为了对宽频段高吸收率太赫兹辐射计的特性进行表征,研究了吸收涂层材料的特性;对常见的吸波材料在太赫兹波段的吸收率进行仿真,探寻在太赫兹波段具有高吸收率的材料;将碳化硅与3M黑漆进行混合,以进一步提高涂层的吸收率,并通过仿真调整涂层内碳化硅颗粒的尺寸;根据仿真结果制备混合涂层,利用太赫兹时域光谱仪对混合涂层样品进行测量。结果表明:该混合涂层样品的光谱吸收率大于0.99,与仿真结果基本吻合。

The bactericidal effect of laser radiation with a quartz fiber-based transmission system with a strong absorption coating converter against bacteria associated with urological stones has been studied. Gram-negative rod Escherichia coli and the Gram-positive coccus Staphylococcus epidermidis, Staphylococcus aureus, Enterococcus faecalis and Enterococcus faecium were used in this study. Each bacterial species was treated by continuous-wave near infrared laser coupled with bare fiber tip or strongly absorption coating fiber tip. After treatment, the temperature of bacterial suspension was measured. In addition, the temperature distribution was analyzed. It has been shown that using laser with a strongly absorption coating fiber tip results in significant bactericidal effect. The decrease of the amount of E. coli and S. epidermidis was 100% after treatment with an output power of 6W of radiation at a wavelength of 0.97 _m for 40 s. Number of S. aureus and Ent. faecium colony-forming unit was reduced to 70% after same exposure. The peak temperature of bacterial suspension was 86_C after treatment by laser with a strongly absorption coating fiber tip. Laser with a strongly absorption coating fiber tip provides large-scale hydrodynamic flows directed away from the fiber tip. The laser with a strongly absorption coating fiber tip has bactericidal effect. The main role is associated with the effect of high temperature, which, in the form of flow in a liquid medium, affects bacteria.

为了提高激光微织构加工效率和改善微织构加工质量, 采用W-71s型喷枪在GCr15轴承钢表面分别喷涂用黑漆、水玻璃、黄料、磷酸锌和石墨制备的涂层。利用Nd∶YAG激光加工机对其进行激光微织构加工, 使用3维形貌分析仪对微凹坑的形貌进行了检测。结果表明, 与无涂层试样相比, 采用水玻璃和黄料涂层试样表面蚀除凹坑体积均增加, 凹坑边缘熔渣体积均减少, 其中黄料涂层表面蚀除凹坑体积增加了29.4%, 水玻璃涂层凹坑边缘熔渣体积减少了64.9%; 在一定条件下, 复合涂层相比单一涂层具有更好的激光加工性能, 其中黄料与水玻璃复合涂层的性能最为显著, 与未经涂层的相比, 凹坑蚀除体积增加了47.1%, 凹坑边缘熔渣体积减少了43.2%。这一结果对提高激光微织构加工效率、改善微织构加工质量具有一定的指导意义。

In this paper, we consider a method of laser resection using the silica glass core from which the cladding layer has been removed as the cutting part of a laser scalpel. An absorbing layer coating the silica fiber tip markedly alters its biotissue cutting characteristics. The results of histological studies of skin after exposure to a laser scalpel with and without a strongly absorbing coating (SAC) at a wavelength of 0.97 μm show that resection using a coated scalpel is more sparing. When an uncoated scalpel was used, skin injury was more apparent in both its surface spread and the depth of structural damage, resulting in poorer tissue regeneration.

为了提高金属表面激光吸收率及激光微织构加工表面质量, 采用W-71s型喷枪在试样表面分别喷涂黑漆、水玻璃和黄料, 并用Nd∶YAG激光器对其进行激光微凹坑加工。与无涂层试样相比, 激光加工水玻璃和黄料涂层试样表面蚀除凹坑体积都增加, 其凹坑边缘熔渣体积都减少, 其中, 黄料涂层试样表面蚀除凹坑体积增加了29.4%; 在此基础上, 利用正交试验法探讨水玻璃和黄料的配比以及厚度对激光微织构加工表面蚀除凹坑体积和凹坑边缘熔渣体积的影响。结果表明, 吸光涂料的厚度控制在0.1mm左右, 黄料含量17%、水玻璃含量18%的涂料为最优涂料配方; 正交试验表中最优试样表面蚀除凹坑体积相比无涂层试样增加了70.6%, 其凹坑边缘熔渣体积减少了16.2%。该工艺显著提高了激光吸收率和激光加工表面质量。

针对全玻璃真空管与平板太阳能热水器存在系统复杂、成本高、不易维护等缺点，以及传统闷晒式热水器存在集热效率低和热损失严重等问题，提出了一种集热效率高、热损失小、成本低的基于复合抛物面-渐开线聚光的闷晒式太阳能热水器。对复合抛物面、渐开线以及复合抛物面和渐开线二者结合的聚光器进行了优化设计，制作了与该聚光系统配套的带有选择性吸收涂层的集热器水箱。最后，搭建了闷晒式热水器系统并进行了集热性能测试。结果表明，当太阳辐照强度的平均值为800 W/m2、周围环境的平均温度约为21 ℃时，闷晒式热水器可以将40 L水从21 ℃加热至62.20 ℃，系统的瞬时效率截距为0.63，热损系数为10.40 W/(m2·℃)。而传统黑色聚乙烯塑料袋闷晒式热水器的瞬时效率截距为0.31，热损系数为13.32 W/(m2·℃)，与其相比，本系统在集热效率和保温性能上有着明显的优势，完全能够满足人们的日常生活用热水，具有良好的市场前景。