动态下红外热释电传感器的目标定位方法  

New target location method based on dynamic pyroelectric infrared sensor

作　　者：孙乔[1] 杨卫[1] 于海洋[1] 刘俊[1] 

机构地区：[1]中北大学电子测试技术重点实验室,山西太原030051

出　　处：《红外与激光工程》2012年第9期2288-2292,共5页Infrared and Laser Engineering

基　　金：国家自然科学基金(50675213)

摘　　要：为了提高热释电传感器的探测灵敏度,拓宽其传统使用范围,提出了一种动态下热释电传感器发现人体目标并测向测距的新型使用方法。该方法大大扩展了热释电传感器的探测范围,根据波形能准确判定目标的方向,利用经验值推断出人体的目标距离。该系统采用热释电红外传感器作为探测器,创新运用红外透镜代替传统用法中的菲涅耳透镜,在步进电机的匀速带动下,单片机记录测量区域的原始红外波形(在环境基本不变且没有目标进入的情况下,波形具有一定规律且基本保持不变);目标进入测量区域内时将引起原始规律变化,单片机利用帧间差分法求出变化的波形,判断目标有无及方向、距离等结果。与热释电传感器的传统使用方法相比,该方法具有反应迅速、探测灵敏、探测范围大、可测向测距等新特点,大大拓宽了热释电传感器的使用范围,进一步提升了其在安防和智能家居系统中的应用。In order to improve detection sensitivity of the pyroelectric sensor and broaden the scope of traditional use of the sensor,a new applied method based on dynamic pyroelectric infrared sensor was presented in this paper,which can find the body target and coordinates.This method greatly expanded the detection range of pyroelectric infrared sensor,which could accurately determine the direction of the target according to the waveform,deduce the distance from experience.A pyroelectric infrared sensor was used as a detector in this system,innovatively use of infrared lens to replace the traditional Fresnel lenses.MCU recorded the original infrared waveform of the measurement area（if the environment keeped changeless in a long time the waveform would have a certain basic rules）;once the body target walked into the measurement area,it would lead to changes of the original law,and the microcontroller would obtain direction,distance and other results according to the use of inter-frame difference method.With the traditional use of pyroelectric sensor,the method had some new feathures such as fast response,detection sensitivity,wide detection range,direction measure and distance measure.It significantly broadens the use scope of the pyroelectric sensor,and further strengthens its application in security and smart home system.

关 键 词：热释电红外传感器 动态 大范围 测向 定距 

分 类 号：TN219[电子电信—物理电子学]