开发用于大气压等离子体装置的脉冲调制次射频电源
Aishik Basu Mallick1, G Veda Prakash1, Satyananda Kar1
1Department of Energy Science and Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.
The Review of scientific instruments
|December 20, 2023
概括
脉冲调节的无线电频率 (RF) 激发显著影响大气压等离子体喷射. 较高的电压会增加气体温度和羽毛长度,增强反应性物种和离子生成,用于各种应用.
科学领域:
- 等离子体物理学的物理学
- 非热等离子体非热等离子体
- 大气压等离子体 大气压等离子体
背景情况:
- 大气压等离子体喷射器对于各种应用至关重要.
- 了解激发参数对等离子体特征的影响至关重要.
研究的目的:
- 为了研究脉冲调制的亚射频 (sub-RF) 激发对大气压等离子体喷射特性的影响.
- 探索电压振幅和脉冲调制频率等参数如何影响等离子体特性.
主要方法:
- 开发一种专门的电源,用于控制的次射频激发 (100kHz-1MHz).
- 使用的诊断包括光学发射光谱,分子束质谱和光学成像.
- 评估了反应性物种的产生,离子组成,羽毛长度和气体温度.
主要成果:
- 气体温度和等离子羽毛长度随着应用于电压的增加而增加,分别达到325K和23毫米.
- OH•和O•的排放强度,以及正离子和负离子产量,显示电压的增量趋势.
- 获得的等离子体特性表现出kHz和RF大气等离子体的特征.
结论:
- 脉冲调节的次射频激发在控制大气压等离子体喷射特性方面提供了灵活性.
- 该研究提供了对优化等离子体特征的见解,通过调整激发参数来适应潜在的应用.
相关概念视频
01:19Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle
626
Inductively coupled plasma (ICP) is the most widely used plasma source in atomic emission spectroscopy (AES), also known as Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). The ICP source, or torch, consists of three concentric quartz tubes with argon gas flowing through them. A spark from a Tesla coil initiates the ionization of argon, generating a high-temperature plasma.
The ions and electrons produced interact with the fluctuating magnetic field created by a water-cooled...
The ions and electrons produced interact with the fluctuating magnetic field created by a water-cooled...
626
01:20Atomic Emission Spectroscopy: Overview
2.2K
Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
2.2K
01:22Atomic Emission Spectroscopy: Instrumentation
486
The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers. Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
486
01:29Atomic Emission Spectroscopy: Lab
167
AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
167
01:17NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences
809
A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
809