基于热释电红外传感技术测距的时间差法研究

利用热释电信号幅值法进行目标测距会产生较大的误判,因为输出信号幅值受诸多因素(目标个体差异、穿着服饰、传感器安放位置)的影响。在不附加光学装置或菲尼尔透镜时热释电传感器通常仅能够短距离地感知动目标的存在与否,并不能辨别其出现和距离。使用加装红外透镜的方法将传感器的感知范围延伸至30 m。在对采集到的大量信号进行特征分析后发现模拟信号峰—峰值时间差与动目标距节点间的距离存在线性关系,利用这种关系实现了30 m可探测范围内较高精度的测距。该方法与信号幅值测距法相比,可明显地提高测距的可靠性和准确性。

Research on time difference method for distance measuring based on pyroelectric infrared sensing technology

Using pyroelectric signal amplitude method for target distance-measuring will have a greater error,because the output signal amplitude is affected by many factors(target individual differences,wearing apparel,sensor placement).Without additional optical device or a Fresnel lens,pyroelectric sensors usually can only percept the present of moving target in a short distance,and can not distinguish the distance.Sensing range of the sensor extends to 30m by using an infrared lens means.After characteristically analyzing on the acquired large quantities of signal,it is found that there is linear relation between the analog signal peak time difference and the moving target distance from the nodes,by taking advantage of this relationship high precision distance-measuring is realized in 30m possible detecting range.Compared with the signal amplitude distance-measuring method,this method can obviously improve the distance-measuring reliability and accuracy.