparison electrode. For pH measurement, it is not conducive to real-time online detection of the liquid to be tested
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[0012] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0013] See attached figure 1 , a pH meter combining microstructured optical fiber and microfluidic control consists of broadband light source (1), single-mode optical fiber (2), microstructured optical fiber (3), fiber optic spectrometer (4), long period fiber grating (5), sensitive membrane (6), sample inlet conduit (7) and sample outlet conduit (8); the broadband light source (1) is connected to the left end of the microstructure fiber (3) through a single-mode fiber (2), and the microstructure fiber (3) The right end is connected to the fiber optic spectrometer (4) through a single-mode optical fiber (2); wherein, both ends of the microstructured optical fiber (3) are dislocated and welded to the single-mode optical fiber (2), and part of the air holes of the microstructured optical fiber (3) are exposed and The hole wall is coate...
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Abstract
The invention discloses an acidimeter combining microstructure fiber and microfluidic control. The acidimeter is formed by a broadband light source, single-mode fibers, the microstructure fiber, a fiber optic spectrometer, a long-period fiber grating, a sensitive membrane, a sample feeding guide pipe and a sample discharging guide pipe. The long-period fiber grating is firstly inscribed on a fibercore of the microstructure fiber, then a polyvinyl alcohol / polyacrylic acid composite membrane is deposited in an air hole of the microstructure fiber, and the air hole is used as a microfluidic passage for online detecting the pH (Potential of Hydrogen) of a to-be-detected sample; change of a refraction index of the polyvinyl alcohol / polyacrylic acid composite membrane is caused by the pH degreeof the to-be-detected sample, and the wavelength of a transmission peak of the long-period fiber grating shifts along with the change of the refraction index, so that an optic acidimeter which is novel in structure is formed. The acidimeter disclosed by the invention has the prominent advantages of high sensitivity and compact structure, and an online detection solution which is capable of realizing multi-point measurement is obtained.
Description
technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a pH meter combining microstructure optical fiber and microfluidic control. Background technique [0002] The measurement and control of pH has a wide range of applications in the fields of biochemistry, clinical chemistry and environmental science. At present, the electronic acidity meter (pH meter) occupies the main market because of its easy operation and significant price advantage. Its basic principle is to measure the potential difference generated by hydrogen ions between the glass electrode and the comparison electrode. For pH measurement, it is not conducive to real-time online detection of the liquid to be tested. [0003] In recent years, the optical fiber pH sensor has attracted the attention of researchers at home and abroad due to its small size, low cost, short response time, and easy online detection. It has great application potential i...
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IPC IPC(8): G01N21/41G01N21/25G01N21/01
CPCG01N21/01G01N21/25G01N21/41G01N2201/08G01N2021/0112
Inventor 包立峰陈旭科董新永
Owner CHINA JILIANG UNIV