CAJ | 학술논문

热释电元件输出信号幅值小，不易探测，噪声影响明显，文中对热释电红外传感器进行了噪声分析，掌握了影响系统噪声的特点。选用结型场效应管对信号进行前置低噪声放大，利用双路消噪的原理设计了二级增益可调的放大滤波电路。对处理前后的信号进行了分析，可见这样的设计消除了系统的外部噪声和内部噪声。通过搭建的测试平台，对制作好的红外传感器进行了数据处理和性能测试，验证了该设计的合理性。
열석전원건수출신호폭치소，불역탐측，조성영향명현，문중대열석전홍외전감기진행료조성분석，장악료영향계통조성적특점。선용결형장효응관대신호진행전치저조성방대，이용쌍로소조적원리설계료이급증익가조적방대려파전로。대처리전후적신호진행료분석，가견저양적설계소제료계통적외부조성화내부조성。통과탑건적측시평태，대제작호적홍외전감기진행료수거처리화성능측시，험증료해설계적합이성。
As the output signal of pyroelectric device is small and difficult to detect and the noise is relatively large,this paper analyzed the noise of pyroelectic sensor and understood the noise features about this system.This paper chose the junction field-effect transistor to perform as the low noise preamplifier and used the two-way de-noising theory to design filtering circuit.Compa-ring signals before and after the experiment,this paper found this design can eliminate the internal and external noise of the sys-tem.By building a test platform to test the data processing of the infrared sensor and its performance,this paper confirmed that this design was reasonable.