IC697MEM719
IC697MEM719
IC697MEM719
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在室温下工作，不需制冷即能获得很高的灵敏度，可与低温下高灵敏度的测辐射热计相媲美。
输出阻抗是纯电容性的，直流阻抗极高。
体积小、重量轻、坚固。
因此，热释电探测器是一种很理想的红外辐射探测器，在热探测领域中占有十分重要的位置。
1.测量原理
红外测温仪的测温原理是黑体辐射定律。众所周知，自然界中一切高于零度的物体都在不停向外辐射能量，物体向外辐射能量的大小及其波长的分布与它的表面温度有着十分密切的联系，物体的温度越高，所发出的红外辐射能力越强。黑体处于温度T时，在波长为λ处的单色辐射出度由普朗克公式确定。
热释电红外传感器由陶瓷氧化物或压电晶体元件组成，元件两个表面做成电极，当传感器监测范围内温度有T的变化时，热释电效应会在两个电极上产生电荷，即在两电极之间产生微弱电压V。热释电探测器检测到变化的温度，经光电转换后，变成一个交流电压信号供信号处理电路进行处理。可由普朗克公式推导出辐射体温度的公式：
其中，T1为测目标的温度；T2为环境温度；ε1为被测目标辐射率；ε2为环境的辐射率；σ为斯忒藩-玻耳兹曼常数，且σ=5.6703×10-8W·m-2·K-4；K为表示探测器的灵敏度，且有
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