基于多普勒效应的多角度安防装置设计

Design of Multi-angle Security Device Based on Doppler Effect

设计一种基于多普勒效应原理的安防装置,利用固定频率的超声波被运动物体反射的回波频率相对于原始频率所产生的偏差进行运动检测。通过对发射、接收、报警执行等部位电子电路的设计,提高监控装置的响应时间、灵敏度,减少误报警的概率;采用发射和接收装置旋转工作方式,达到全方位、多角度的监控目的,适用于对展览馆等较大空间内的展览台玻璃罩内的贵重物品等进行安全防护。

A kind of security device based on Doppler effect was designed,which used the deviation of echo frequency of fixed frequency ultrasonic reflected by moving object relative to the original frequency for motion detection.Through the design of electronic circuits for transmitting,receiving and alarm execution,the response time and sensitivity of the monitoring device were improved,and the probability of false alarm was reduced.The rotating working mode of transmitting and receiving device was adopted to achieve the purpose of omni-directional and multi angle monitoring,which was suitable for the safety protection of valuables in the glass cover of exhibition platform in large space such as exhibition hall.