彩票12

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新聞動態

雷達式微波探測器
簡介  雷達式微波探測器是一種將微波收、發設備合置的探測器,工作原理基于多普勒效應。微波的波長很短,在1mm~1000mm之間,因此很容易被物體反射。微波信號遇到移動物體反射后會產生多普勒效應,即經反射后的微波信號與發射波信號的頻率會產生微小的偏移。此時可認為報警產生。  原理  采用多普勒雷達的原理,將微波發射天線與接收天線裝在一起。使用體效應管作微波固態振蕩源,通過與波導的組合,形成一個小型的
幕簾探測器
幕簾探測器的原理及應用  一、被動紅外探測器的原理  被動熱釋電紅外探測器簡稱被動紅外探測器,在電子防盜、人體探測器領域中,被動紅外探測器(簡稱PIR,Passiveinfra-redDetectors)的應用非常廣泛,因其價格低廉、技術性能穩定而應用到各個領域。  理論上,自然界中的一切物體,只要它的溫度高于絕對零度(-273.15℃),其表面就會不斷地輻射紅外線。不同溫度的物體,其釋放的紅外能
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