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测定观察角是学校建筑设备卫生监测的常用指标。笔者设计一种转盘法查数十分简便,特介绍给读者参考。以第一排就座学生处为B点,最小观察角处为O点,B、O两点形成的直角处为A点。根据三角函数的正切定理,其最小观察角的大小,不仅与第一排课桌前缘距黑板的距离有关(即AB值,以下简称AB),而且还与黑板的一侧边缘至另一侧边墙距离有关(即AO值),以下简称AO。由于历年来,各地建造的教室宽度不统一,因此,笼统地以AB值不得大于二米来评价最小观察角是否符合卫生要求,其准确性值得考虑。
Determination of observation angle is the school building equipment health monitoring commonly used indicators. I design a turntable method is very simple, especially introduced to the reader for reference. The first row of students sitting at point B, the minimum observation point at the O point, B, O two points at the right angle at the A point. According to the tangent theorem of trigonometric functions, the minimum observation angle is not only related to the distance between the first row of desk front and the blackboard (ie, AB value), but also to the side of the blackboard to the other side The wall distance (ie AO value), hereinafter referred to as AO. Due to the uneven width of the classrooms built over the years, it is generally worth noting that the AB value should not be greater than two meters to evaluate whether the minimum observation angle meets the hygiene requirements.