The experimental setups have been built in the use of the photothermal deflection technology and surface thermal lensing technology , respectively . the weak absorption of different optical thin films has been measured . the experimental results obtained from the above two methods were compared 4 .分别建立了表面热透镜技术和光热偏转技术测量光学薄膜微弱吸收的实验装置，对多种光学薄膜样品的微弱吸收进行了测量，并将两种方法测得的实验结果进行了比较。
In the machinery industry , the sodium citrate is widely used for replacing sodium cyaniding to clean the metal surface of heat exchanger metal surface and the chemical pipeline , because of its nonpoisonous , no pollution , high combine performance , it is good buffer and complexing agent in the electroplate industry 在机械造业中，柠檬酸纳由于无毒、无污染，高整合性能，因此广泛用于替代氰化钠，处理金属表面热交器和化工管道的清洗剂，是电镀工业良好的缓冲剂和络合剂。
Combining with the energy fluxes balance above fuel surface , the simulation and calculation of transient heat conduction of the pe fuel with liquid layer while melting and pyrolyzing are considered by use of the moving coordinates . the calculated regression rate of the pe fuel approximately tallies with the same kind of hybrid rocket motor test data from the abroad 建立了pe燃料的熔化、热解、导热模型，应用动坐标系，结合燃料表面热环境，对具有液体层的pe燃料的熔化、热解和内部瞬态导热过程进行了模拟计算，计算的pe燃料退移速率与国外同类试验的测量结果符合较好。
However , traditional methods , including spectrophotometric , extinction coefficient method , are not sensitive enough to measure absorption of thin films in the 10 ~ ( - 4 ) 10 ~ ( - 7 ) range which is often used in the modern optical system . surface thermal lens ( stl ) technique was developed by kuo and saito respectiv - ely in the early 1990s 光热技术的发展为光学薄膜微弱吸收测量提供了新的手段,表面热透镜技术( stl )作为光热技术测量光学薄膜微弱吸收的一种重要方法,在上世纪九十年代初,由kuo和saito分别提出。
In this paper , the stl technique with cw modulated top - hat beam excitation is investigated theoretically and experimentally . 1 . the theoretical model based on the fresnel diffraction integral is developed to describe the stl signal excited with the cw modulated top - hat beam for the first time to the best of our knowledge 本论文提出采用连续调制的平顶光束作为激励光的表面热透镜技术测量薄膜吸收的方法,主要开展了如下工作: 1 .建立了连续调制的平顶光束作用下样品的表面热透镜信号模型。
In former stl instruments , a laser beam with a gaussian distributed intensity was commonly used as the excitation source . nevertheless , the output of a high power laser is usually a superposition of multi - modes rather than a gaussian distribution ( tem00 ) . therefore , it is very convenient to add an aperture to get a top - hat beam 以前的表面热透镜装置中,多使用高斯光束作为激励光,但由于高功率激光器一般为多模输出,要获得严格的基模高斯光束比较困难,而平顶光束可以通过在激光器前加一定大小的光阑实现,降低了对激光光束质量的要求,更有利于实际的测量。
