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Trace fluorine ion sensor and concentration detection device and method

A technology for concentration detection and fluorine ions, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of high dependence on excitation power and detector sensitivity, limit applications, etc., achieve good photocatalytic performance, great convenience, easy to manufacture film effect

Pending Publication Date: 2021-02-12
CHONGQING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, complex instrumentation, well-equipped laboratories, and well-trained personnel are major limiting factors for ion-selective electrodes and NMR spectroscopy, limiting their use in resource-constrained laboratories
Fluorescence-based detection, inexpensive and fast, but highly dependent on excitation power and detector sensitivity

Method used

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  • Trace fluorine ion sensor and concentration detection device and method
  • Trace fluorine ion sensor and concentration detection device and method
  • Trace fluorine ion sensor and concentration detection device and method

Examples

Experimental program
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Embodiment 1

[0070] Such as figure 1 as shown, figure 1 It is a schematic diagram of a sensing device. The trace fluorine ion sensor provided in this embodiment includes a single-mode optical fiber 5, a thick cone 6, a thin-core optical fiber 7, a sensitive film 8, a silver film 9 and an ultraviolet glue 10;

[0071] The single-mode optical fiber 5 and the thin-core optical fiber 7 are sequentially connected through the thick cone 6;

[0072] After the light transmitted from the single-mode fiber 5 passes through the thick cone 6, it is excited to form a core mode and a cladding mode in the thin core fiber 7; wherein, the core mode refers to the light transmitted in the core layer, and the cladding mode refers to the light transmitted in the core layer. Light transmitted in the cladding;

[0073] The sensitive film 8 is coated on the outer wall of the thin-core optical fiber 7 for absorbing fluorine ions;

[0074] The silver film 9 is arranged on the end face of the thin-core optical fi...

Embodiment 2

[0083] Such as figure 1 As shown, in this embodiment, the optical fiber Michelson interference trace fluorine ion sensor provided above is used to form a detection device for trace fluorine ion concentration, including a C+L band light source 1, a spectrum analyzer 2, a circulator 3 and a set A trace fluoride ion sensor in the sample solution 4;

[0084] The trace fluorine ion sensor includes a single-mode optical fiber 5, a thick cone 6, a thin-core optical fiber 7, a sensitive film 8, a silver film 9, and an ultraviolet glue 10;

[0085] The C+L band light source 1 is used to emit a continuous spectrum;

[0086] The spectrum analyzer 2 is used to display the sensing waveform;

[0087] The circulator 3 is used to connect a light source, a sensor and a spectrum analyzer;

[0088] The single-mode 5 optical fiber is respectively connected with the C+L band light source 1 and the spectrum analyzer 2 through the circulator 3;

[0089] The thick cone 6 is used for coupling the ...

Embodiment 3

[0095] The sensor provided in this embodiment is composed of a rough-cone Michelson interferometer packaged on the end face and an aluminum-doped zinc oxide coating. The end face is composed of silver film and ultraviolet glue. The end face reflection is enhanced through the silver film, and the ultraviolet glue protects the silver film. role.

[0096] Its working principle is:

[0097] When the light in the core of the single-mode fiber is transmitted to the thick cone, various cladding modes will be excited due to the expansion of the core. The core mode and the cladding mode are transmitted in the core and cladding of the thin-core fiber respectively. Reflected at the end face of the silver-coated optical fiber, and re-coupled at the thick cone, they interfere with each other and present an interference pattern on the spectrum analyzer; the aluminum-doped zinc oxide sensitive film specifically adsorbs fluorine ions, resulting in an effective refractive index of the cladding...

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Abstract

The invention discloses a trace fluorine ion sensor and a concentration detection device and method; the sensor is composed of an aluminum-doped zinc oxide coating layer and an optical fiber Michelsoninterferometer with a packaged end face, the end face of a thin-core optical fiber of the sensor is plated with a layer of silver film to enhance the reflection, and then the silver-plated end face is packaged with an ultraviolet curing adhesive to prevent the silver film from being oxidized. The refractive index of the aluminum-doped zinc oxide coating layer is changed through fluorine ions, sothat the interference spectrum of the sensor is changed, and the concentration of the fluorine ions can be determined according to corresponding wavelength movement. Experimental results show that thesensor can be used for detecting trace (0-50 ppb) fluorine ions, the sensitivity is as high as 57.02 pm / ppb, the performance is the best under the condition that the fluorine ion concentration is relatively low, and the sensitivity is reduced along with the increase of the fluorine concentration; in the range of 5 ppb and 50 ppb, the linearity R2 is equal to 0.97835; the response time of the sensor is 40 s; the sensor has the advantages of being high in sensitivity and selectivity, small in size, easy to manufacture, high in response speed and the like.

Description

technical field [0001] The invention relates to the technical field of fluoride ion sensors, in particular to a trace fluoride ion sensor and a concentration detection device and method. Background technique [0002] Fluorine is a trace element important to human health, mainly obtained through drinking water. It is a double-edged sword. On the one hand, it plays an important biological and medical role in the normal growth and maintenance of teeth, hair, nails and bones, as well as in the treatment of osteoporosis. On the other hand, excessive exposure to fluoride can cause dental fluorosis, skeletal fluorosis, kidney disease, and acute stomach problems; this is due to its unique properties that are easily absorbed by the body but excreted very slowly. Once present, the symptoms of fluorosis are irreversible. In terms of water safety, the World Health Organization (WHO) guideline value for fluoride is 1.5ppm, and if it exceeds 10ppm, disabling skeletal fluorosis will appe...

Claims

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Application Information

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IPC IPC(8): G01N21/45
CPCG01N21/45G01N2021/458
Inventor 杨晓占冯文林蒋毅
Owner CHONGQING UNIV OF TECH
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