公开(公告)号：US5591975A

公开(公告)日：1997-01-07

申请号：US318566

申请日：1994-10-05

申请人： Michael D. Jack ,  Robert D. Stephens ,  Christopher B. Tacelli ,  David R. Nelson ,  Geoffrey A. Walter ,  Jose A. Santana ,  Lane H. Rubin

发明人： Michael D. Jack ,  Robert D. Stephens ,  Christopher B. Tacelli ,  David R. Nelson ,  Geoffrey A. Walter ,  Jose A. Santana ,  Lane H. Rubin

IPC分类号： G01N21/35 ,  G01N33/00 ,  G01N21/25

CPC分类号： G01N33/0037 ,  G01N21/3504 ,  G01N2021/1793

摘要： A light source radiates an infrared beam that passes through a chopper, a calibration cell and the exhaust plume of a motor vehicle passing in front of the source. A photosensor assembly includes a plurality of photodetectors which are spaced closely adjacent to each other and simultaneously sense the beam after it propagates through the plume. An optical beam homogenizer or integrator disposed between the plume and the photosensor unit causes the light incident on the photodetectors to have uniform intensity. The photodetectors are sensitive to different wavelengths corresponding to spectral absorption peaks of constituents of the composition of the plume, including carbon monoxide (CO), carbon dioxide (CO.sub.2), hydrocarbon (HC), water vapor (H.sub.2 O) and nitric oxide (NO). A computer computes the composition of the plume as the percentages of the constituents based on the sensed transmittances of the respective wavelengths through the plume. A video camera produces a video image of the vehicle license plate, which is displayed on a video monitor and recorded on a video recorder together with the plume composition data.

摘要翻译： 光源辐射红外光束，该红外光束穿过切割器，校准单元以及通过光源前方的机动车辆的排气羽流。 光传感器组件包括多个光电检测器，它们彼此紧邻地间隔开，并且在光束传播通过羽流之后同时感测光束。 设置在羽流和光电传感器单元之间的光束均化器或积分器使入射到光电检测器上的光具有均匀的强度。 对于包括一氧化碳（CO），二氧化碳（CO 2），烃（HC），水蒸气（H 2 O）和一氧化氮（NO））的羽流组成的成分的光谱吸收峰，光电探测器对不同波长敏感， 。 计算机根据通过羽流的相应波长的感测透射率来计算羽流的组成作为组分的百分比。 视频摄像机产生车辆牌照的视频图像，其被显示在视频监视器上并与羽流组合数据一起记录在录像机上。

公开(公告)号：US5418366A

公开(公告)日：1995-05-23

申请号：US239151

申请日：1994-05-05

申请人： Lane H. Rubin ,  Michael D. Jack

发明人： Lane H. Rubin ,  Michael D. Jack

IPC分类号： G01N9/24 ,  G01N33/00 ,  G01N21/17 ,  G01N21/25 ,  G01N21/03

CPC分类号： G01N33/0037 ,  G01N21/3504

摘要： A system (10) for detecting nitric oxide (NO) within an exhaust plume (14) includes a source (18) for generating an optical beam (20) and for directing (22, 24) the optical beam through the exhaust plume, the optical beam having wavelengths within a predetermined band of wavelengths within the infrared (IR) radiation spectrum. The system includes a sensor (32)/filter (30) assembly having a first channel for determining a measured NO transmission value for a first predetermined band of wavelengths; a second channel for determining a measured water transmission value for a second predetermined band of wavelengths; a third channel for determining a measured reference transmission value for a third predetermined band of wavelengths selected so as not to be significantly absorbed by the exhaust plume; and a fourth channel for determining a measured combustion by-product transmission value for a fourth predetermined band of wavelengths. A data processor (38) is responsive to the outputs of the channels for determining an effective NO transmission value from the measured NO transmission value that is scaled by (a) the measured water transmission value, (b) a predetermined factor that compensates for absorption by water within the first predetermined band of wavelengths, and (c) the reference transmission value. The data processor is further operable for converting the effective NO transmission value to a relative NO concentration value using a predetermined calibration factor and for converting the relative NO concentration value to an actual NO concentration value utilizing the measured combustion by-product transmission value.

摘要翻译： 用于检测排气羽流（14）内的一氧化氮（NO）的系统（10）包括用于产生光束（20）并用于引导（22,24）光束通过排气羽流的源（18） 光束具有在红外（IR）辐射光谱内的预定波长范围内的波长。 该系统包括具有第一通道的传感器（32）/滤波器（30）组件，用于确定第一预定波长带的测量的NO传输值; 用于确定第二预定波段波长的测量水透射值的第二通道; 第三通道，用于确定被选择为不被排气羽流显着吸收的第三预定波长波段的测量参考透射值; 以及用于确定第四预定波段波长的测量的燃烧副产物传输值的第四通道。 数据处理器（38）响应于通道的输出，用于通过（a）测量的水传输值来缩放的测量的NO传输值来确定有效的NO传输值，（b）补偿吸收的预定因子 在第一预定波段内的水，以及（c）参考透射值。 数据处理器还可操作用于使用预定校准因子将有效NO透射值转换为相对NO浓度值，并且利用所测量的燃烧副产物透射值将相对NO浓度值转换为实际NO浓度值。