Mr. Yachao Cai Profile

Yachao Cai

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Proceedings Article | 9 October 2021 Poster + Paper

Detection of electrolyte elements in human blood based on laser-induced breakdown spectroscopy

Yuanhang Wang, Yang Bu, Yachao Cai, Xiangzhao Wang

Proceedings Volume 11900, 1190032 (2021) https://doi.org/10.1117/12.2602525

KEYWORDS: Laser induced breakdown spectroscopy, Sodium, Liquids, Blood, Potassium, Wavelet transforms, Plasma, Laser spectroscopy

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Laser induced breakdown spectroscopy (LIBS) is a rapid and simple detection method with almost no sample preparation. In this paper, LIBS was used to detect the electrolyte elements Na and K in human blood. The liquid drop method and evaporation method were used to improve the LIBS detection capability. The polynomial fitting method and wavelet transform method were proposed to optimize the LIBS spectrum. The results showed that, the signal to background ratio (SBR) of Na Ⅰ 588.99nm spectral line increased by 20.57 times after use the methods, and the SBR of K Ⅰ 766.49nm increased 24.65 times. The intensity of Na Ⅰ 588.99nm spectral line obtained by liquid drop method is 1.05 times higher than evaporation method, and 194.08 times higher than direct detection the human blood through test tube. The intensity of K Ⅰ 766.49nm spectral line obtained by liquid drop method is 2.41 times high than evaporation method. According to the results, LIBS is suitable for the detection of electrolyte elements Na and K in human blood. The polynomial fitting method and wavelet transform method can greatly increase the SBR of Na Ⅰ 588.99nm and K Ⅰ 766.49nm in human blood. The liquid drop method can greatly improve the LIBS detection capability of electrolyte elements Na and K in human blood. Compared with the existing blood electrolyte elements detection methods, liquid drop method is more efficient and easier to operate.

Proceedings Article | 9 October 2021 Poster + Paper

Spatial characteristics of spectral intensity of laser induced plasma

Chenwei Sun, Yang Bu, Yuanhang Wang, Fang Wu, Yachao Cai, Xiangzhao Wang

Proceedings Volume 11904, 119041C (2021) https://doi.org/10.1117/12.2602775

KEYWORDS: Plasma, Optical simulations, Electrons, Particles, Ions, Laser induced breakdown spectroscopy, Signal detection, Laser ablation, Ionization, Aluminum

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System parameters are important factors that affect the spatial characteristics of laser induced plasma spectral intensity. In this paper, a two-dimensional LIBS model is used to study the effects of laser incident angle and laser energy on the spatial characteristics of spectral intensity. The model is mainly based on fluid dynamics and SAHA equation. In the research, the best laser incidence angle, the best spectrum detection angle of the system under different parameters are obtained. The variation trend of the spectral intensity of laser plasma with the detection angle under different parameters is studied. The results show that 0° is the best incident angle for 1064 nm laser with different delay time and different delay conditions. When the incident angle is 0°, the excited plasma radiation has a stronger spectral signal at different detection angles. Corresponding to the incident angle of 0°, the optimal detection angles are ±41°, ±11° and ±12° at 100 ns, 500 ns and 1000 ns delay conditions, respectively. The simulation results also show that the signal intensity of the plasma radiation spectrum increases and then decreases at the optimal detection angle with the decrease of the absolute value of the detection angle. The experiments have verified the simulation results.

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