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Long-gap streamer pilot discharge conversion instantaneous gas density measurement system and method

A pilot discharge and gas density technology, applied in the field of ion plasma diagnosis, can solve problems such as difficulty in adapting to gas density measurement, small changes in gas density, and difficulty in accurate measurement, etc., to achieve flexible and convenient control and adjustment, fewer optical devices, and improved spatial resolution rate effect

Active Publication Date: 2021-04-27
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0023] Aiming at the above-mentioned problems that the long air gap discharge current injection-leader conversion process lasts for a short time, there is randomness in the moment of occurrence, the change of gas density is small, and it is difficult to measure accurately, the purpose of the present invention is to provide a long gap streamer pilot discharge conversion Instantaneous gas density measurement system and method
The invention can realize the accurate inversion measurement of ns-level instantaneous gas density distribution law in the streamer-leader discharge conversion process, has the advantages of high system reliability and capture efficiency, and solves the problem of low temporal and spatial resolution of existing M-Z interference and schlieren imaging methods 、 Difficult to adapt to the problem of gas density measurement in streamer-leader discharge transformation stochastic process

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  • Long-gap streamer pilot discharge conversion instantaneous gas density measurement system and method

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[0060] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0061] A long-gap streamer pilot discharge conversion instantaneous gas density measurement system, such as figure 1 As shown, it includes LED chip 2, beam expander lens 3, main lens 41, converging lens 42, knife edge 5, telephoto lens 6 and ICCD camera 7 arranged in sequence along the optical path direction; wherein, the LED chip 2 is driven by a pulse current Source 1 is driven to generate light pulses. Using a pulse driving current source combined with an LED chip to form a high-intensity pulse light source solves the problem that the traditional quantitative schlieren method uses a constant po...

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Abstract

The present invention relates to a long-gap streamer pilot discharge conversion instantaneous gas density measurement system and method, comprising an LED chip, a beam expander lens, a main lens, a converging lens, a knife edge, a telephoto lens and an ICCD camera arranged in sequence along the optical path direction; A discharge area is generated between the main lens and the converging lens, and the lens is coupled and the self-luminescence generated by the discharge is focused and transferred into the photomultiplier tube, which converts the time-domain signal of the discharge self-luminescence light intensity into a voltage waveform and inputs TTL pulses to form circuit, the output end of the TTL pulse forming circuit is connected to the input end of a digital delay generator, and the output end of the digital delay generator is respectively connected to a pulse driving current source and an ICCD camera. The invention can realize the accurate inversion measurement of ns-level instantaneous gas density distribution law in the streamer-pilot discharge conversion process, and has the advantages of high system reliability and capture efficiency.

Description

technical field [0001] The invention relates to a system and method for measuring instantaneous gas density of long-gap streamer pilot discharge conversion, specifically a measurement system and method for instantaneous gas density in the dark zone of long-gap streamer-pilot discharge conversion, which belongs to high-voltage test technology The field of discharge plasma diagnostics. Background technique [0002] Long air gap discharge usually refers to the air discharge phenomenon with a length of 1 m to tens of m. Long air gap discharge is the basis of research on external insulation configuration and lightning protection of power system. Streamer discharge and leader discharge are two discharge electron processes that dominate long air gap breakdown. Streamer discharge is composed of many discharge branches with low equivalent conductivity, and the free electrons generated provide energy for the formation of the leader. The pilot discharge is a thermal ionization phenom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N9/24
CPCG01N9/24
Inventor 贺恒鑫程晨肖佩肖冕章志远何俊佳边凯袁召陈立学
Owner HUAZHONG UNIV OF SCI & TECH
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