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Optical fiber micro-air-cavity photoacoustic cell, preparation method and dissolved gas detection method

A technology of dissolved gas and photoacoustic cell, which is applied in the direction of color/spectral characteristic measurement, measuring device, and material analysis through optical means, which can solve the problem of increasing the time for dissolved gas to diffuse into the photoacoustic cell, increasing the complexity and volume of the system , reduce the detection speed of the system, and achieve the effects of low cost, simple preparation method, and reduced performance damage

Inactive Publication Date: 2020-04-14
JINAN UNIVERSITY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The headspace extraction method requires the use of carrier gas to assist the introduction of the gas to be measured into the photoacoustic cell, which increases the complexity and volume of the system. At the same time, the process of transporting the gas to the photoacoustic cell will consume part of the time and reduce the detection speed of the system; Although the perme

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  • Optical fiber micro-air-cavity photoacoustic cell, preparation method and dissolved gas detection method
  • Optical fiber micro-air-cavity photoacoustic cell, preparation method and dissolved gas detection method
  • Optical fiber micro-air-cavity photoacoustic cell, preparation method and dissolved gas detection method

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Embodiment 1

[0031] This embodiment discloses a photoacoustic cell with an optical fiber micro-air cavity. see figure 1 , figure 1 It is a schematic structural diagram of the optical fiber micro-air cavity photoacoustic cell of this embodiment. The optical fiber micro-air cavity photoacoustic cell of the embodiment of the present invention includes a transmission optical fiber 10, a quartz capillary 12, and a micro-air cavity 20;

[0032] Wherein, the transmission optical fiber 10 and the quartz capillary 12 are welded to form a fiber-capillary microstructure, the end face of the fiber-capillary microstructure is coated with a light-absorbing material 11, the transmission fiber 10 and the quartz capillary 12 are immersed in the liquid, and the micro air cavity 20 is located in the quartz capillary 12 Inside, the micro-air cavity 20 forms a Fabry-Perot cavity; the interface between the end face of the transmission fiber 10 and the liquid and the interface between the micro-air cavity 20 an...

Embodiment 2

[0046] This embodiment further proposes a method for preparing an optical fiber micro-air cavity photoacoustic cell, see further figure 2 , figure 2 It is a schematic diagram of the preparation method of the optical fiber micro-air cavity photoacoustic cell in this embodiment, and the specific steps are as follows:

[0047] Step S1, making a smooth end face on one end of the transmission optical fiber 10 with an optical fiber cutter;

[0048] Step S2. Splicing a section of quartz capillary 12 on the end face of the transmission optical fiber 10 through an optical fiber fusion splicer; under microscope observation, adjust the position of the cutting knife and the fusion point through a high-precision displacement platform, and control the length of the cut quartz capillary 12 to form an optical fiber - capillary microstructure;

[0049] Step S3, coating a layer of light-absorbing material 11 on the end surface of the fiber-capillary microstructure (in this embodiment, the l...

Embodiment 3

[0058] This embodiment further proposes a method for photoacoustic gas measurement using the optical fiber micro-air cavity photoacoustic cell produced by the above preparation method, see further image 3 , image 3 It is a schematic diagram of signal demodulation during the gas detection process of the optical fiber micro-air cavity photoacoustic cell according to the embodiment of the present invention, and the specific steps are as follows:

[0059] Step T1, the λ emitted from the pumping light source 307 1 The wavelength heating light reaches the λ of the wavelength division multiplexer 305 through the tunable optical attenuator 306 1 Wavelength input port; λ emitted by narrowband laser 301 2 The wavelength probe light and the lambda emitted by the tunable narrowband laser 302 3 The wavelength pumping light is transmitted from the first port 1 of the circulator 304 to the second port 2 after passing through the coupler 303, and reaches the λ of the wavelength division ...

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Abstract

The invention discloses an optical fiber micro-air cavity photoacoustic cell, a preparation method and a dissolved gas detection method. The optical fiber micro-air cavity photoacoustic cell comprisesan optical fiber microstructure and a micro-air cavity located on the end face of the microstructure, the optical fiber microstructure is formed by welding a section of capillary tube to one end of asingle-mode optical fiber, and the end face of the single-mode optical fiber is plated with a gold film; and the other end of the single-mode optical fiber is introduced into the laser heating gold film to vaporize surrounding liquid to form the optical fiber micro-air-cavity photoacoustic cell. The dissolved gas in the liquid diffuses into the photoacoustic cell under the driving of the solubility gradient, absorbs pump light injected into the photoacoustic cell through the single-mode optical fiber, generates a photoacoustic signal and causes gas-liquid interface deformation of the micro-gas cavity; the deformation is detected by another beam of detection light injected by the optical fiber, and the concentration of the dissolved gas to be detected is reduced by combining the gas absorption coefficient. The optical fiber micro-air-cavity photoacoustic cell is simple to prepare, low in cost and small in size, and can be used for in-situ and rapid dissolved gas detection.

Description

technical field [0001] The invention relates to the technical field of trace gas detection, in particular to an optical fiber micro-air cavity photoacoustic cell, a preparation method and a dissolved gas detection method. Background technique [0002] Trace gas detection plays an important role in industrial production, energy development, and ecological environment. Photoacoustic spectroscopy, which combines absorption spectroscopy and acoustic measurement technology, has the advantages of good selectivity, high sensitivity, large dynamic range, and compact system structure in gas detection, and has attracted extensive attention in the research field. As the core device of the photoacoustic gas detection system, the photoacoustic cell is the place where the gas to be measured absorbs the laser to generate a photoacoustic signal, which is related to the accuracy and response speed of the gas detection system. For dissolved gas detection, due to the strong absorption of liqu...

Claims

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Application Information

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IPC IPC(8): G01N21/17G01N21/31G01N21/03
CPCG01N21/03G01N21/1702G01N21/31G01N2021/1704
Inventor 马军何阳关柏鸥
Owner JINAN UNIVERSITY
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