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1. 发明授权

US5719396A Systems and methods for determining compliance of moving vehicles with emission-concentration standards 失效
标题翻译：确定移动车辆符合排放浓度标准的系统和方法
公开(公告)号：US5719396A
公开(公告)日：1998-02-17
申请号：US674075
申请日：1996-07-01
申请人： Michael D. Jack , Troy P. Bahan , Jeffrey L. Hanson , David R. Nelson , Allen J. Paneral , Jay Peterson
发明人： Michael D. Jack , Troy P. Bahan , Jeffrey L. Hanson , David R. Nelson , Allen J. Paneral , Jay Peterson
IPC分类号： G01N21/35 , G01N21/00
CPC分类号： G01N21/3504
摘要： An emission-concentration monitoring system (20)includes first and second monitor stations (22,32) which are separated by a sensing space (40) along a path (28) of a moving vehicle (26). Each station has a source of electromagnetic radiation (64) which is directed through the vehicle's exhaust plume. Each station also has a set of detectors (66) which are positioned to receive the radiation and configured to measure transmittances at wavelengths which are absorbed by molecular species of exhaust plume (e.g., hydrocarbons, nitric oxide, carbon monoxide and carbon dioxide). These sensed transmittances are converted to emission concentrations by a data processor (50) and compared to a set of emission-concentration standards. The vehicle is determined to be in violation only if its emission concentrations at both the first and second monitor stations exceeds the standards. To insure visual identification of the vehicle, images of it are formed at both stations with video cameras (42, 44) and a license plate reader (46). It has been found that the monitoring system improves testing accuracy because the first and second stations essentially form a check against each other to remove errors due, for example, to vehicular temporal variabilities.
摘要翻译：发射浓度监测系统（20）包括沿着移动车辆（26）的路径（28）由感测空间（40）分开的第一和第二监测站（22,32）。每个站具有电磁辐射源（64），其被引导通过车辆的排气羽流。每个站还具有一组检测器（66），其被定位成接收辐射并且被配置成测量在被排气羽流（例如烃，一氧化氮，一氧化碳和二氧化碳）的分子物种吸收的波长处的透射率。这些感测的透射率由数据处理器（50）转换为发射浓度，并与一组发射浓度标准进行比较。如果第一和第二监测站的排放浓度超过标准，车辆才被确定为违法。为了确保车辆的视觉识别，在具有摄像机（42,44）和牌照读取器（46）的两个车站形成图像。已经发现，监控系统提高了测试精度，因为第一站和第二站基本上形成对对方的检查，以消除由于例如车辆时间变化引起的错误。

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