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几年来,红外探测器都无法满足二氧化碳激光器的要求,因为这种激光器的波长只能用慢的热探测器或低溫光敏器件。解决红外探测問題的一种有希望的和比较新的方法是应用热电效应。这种效应发生在某些类材料中,如铁电材料,它们具有随溫度变化影响很大的永久电极化特性。稍微改变材料的溫度,就会引起这种极化的有限变化,从而使探测器两端的电位差发生变化。铁电性的可见效应示于图1。
For years, infrared detectors have not been able to meet the requirements of carbon dioxide lasers because the wavelength of such lasers can only be used with slow heat detectors or low temperature light-sensitive devices. A promising and relatively new solution to the infrared detection problem is the application of the thermoelectric effect. This effect occurs in certain types of materials, such as ferroelectric materials, which have permanent electrical polarization properties that are greatly affected by temperature changes. A slight change in the temperature of the material causes a finite change in this polarization, which changes the potential difference across the detector. The ferroelectric visible effect is shown in Figure 1.