Acoustic transmission line model of one dimensional vertical resonant cavity for detecting decomposition product of sulfur hexafluoride

A technology for acoustic transmission lines and decomposition products, which is used in measuring devices, analyzing materials, analyzing fluids using sonic/ultrasonic/infrasonic waves, etc., and can solve problems such as low sealing sensitivity

Inactive Publication Date: 2018-03-16
STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST +3
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Problems solved by technology

Generally, photoacoustic cavities are divided into non-resonant and resonant. Non-resonant photoacoustic cavities seal the gas in the chamber. The sound pressure distribution in the cavity has nothing to do with the spatial position. The pressure is equal everywhere at the same time. This type of photoacoustic cavity needs to be sealed and sensitive. lower

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  • Acoustic transmission line model of one dimensional vertical resonant cavity for detecting decomposition product of sulfur hexafluoride
  • Acoustic transmission line model of one dimensional vertical resonant cavity for detecting decomposition product of sulfur hexafluoride
  • Acoustic transmission line model of one dimensional vertical resonant cavity for detecting decomposition product of sulfur hexafluoride

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Embodiment

[0082] Example: such as Figure 1 to Figure 7 Shown; an acoustic transmission line model of a one-dimensional longitudinal resonant cavity for the detection of sulfur hexafluoride decomposition products, which includes: the model establishment steps are as follows:

[0083] S1: Carry out finite element simulation of photoacoustic cell;

[0084] S2: Establish the acoustic transmission line model of the photoacoustic signal;

[0085] S3: Establish a one-dimensional longitudinal photoacoustic cavity oscillation circuit model;

[0086] S4: Analyze and process the acoustic transmission line model and the oscillation circuit model.

[0087] The finite element simulation steps in step S1 are as follows:

[0088] S11: The length of the resonant cavity is corrected, and the corrected resonant cavity length is:

[0089] L eff =L c / π;

[0090] S12: Set the optical power W=200mW, and the modulation frequency is the resonance frequency of the photoacoustic cavity:

[0091] ω=πυ / 2L eff =6675rad / s;

[009...

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Abstract

The invention discloses an acoustic transmission line model of a one dimensional vertical resonant cavity for detecting the decomposition product of sulfur hexafluoride. The model is established by the following steps: step one, simulating the finite element of a photoacoustic cell; step two, establishing an acoustic transmission line model of a photoacoustic signal; step three, establishing an oscillating circuit model of a one dimensional vertical photoacoustic cavity; and step four, analyzing and processing the acoustic transmission line model and the oscillating circuit model. The providedacoustic transmission line model has the advantages that a photoacoustic signal is enhanced through resonance, the cavity does not need to be sealed; the influence of low frequency noise can be effectively inhibited by high modulation frequency, the signal-noise ratio is better; the resonance photoacoustic cavity has the characteristics of simple manufacturing, practicality, and high sensitivity;finite element analysis of a photoacoustic cell is combined to simplify the conventional acoustic transmission line theory; a LC oscillating circuit transmission line module for a one dimensional vertical photoacoustic cavity is established so that the acoustic parameters of the photoacoustic cavity can be analyzed rapidly and visually, and theoretical guidance is provided for the designing and manufacturing of a photoacoustic cell.

Description

Technical field [0001] The invention relates to the technical field of sulfur hexafluoride decomposition product detection, in particular to a one-dimensional longitudinal resonant cavity acoustic transmission line model for sulfur hexafluoride decomposition product detection. Background technique [0002] With traditional SF 6 Compared with the partial discharge decomposition component detection method, the photoacoustic spectroscopy has the advantages of high detection sensitivity, wide detection range, no need to consume the measured gas and carrier gas, and is especially suitable for online monitoring. Especially compared with infrared absorption spectroscopy, both have many similar advantages. [0003] However, the gas cell required by photoacoustic spectroscopy is much smaller than that of infrared spectroscopy. In addition, for infrared absorption spectroscopy, limited by the length of the gas cell, the detection must be performed at the strong characteristic absorption line...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/036
CPCG01N29/036G01N2291/021
Inventor 姚强何国军印华唐炬曾福平邱妮苗玉龙周艳玲胡晓锐张施令宫林籍勇亮
Owner STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST
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