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Portable arc-seeded microwave plasma torch

A microwave plasma and plasma technology, applied in the direction of plasma, ion implantation plating, arc welding equipment, etc., can solve the problems of torch plasma size limitation, depending on the airflow velocity, etc.

Inactive Publication Date: 2007-08-22
斯潘塞 P 郭
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the size of the torch plasma produced with such a module is limited by the electrode gap and largely depends on the gas flow velocity

Method used

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  • Portable arc-seeded microwave plasma torch
  • Portable arc-seeded microwave plasma torch
  • Portable arc-seeded microwave plasma torch

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Embodiment Construction

[0030] The present invention includes novel methods and apparatus for producing microwave plasma torches. The following description is provided to enable any person skilled in the art to make and use the invention, and is provided in the context of their particular application and technical requirements thereof. Various modifications to the specific embodiments disclosed will be readily apparent to those skilled in the art, and the general principles set forth below can be applied to other embodiments and applications. Therefore, the invention is not intended to be limited to the particular embodiments shown.

[0031] In the following, the functions performed by the present invention are presented in §4.1. The device structure constructed according to the invention is then described in §4.2. Thereafter, the operation of the device is described in §4.3. Finally, conclusions about the invention are described in §4.4.

[0032] §4.1 Function

[0033] The present invention can...

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Abstract

Arc plasma torch generated by a torch module installed on the bottom wall in the narrow section of a tapered S-band rectangular cavity, is used to seed microwave discharge where the microwave electric field is maximum. This tapered cavity is designed to support TE103 mode. With seeding, only low Q cavity and moderate microwave power (time average power of 700 W) are needed. The microwave-enhanced discharge increases the size, cycle energy, and duty cycle of the seeding arc-torch plasma considerably. This torch can be run stably without introducing gas flow or run just using airflow. Adding airflow can increase not only the size of the torch plasma but also its cycle energy, which may reach a plateau of about 12 J / per cycle for the airflow rate exceeding 0.393 l / s. This microwave plasma torch may have a radius of about 1.25 cm or more, a height of about 5 cm, and a peak electron density exceeding 5*10<13>cm<-3>. This torch may produce an abundance of reactive atomic oxygen, and therefore may be used in applications for rapidly destroying a broad spectrum of chemical and biological warfare (CBW) agents.

Description

[0001] government fund [0002] This invention was made with Government support and the Government has certain rights in the invention awarded by the Air Force Office of Scientific Research (AFOSR) under Grant No. AFOSR-F49620-01-1-0392. technical field [0003] The present invention generally relates to atmospheric pressure plasma generating devices (or "plasma sources"). In addition, the present invention also relates to the application of said microwave plasma torch, and the feasibility of an expansion device capable of synchronously generating multiple torches. Background technique [0004] Atmospheric pressure plasma sources are used in applications that require direct exposure of the plasma to an open space. Such applications include spraying and material synthesis (see, for example, the article: M.I.Boulos et al., "Basics and Applications of Thermal Plasmas", Vol.1, Plenum Press, 1994, pp. 33-47 and pp. 403-418 ( hereinafter referred to as "Boulos article"); and "Th...

Claims

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Application Information

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IPC IPC(8): B23K9/00H01J7/24C23C14/00C23C16/00C23F1/00
CPCH05H1/30
Inventor 斯潘塞·P·郭
Owner 斯潘塞 P 郭
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