光干涉膜阻隔红外线的研究

Study on Infrared Barrier of Optical Interference Films

研究了光学干涉膜对光的选择性,根据其厚度会影响最大反射峰,采用在一个干涉膜上叠加另一个或多个不同厚度的干涉膜,制成梯度干涉膜,能形成更宽的反射带,可阻隔更多的红外线。采用自制的隔热效果测试装置对梯度干涉膜的隔热效果进行了测定。结果表明,干涉膜反射光的波长范围主要由其厚度决定,随着光学厚度的增加,主要反射光波波长位置逐渐从较短区域向较长区域迁移;梯度干涉膜随着梯度数的增加,反射峰叠加变宽;在红外灯照射下梯度干涉膜和空白玻璃之间的温差最高可达8℃。

Gradient interference films formed by overlaying films with different thickness were investigated using self-made equipment. It showed that the reflected wavelength range by the films was mainly determined by its thickness. With increasing optical thickness, the maximum reflecting wavelength shifted from shorter to longer wave. As the layer of the gradient film increased, the reflection band became wider. The gradient interference film exhibited a temperature difference of 8℃ compared with ordinary glass under infrared lamp radiation.