System and method for measuring instantaneous gas density for conversion from long-air-gap streamer discharge to leader discharge

A pilot discharge and gas density technology, applied in the field of ion plasma diagnosis, can solve the problems of difficulty in adapting to gas density measurement, small changes in gas density, and low temporal and spatial resolution, and solve the problems of inability to adapt to the randomness of discharge, few optical devices, The effect of high spatio-temporal resolution

Active Publication Date: 2018-12-04
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

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  • System and method for measuring instantaneous gas density for conversion from long-air-gap streamer discharge to leader discharge
  • System and method for measuring instantaneous gas density for conversion from long-air-gap streamer discharge to leader discharge
  • System and method for measuring instantaneous gas density for conversion from long-air-gap streamer discharge to leader discharge

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[0061] 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.

[0062] 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 invention relates to a system and method for measuring instantaneous gas density for conversion from long-air-gap streamer discharge to leader discharge. The system includes an LED chip, a bean expanding lens, a main lens, a convergent lens, a knife edge, a telephoto lens and an ICCD camera. A discharge zone is generated between the main lens and the convergent lens. A coupling lens focuses self-luminescence generated by discharging and transmits the self-luminescence into a photomultiplier. The photomultiplier converts optical intensity time domain signals of the discharge self-luminescence into a voltage waveform and inputs the voltage waveform into a TTL pulse formation circuit. An output end of the TTL pulse formation circuit is connected to an input end of a digital delay generator, and the output end of the digital delay generator is connected to a pulse drive power supply and the ICCD camera separately. The system and the method can achieve accurate inversion measurement ofan ns-stage instantaneous gas density distribution rule in a process of conversion from long-air-gap streamer discharge to leader discharge, and have advantages of high system reliability and a high capturing 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...

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Application Information

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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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