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为了准确及时地掌握车辆的流量、流向,为公路设计和交通管理提供可靠数据,我们在试制78型车辆密度自动计数仪(用光电原理)的基础上,于一九七九年上半年又初步研制成79型超声波车辆计数仪。经过现场初步检测试验,准确率达到百分之九十五左右,基本达到计数要求。现作阶段报告如下: 一、结构及工作原理概述 车辆计数仪的关键是“感知器”。它的作用是当汽车通过公路的检测点时,能感知到是汽车,也就是将车辆通过时的非电量信号如何转换成电量信号。
In order to accurately and timely grasp the flow of vehicles, the flow of road design and traffic management to provide reliable data, we test prototype 78 automatic vehicle density meter (based on the principle of optoelectronics), in the first half of 1979 and a preliminary Developed 79 type ultrasonic vehicle counter. After the initial test on site, the accuracy rate reached about 95%, basically meeting the counting requirements. The current stage report is as follows: First, the structure and working principle Overview Vehicle counter is the key to “perception.” Its role is to perceive a car as it crosses a test point on the road, ie converting a non-power signal into a power signal when passing the vehicle.