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Method for analyzing and simulating influence of laser line width on gas absorption spectral line in TDLAS (Tunable Diode Laser Absorption Spectroscopy)

A technology of gas absorption and simulation method, applied in the direction of color/spectral characteristic measurement, etc., to achieve the effect of improving detection ability, simple operation and improving accuracy

Active Publication Date: 2021-06-11
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0004] However, in the actual process of measuring ethylene concentration, the detection limit, sensitivity and stability of the detected ethylene concentration will be affected by many factors, among which system noise is an important factor that cannot be ignored

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  • Method for analyzing and simulating influence of laser line width on gas absorption spectral line in TDLAS (Tunable Diode Laser Absorption Spectroscopy)
  • Method for analyzing and simulating influence of laser line width on gas absorption spectral line in TDLAS (Tunable Diode Laser Absorption Spectroscopy)
  • Method for analyzing and simulating influence of laser line width on gas absorption spectral line in TDLAS (Tunable Diode Laser Absorption Spectroscopy)

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Embodiment Construction

[0041] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but the implementation scope of the present invention is not limited thereto.

[0042] Simulink is a visual simulation tool in MATLAB. It is a block diagram design environment based on MATLAB. It is a software package for dynamic system modeling, simulation and analysis. It is widely used in linear systems, nonlinear systems, digital control and In modeling and simulation of digital signal processing. Simulink provides an integrated environment for dynamic system modeling, simulation and comprehensive analysis. In this environment, there is no need to write a large number of programs, but only through simple and intuitive mouse operations, complex systems can be constructed.

[0043] Simulink simulation can be divided into two steps: create model icon → use Simulink to simulate.

[0044] Simulink is a tool for visual simulation in MATLAB. Th...

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Abstract

The invention discloses a method for analyzing and simulating influence of laser line width on gas absorption spectral lines in TDLAS (tunable diode laser absorption spectroscopy), the method mainly comprises an analysis method and a simulation method, the analysis method comprises theoretical analysis of laser line type, and theoretically, it is clear that the laser line width has influence on detected gas concentration in actual system detection; according to the simulation method, Simulink software is adopted, and simulation modeling of the laser linewidth of the detection system is carried out. According to the method, the TDLAS technology serves as the theoretical basis, the harmonic detection technology is combined, ethylene concentration detection is achieved, compared with the prior art, the mode that theoretical analysis and Simulink software are adopted for simulation modeling is adopted, the influence of the line width of a laser on gas absorption spectral lines in detection is determined, errors of experimental results are reduced, and the accuracy of the whole detection device is improved.

Description

technical field [0001] The invention relates to an ethylene detection technology, in particular to an analysis and simulation method for the influence of laser line width on gas absorption spectrum in TDLAS. Background technique [0002] With the continuous improvement of people's living standards, more and more people have higher requirements for the freshness of fruits and vegetables, and the transportation process is an important link in the preservation of vegetables and fruits. In order to ensure the freshness of fruits and vegetables during transportation, generally through Appropriately reduce the oxygen concentration to inhibit the respiration of fruits and vegetables, and at the same time appropriately change the ethylene concentration in the refrigerated environment, so as to delay the ripening and aging of fruits and vegetables. [0003] Ethylene is a natural plant hormone. It plays an important role in the process of plant flowering, fruit ripening, aging and sh...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39
CPCG01N21/39
Inventor 张锐王芳郭洪飞王燕郗风江敖乐根杨贺轩
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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