中图分类号： TN702
文献标识码： A
DOI：10.16157/j.issn.0258-7998.200245
中文引用格式： 庞晓东. 同频抗互扰低成本安检机双光障设计[J].电子技术应用，2021，47(1)：57-60，68.
英文引用格式： Pang Xiaodong. Design of anti co-channel interference, low cost twin light barriers for security inspection equipment[J]. Application of Electronic Technique，2021，47(1)：57-60，68.

Design of anti co-channel interference, low cost twin light barriers for security inspection equipment

Abstract： Light barriers are the key parts of X-ray security inspection equipment, which are used in large amount and cost a lot. In order to reduce the cost, increase the performance and reduce the dependence on the purchased products, a light barrier design scheme is proposed in this paper. According to the specific application requirements of the security inspection machine, a single clock source and a fixed phase difference transmitting and receiving mode are adopted, and low-cost components are selected to realize the reliable anti-interference of multiple light barriers in the security inspection machine; the automatic gain control function and self-test function are designed, and the system wiring is simplified through the optimized interconnection interface, so the performance of the whole machine is further improved. After batch application, the price is only one tenth of the original system, which effectively reduces the production cost of the security inspection machine.

Key words : light barrier；security inspection equipment；low-cost; photoelectric switch；X-ray inspection