Sl is a process from molecular emission to bremsstrahlung . in the fifth chapter , we record the sl image resulted from ultrasonic cavitation and studied the relationship between the sl intensity and ultrasonic intensity 液体在超声的作用下产生的声致发光强度与驱动超声压强的大小有关，经多次试验发现液体中的超声压强与声致发光的强度近似呈线性关系。
It also analyses and compares the characteristics of bulk acoustic wave and surface acoustic wave , such as directivities and shapes . and then optical detection methods of laser - induced ultrasonic , especially cfpi detection method , are introduced 然后，介绍了激光超声的光学检测技术，并重点分析了外差干涉检测技术和共焦fabry - perot干涉检测技术的原理和特点。
Results show that , at any frequency , the mbsl field changes with the ultrasonic intensity , and the thresholds of ultrasonic pressures are increased with the ultrasonic frequency . the reason is that , the ultrasound with higher frequency needs higher pressure to make the bubbles provide enough energy to dissociate the water molecules 超声的驱动频率的大小影响气泡的膨胀比(气泡在超声作用下膨胀的最大半径最小半径) ，进而影响气泡爆破时产生的温度，导致不同频率条件下气泡地声致发光阈值不同。
Experimental result shows that cavitation can destroy metal cyanogen preparation and chemical property of bearing cyanide wastewater is changed ; it intensify the fiber ' s adsorption progress and reduce the time of adsorption equilibrium , the general cyanide adsorption rate is increased 5 % or so , but it strength the different effect on different metal - cyanide negative ions ; strengthen effect of copper cyanide complex is stronger than zinc and iron cyanide complex , so ultrasonic wave may strength the fiber ' s adsorption processes 实验结果表明，功率超声的空化作用能破坏金属氰配合物键，从而改变含氰废水的化学性质，另外也可缩短吸附平衡时间，强化纤维的吸附过程，使总氰的吸附率可提高5 %左右；功率超声对不同金属氰配合物离子的强化效果是不同的，对铜氰络离子的强化效果要强于铁氰、锌氰络离子，所以功率超声可以强化纤维的吸附过程。
On the design of the system , the thickness measure system of mems chip is built based on lbu and pump - probe technology . on the analysis of data , the reflectivity curve is analyzed using the law of reflectivity change induced by ultrasound , and the thickness is calculated using the system designed by the article , to aluminum film the size of about 20nm can be measured , when the film be measured is single layer , the relative error of the system is less than 2 % , when the film be measured is double layer , the relative error of the system is less than 10 % 在基础理论方面研究了激光(特别是超短脉冲激光)超声的激励机理，探讨了激光调制技术以提高系统信噪比，阐述了泵束探针束技术及相关实验设置；在系统设计上，以激光超声为基本原理，以泵束探针束技术为系统设计方案完成了mems基片厚度测量系统的设计；在数据分析方法上，利用声致光反射率变化的一般规律对测得的光反射率曲线进行分析，确定超声回波在薄膜两界面间来回传播的时间，以计算薄膜的厚度。
Due to the limitation of individual ability and technological condition , we still use some traditional analog technology and can not accomplish board debugging of front - end system . however , this paper is an innovative and valuable study of digital ultrasound system , which is benefit for the engineers who engage in the relative field 受个人能力与技术条件所限,最终没有实现前端系统的下板调试,并且该方案设计中仍然沿用部分模拟技术,但整体上讲仍然是对数字化超声的大胆而有益地探索,对从事相关的技术人员有一定的借鉴意义。
