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我们在上学期(即1955年2月至6月)曾组织了一个科学研究小组,小组研究的题目是“利用夫累湟尔(Fresnel)圆孔衍射来进行测光波波长”的实验.在这实验里需要一个可變光欄而且这个可變光欄的好坏,对实验的结果影响很大.我们对这可變光欄的小孔要求(1)很圆,(2)在调节时孔的直径要连续缓慢的变化,(3)孔要达到很小,能小于1mm,根据上面的要求,我们首先选择了显微镜上的光欄,可是结果发现不能满足我们的要求,它不圆,孔不能缩到很小等,因此我们自己想法设计,经过了许多次的挫折,作过了好多种尝试,结果设计出一种基本上合乎我们要求的可變光欄.下面就是这种光欄的构造.
In the last semester (February to June 1955), we organized a scientific research group that studied the experiment “using Fresnel circular-aperture diffraction for photometric wavelength.” At This experiment requires a variable light bar and this variable light bar is good or bad, the experimental results have a great impact on our variable aperture hole requirements (1) is very round, (2) during adjustment According to the above requirements, we first select the light bar on the microscope, but the results found that we can not meet the requirements, it is not round, the diameter of the hole to be continuous and slow changes, (3) the hole to reach a very small, less than 1mm, The hole can not be reduced to a very small size, so we designed our own ideas, after many setbacks, made a variety of attempts, resulting in a design basically meet our requirements variable light bar. Here is the light bar The structure.