红外传感器的微弱信号检测与处理

发布时间：2019-06-11 20:33

【摘要】：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。
[Abstract]:The output signal amplitude of pyroelectric element is small, it is not easy to detect, and the influence of noise is obvious. In this paper, the noise analysis of Pyroelectric infrared sensor is carried out, and the characteristics that affect the noise of the system are mastered. The junction field effect tube is selected to amplify the signal with low noise, and the amplifier filter circuit with adjustable two-stage gain is designed by using the principle of two-channel denoising. The signal before and after processing is analyzed, and it can be seen that the external noise and internal noise of the system are eliminated by such a design. Through the test platform, the data processing and performance test of the infrared sensor are carried out, and the rationality of the design is verified.
【作者单位】：仪器科学与动态测试教育部重点实验室;电子测试技术国防科技重点实验室;
【基金】：国家863重大项目(2006AA040101)
【分类号】：TN911.23;TP212

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