Ablating soot extinction characteristics diagnosis using laser induced incandescence and light extinction methods

Weiping, 刘卫平 Liu; Zhiliang, 马志亮 Ma; Zhenrong, 张振荣 Zhang; Menglian, 周孟莲 Zhou; Chenghua, 韦成华 Wei

doi:10.3788/hplpb20152704.41018

Cited by 2 publications

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“…The efficiency and quality of laser processing of carbon fiber reinforced plastics (CFRP) and the effectiveness of a laser to render a CFRP target nonfunctional are closely related to the interaction mechanism between the laser and CFRP [2][3][4]. The gas plumes have great influences on the physicochemical processes during laser-CFRP interaction, such as the heat released in exothermic gas-phase reactions [4][5][6][7], the heat transfer of gas plumes [5,8], the changes to surface oxidation kinetics [8], the propagation of the laser through these evolving gas plumes [9], and so on. 3 Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

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Characteristics and influences of plume during CW laser-CFRP interaction under tangential gas flow

Nan¹,

Li²,

Pan³

et al. 2020

Laser Phys.

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The characteristics of plumes during continuous wave laser irradiation of laminated carbon fiber reinforced plastics (CFRP) under tangential air flow or nitrogen gas flow are investigated. The temperature of the plume is measured by the infrared thermal imager. The change in relative mass concentration of the plume is studied by the laser extinction method. The front surface emissivity-corrected temperature maps of CFRP are measured by the infrared thermal imager to estimate the influences of plumes. The highest temperature in the plume is closely related to the absorption of the laser by the plume rather than the combustion effects of the plume. The differences of the plumes, temperature, the material surface temperature and the heat affect zone, under the two different kinds of gas flows, are all due to the effect of the burning of the plume under air flow. As the mass concentration of plumes decreases, these differences gradually disappear or no longer increase. The results of this work can be referenced for the application of the laser processing and the laser damage.

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Section: Introductionmentioning

confidence: 99%

“…The corrected expression for the recovery temperature is given. Liu studies the shielding effect of the plume on laser in the interaction process between CW laser and CFRP [9]. The normalized mean mass extinction coefficient values of plume are measured using the laser induced incandescence and laser extinction methods.…”

Section: Introductionmentioning

confidence: 99%