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    • 28. 发明授权
    • Remote sensor device for monitoring motor vehicle exhaust systems
    • 用于监控机动车排气系统的远程传感器装置
    • US5371367A
    • 1994-12-06
    • US45211
    • 1993-04-13
    • John DiDomenicoJames H. JohnsonKenneth W. MichaelsDonald H. StedmanDennis L. Smith
    • John DiDomenicoJames H. JohnsonKenneth W. MichaelsDonald H. StedmanDennis L. Smith
    • G01N21/35G01N21/01
    • G01N21/3504G01N2021/1793
    • Apparatus for detecting and measuring relative concentrations of pollutants such as HC, CO and CO.sub.2 in the exhaust emissions from passing vehicles includes an infrared (IR) beam source for directing an IR beam through a vehicle's exhaust plume and a detector disposed on one side of a roadway and a lateral transfer mirror (LTM) disposed on the other side of the roadway for lateral reflecting of the IR beam back through the vehicle's exhaust plume and onto the detector. The LTM allows for close spacing and precise alignment between the emitted and reflected beam paths and permits the IR beam source and detector to be disposed in a single module. Compensation for variation in a range of vehicle operating conditions is provided by adjustable, computer-controlled potentiometers, while audio and/or visible light feedback of the detected IR signal allows a single operator to precisely align the optical components of the apparatus. The IR detector module includes a rotating mirror arrangement for directing the reflected IR beam in a pulsed manner onto a plurality of spaced detector elements, each adapted for detecting a specific pollutant, with the detector elements calibrated with each detected IR pulse to reduce errors arising from circuit drift.
    • 用于检测和测量来自过去车辆的废气排放物中的诸如HC,CO和CO 2的污染物的相对浓度的装置包括用于将红外光束引导通过车辆的排气羽流的红外(IR)光束源和设置在车辆的一侧的检测器 道路和设置在道路另一侧的横向转移反射镜(LTM),用于横向反射IR光束通过车辆的排气羽流反射到检测器上。 LTM允许在发射和反射光束路径之间进行紧密间隔和精确对准,并允许IR光束源和检测器设置在单个模块中。 通过可调节的计算机控制的电位器来提供车辆操作条件范围内的变化的补偿,而检测到的IR信号的音频和/或可见光反馈允许单个操作者精确对准装置的光学部件。 IR检测器模块包括旋转镜装置,用于将反射的IR光束以脉冲方式引导到多个间隔开的检测器元件上,每个检测器元件适于检测特定污染物,检测器元件用每个检测到的IR脉冲进行校准,以减少由 电路漂移。