朝阳本特利 3500/34 传感器
价格：99.00起
电感式本特利传感器由振荡、检波、放大、触发及输出电路等组成。振荡器在传感器检测面产生一个交变电磁场，当金属物体接近传感器检测面时，金属中产生的涡流吸收了振荡器的能量，使振荡减弱以至停振。振荡器的振荡及停振这两种状态，转换为电信号通过整形放大转换成二进制的开关信号，经功率放大后输出。
本特利传感器通用型接近传感器的工作原理：振荡电路中的线圈L产生一个磁场。当目标物接近磁场时，由于电磁感应在目标物中产生一个感应电流(涡电流)。随着目标物接近传感器，感应电流增强，引起振荡电路中的负载加大。然后，振荡减弱直至停止。传感器利用振幅检测电路检测到振荡状态的变化，并输出检测信号。
为实现防盗监测的目的，本特利传感器的几个类型可以构成多传感器防盗报警系统。热释电红外传感器：凡是存在于自然界的物体,例如人体、火焰等物体都会放射出红外线，只是其放射的红外线的波长不同而已。人体的温度为36~ 37"C,可出中心波长为9~10μm的红外线。在硅片表面上贴，上截止波长为7~ 10μm的滤光片，只允许波长超过7~10μm的红外线 通过，而小于7μm的红外线被滤除掉，于是就得到只对人体敏感的热释电红外线传感器。
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