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Experimental device and method for detecting oh concentration by using sdbd and emission spectrum

A technology of emission spectroscopy and experimental equipment, applied in the field of ions, can solve the problems of complex technology for detecting the absolute concentration of active species, non-concentrated plasma areas, expensive experimental equipment, etc., and achieve convenient and easy optical signal acquisition process, centralized area, The effect of expanding the range of optical signal collection

Active Publication Date: 2019-10-11
DALIAN UNIV OF TECH
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Problems solved by technology

[0005] In order to solve the problems of complex technology for detecting the absolute concentration of active species, expensive experimental equipment, non-concentrated plasma regions, and difficult control, the present invention proposes an experimental device and method for detecting OH concentration using SDBD and emission spectrum

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  • Experimental device and method for detecting oh concentration by using sdbd and emission spectrum
  • Experimental device and method for detecting oh concentration by using sdbd and emission spectrum
  • Experimental device and method for detecting oh concentration by using sdbd and emission spectrum

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[0021] specific implementation plan

[0022] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] The experimental device for detecting OH concentration using SDBD and emission spectrum is mainly composed of ring-type SDBD generator 1, power supply system 2, gas supply system 3, ultraviolet light source system 4, and emission spectrum diagnosis system 5; ring-type SDBD generator 1 is composed of a linear high-voltage electrode 101, a tubular ground electrode 102, a quartz dielectric tube 103, and a branch tube 104; the linear high-voltage electrode 101 is a metal cylinder, and the length is 10-30 cm shorter than the quartz dielectric tube 103; one end of the quartz dielectric tube 103 Open, the other end is closed and has a branched pipe 104); the outer surface of the quartz dielectric tube 103 has an axial semicircular groove, and its diameter is consistent with the diameter of the linear high-v...

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Abstract

The invention discloses an experimental device and an experimental method for detecting OH concentration by utilizing SDBD (Surface Dielectric Barrier Discharge) and emission spectrum and belongs to the technical field of plasma. The experimental device is mainly composed of a circular line-line type SDBD generator (1), a power system (2), an air supply system (3), an ultraviolet source system (4) and an emission spectrum diagnosis system (5). The method comprises the following steps: generating surface dielectric barrier discharge plasma by nanosecond pulses power supply excitation, and detecting the absolute concentration of OH free radical in the plasma by utilizing the ultraviolet source and emission spectrum technology. When the absolute concentration of OH is detected, only the emission spectrum of ultraviolet light is detected, then the emission spectrum of the ultraviolet light passing through a discharge plasma area is detected, and finally, the absolute concentration of OH free radical is calculated. According to the device and method disclosed by the invention, the defects in the traditional technology that the operation is complicated, the equipment is expensive and the like when the absolute concentration of active species is detected can be overcome.

Description

technical field [0001] The invention belongs to the field of plasma technology. In particular, it relates to an experimental device and method for detecting the absolute concentration of OH radicals in the plasma, which is excited by a nanosecond pulse power supply or a sinusoidal AC power supply to generate dielectric barrier discharge plasma along the surface, and uses ultraviolet light source and emission spectrum technology. [0002] technical background [0003] In recent years, discharge plasma has received extensive attention and research due to its extensive applications in material modification, sterilization, and pollutant treatment. In the atmospheric pressure air discharge with simple equipment and convenient application, the discharge plasma can generate a large number of active nitrogen groups and active oxygen groups, such as N 2 (C), N 2 (B), N 2 (A), OH, O, O 3 Wait. These active species, especially OH in active oxygen groups, play an important role in p...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/63G01N21/67
Inventor 王文春赵紫璐杨德正袁皓张丽王森
Owner DALIAN UNIV OF TECH
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