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光電管的製造有賴於稀有金屬,它是一种將光能直接變成電能的電氣儀表(註:光電管和光電詳見國立技術出版局科学普及叢書‘電眼’,B.A.美仁捷夫著)。光電管用於有声電影、電視、許多複雜生產过程的自動化以及遠距離控制設備和机器的工作。 銫和铷是用於光電管的最有趣和最重要的稀有金屬。它們都具有感光性,只要光線射在銫片的面上,铯片上就發生程度較深的物理變化。銫在光的作用下成為电能的来源,銫面上集中有電子流。電流隨着光線照射的減弱而消失。遠在1888年卓越的俄國物理学家斯多里托夫卽已發現在光的作用下產生電流的現象。光生電的現象附做光電效应,在光導体的作用下所產生的電流叫做光電。
The manufacture of a photocell relies on rare metals, an electrical instrument that converts light energy directly into electricity (Note: Photocells and photovoltaics are described in detail in the National Science Press, Science Popularize, Electric Eye, B. A. Meirentev). Photovoltaic tubes are used in the production of audio-visual films, televisions, automation of many complex production processes and the operation of remote control equipment and machines. Cesium and rubidium are the most interesting and important rare metals used in photovoltaic cells. They are all photosensitive, as long as the light incident on the surface of cesium tablets, cesium film on the occurrence of a deeper degree of physical changes. Cesium is the source of electrical energy under the action of light, and electrons are concentrated on the cesium surface. The current disappears as the light is diminished. Strutoit, the Russian physicist far superior in 1888, has discovered the phenomenon of electric current produced by the action of light. The phenomenon of photovoltaic power generation attached to the photoelectric effect, the role of the light conductor produced by the current called photoelectric.