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About

This software is dedicated for treatment of experimental measurements of plasma data.
In case of any questions please contact Dr.Yifei ZHU.

Email: Yifei.zhu.plasma@gmail.com

About

PASSKEy - 02/2021

A two-dimensional drift-diffusion fluid equation solver for low temperature plasmas code generator

Created by Yifei ZHU - yifei.zhu.plasma@gmail.com

Improved by teams from:
Atelier des Plasmas Co, Ltd., Hefei, China
Xi\'an Jiaotong University, Xi\'an, China
Ecole Polytechnique, Paris, France

Permission to use PASSKEy is granted, provided that proper reference is made in any publications making use of the
code generated with this software. For specific usage and cooperations please contact the author.

Abel inversion of a 1D radial profile

Recover the local emission coefficient ε(r) from a measured line-of-sight profile I(y).

PlasmAbel 是一款在线 Abel 变换工具，用于等离子体与燃烧光学诊断。相机记录的是沿视线积分的光强，对轴对称放电（等离子体射流、流注、单根细丝、火焰），Abel 逆变换可由此还原局部发射系数 ε(r)，即真正具有物理意义的量。工具基于 PyAbel，由西安交通大学朱益飞教授团队与等离子体计算工坊开发维护。

PlasmAbel performs forward and inverse Abel transforms for plasma and combustion optical diagnostics. A camera integrates emission along each line of sight; for an axisymmetric source the inverse transform recovers the local emission coefficient. Seven inversion methods are available, with regularization for noisy data and a two-band mode that converts N₂ line ratios into the reduced electric field E/N.

I(y) = 2 ∫ ε(r) r dr / √(r² − y²)

[1] D. Hickstein, S. Gibson, R. Yurchak, D. Das, M. Ryazanov, "A direct comparison of high-speed methods for the numerical Abel transform," Rev. Sci. Instrum. 90, 065115 (2019).

[2] C. J. Dasch, "One-dimensional tomography: a comparison of Abel, onion-peeling, and filtered backprojection methods," Appl. Opt. 31, 1146 (1992).

[3] A. Paris et al., "Intensity ratio of spectral bands of nitrogen as a measure of electric field strength," J. Phys. D 38, 3894 (2005).

Input data

Drop a file here or click to browse two numeric columns: radius, intensity

391.4 nm — N₂⁺ first negative

394.3 nm — N₂ second positive

Two images or profiles of the same discharge taken through different filters, sampled on the same radial grid.

No data at hand? Input template

Transform settings

Direction

Method

Smoothing (regularization)

Only BASEX supports smoothing.

Point spacing dr

Input quantity

Symmetry centre

More options

Subtract background Average quadrants (lowers noise) Normalize to [0,1] (drops units) Clip negative values to zero

Export

Result

Measured — line-of-sight projection

Transformed — local emission coefficient

Method comparison

Working…