Laser and one-dimensional PDA on the elevator overspeed measuring

摘要：

This paper provide a new method of elevator overspeed measurement. Helium-Neon laser is mounted vertically on the surface of the elevator car. One-dimensional photodiode array(PDA) is installed at the top of the shaft. The laser beam passes through the beam shaping lens for good homogeneity and proper divergence angle. According to the total height of shaft and the divergence angle =0.4mrad θ , the spot radii in different heights of elevator car are measured. On the basis of small divergence angle a model proposed that the beam radii change linearly with the heights of elevator car. The interval in adjacent detection units is determined in this model. The laser spot is spreading from center to edge when the elevator car is moving down. The time interval of signals in adjacent detection units are measured by timing circuit. When the elevator is running in maximal speed, the time interval of signals is defined as time threshold. Time intervals of signals are compared with time threshold. Time intervals of signals are greater than time threshold that elevator running normally, time intervals of signals are less than 0 t that elevator overspeed.

关键词： laser beam one-dimensional PDA beam shaping elevator overspeed

作者: Guolie Jin Peng Xu Yingjie Zhao Lingmin Wan Botao Hao Xiaoguang Li Yusi Zhao

作者单位: National Key Lab on High-Power Semiconductor LasersChangchun University of Science and TechnologyChangchun, China

会议类型: 国际会议

会议名称: 2012 International Conference on Optoelectronics and Microelectronics(2012光电子与微电子国际学术会议 2012 ICOM)

会议地点: 长春

会议语种:英文

页码: 91-94

在线出版日期: 2012-08-23（万方平台首次上网日期，不代表论文的发表时间）