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当你使用体温计时,一定会感觉到水银柱不容易看清,因为水银的本色是银白色。如果把水银着上颜色就方便多了,但是在水银中混入着色剂要影响体温计的性能,必须另外想办法。 1979年4月在日本上市了一种水银着上蓝色的平形体温计,白色的刻度板配上蓝色的水银柱,反差极好,容易读数。平形体温计中的毛细管柱叫做芯,是由透明玻璃制成。芯内的毛细管孔直径仅为0.02毫米。为了使肉眼能看清这么细的水银柱,必须把它放大到1～1.2毫米。所以其截面如图1所示,为椭园形,起到高放大倍数的凸透镜作用。在普通体温计上,入射光线照到水银柱上后向I方向反射,人眼看到的
When you use the thermometer, you will feel the mercury column is not easy to see, because the true color of silver is silver white. If the mercury on the color of the more convenient, but mixed with mercury in the colorant to affect the performance of the thermometer, we must find another way. April 1979 in Japan, a mercury on the blue flat thermometer, white scale coupled with a blue mercury column, excellent contrast, easy to read. The capillary column in a flat thermometer is called a core and is made of clear glass. The diameter of the capillary in the core is only 0.02 mm. In order to make the naked eye can see such a thin mercury column, it must be enlarged to 1 to 1.2 mm. So its cross-section shown in Figure 1, for the elliptical shape, play a high magnification of the lens effect. On a common thermometer, the incident light shines on the mercury column and reflects in the direction of I, which the human eye can see