IC697MEM731
IC697MEM731
IC697MEM731
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其中，R表示挥测器的灵敏度；ε为辐射体的辐射率，定标时一般取1；α为与大气衰减距离有关的常数。
2.测温系统整体设计
红外测温仪的系统主要由光学系统、光电转换、信号处理、显示输出等部分组成。光学系统完成视场大小的确定，热释电探测器用将聚焦在探测器上的红外能量转换成电信号，经过放大、滤波后进行模／数转换，并送至单片机进行信号处理，液晶显示单元显示出被测目标的温度值。
3.信号处理电路设计
当光信号经过热释电传感器后，就变为交变的脉冲信号，热释电传感器接收到的人体辐射信号很微弱，只有微伏或纳微伏数量级，故需要放大后才能进行信号处理。
本系统把信号的放大电路分为前置放大电路和后级放大电路进行处理。前置放大器必须是高增益和低噪声的，高增益是用来把微弱信号放大到一定电平，以便进一步再作处理，低噪声是为了保持尽可能高的信噪比。
放大电路采用低失调精密运算放大芯片LM358，其内部包括有两个独立的、高增益、内部频率补偿的双运算放大器，适合于电源电压范围很宽的单电源使用，也适用于双电源工作模式。系统的信号放大电路如图1所示。
集成运放LM358特点是低失调、低噪声、低漂移，广泛用于精密仪器放大器、传感放大器等场合。红外传感信号由LM358的引脚3端口进入放大电路，电容C1用于滤除信号中的直流信号，电路可调电位器Rv1用来对传感器输出信号的增益进行调节。引脚端口将放大后的红外传感信号送往信号采集电路单元进行模／数转换。
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