A new method for weak signal detection with strong noise background is proposed. A scheme which combines hardware with software for realization of this method is designed. In this method, the signals are detected and processed using the classical instrument magnifying technique and single-chip microcomputer control. By means of virtual instrumentation simulation and display, this design provides effective methods to detect μA-level weak signal in pyroelectric infrared detector. Through the experiment of artificial low-frequency weak-signal detection, the system fully reveals its practicality and superiority in the field of weak signal detection.%提出新的强噪声背景下的微弱信号检测方法,设计一种硬件与软件相结合的实现方案.采用经典的仪表放大技术和单片机控制技术对数据进行检测和处理,并通过虚拟仪器技术仿真和显示,为解决热释电红外探测器中μA级微弱信号的检测提供了十分有效的方法.最后通过对模拟低频微弱信号的检测实验,充分显示该系统在微弱信号检测方面的实用性和优越性.
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