| 纳秒脉冲激光对金属丝电爆炸过程的瞬态测量方法研究 |
| |
| 引用本文： | 位永辉,王石语,吴梦瑶,蔡德芳,过振.纳秒脉冲激光对金属丝电爆炸过程的瞬态测量方法研究[J].应用光学,2019,40(6):1109-1114. |
| |
| 作者姓名： | 位永辉 王石语 吴梦瑶 蔡德芳 过振 |
| |
| 作者单位： | 西安电子科技大学 物理与光电工程学院，陕西 西安 710071 |
| |
| 基金项目： | 国防预研基金9140A020105 |
| |
| 摘 要： | 金属丝电爆炸是获取金属纳米级粉粒的有效途径，电爆炸的演绎过程直接影响金属粉颗粒的尺度范围。采用纳秒级脉冲激光对爆炸过程的瞬态进行观察，以激光干涉条纹为背景，依据电爆炸过程中，对条纹的扰动获取具有清晰边缘的爆炸区图像；再根据激光穿过爆炸云团的透过率计算出不同时刻粉尘体浓度的三维分布图。测量结果表明:通电后0.5 μs，金属丝直径由0.3 mm扩展为4.7 mm, 直到18 μs时扩展为28 mm，而粒子的最大浓度由3×1021/cm3减小为1.1×1020/cm3。整个扩展过程中，粒子浓度沿径向呈现多个环带的分布形态。
|
| 关 键 词： | 电爆炸 等离子体 激光干涉 纳米铝粉浓度 三维分布 |
| 收稿时间： | 2019-07-17 |
Transient measurement on electric explosion of metal wire by nanosecond pulsed laser |
| |
| Affiliation: | School of Physics and Optoelectronic Engineering, Xidian University, Xi'an 710071, China |
| |
| Abstract: | Electric explosion of metal wire is an effective way to obtain the nanometer-sized metal powder particles, the deductive procedure directly affects the size of the metal powder particles. Nanosecond pulsed laser was used to observe the transient state of the explosion process. And based on the laser interference fringes, the image of the explosive area with clear edge was obtained according to the interference of the fringes in the process of electric explosion. The three-dimensional distribution of the metal powder concentration at different moment was calculated according to the transmittance of laser passing through the explosive cloud. Measuring results show that, the diameter of metal wires expands from 0.3 mm to 4.7 mm by 0.5 μs after energization, and expands to 28 mm by 18 μs. The maximum concentration of particles decreases from 3×1021 /cm3 to 1.1×1020 /cm3. Throughout the expansion process, the particle concentration distribution presents the multiple ring belts along the radial direction. |
| |
| Keywords: | |
|
| 点击此处可从《应用光学》浏览原始摘要信息 |
|
点击此处可从《应用光学》下载全文 |
|
