Real-Time Measurements of Diesel Vehicle Exhaust Particulate Using Photoacoustic Spectroscopy and Total Light Extinction

1981 ◽  
Author(s):  
Steven M. Japar ◽  
Ann Cuneo Szkarlat
Keyword(s):  
Real Time ◽  
Photoacoustic Spectroscopy ◽  
Light Extinction ◽  
Vehicle Exhaust ◽  
Total Light ◽  
Diesel Vehicle ◽  
Exhaust Particulate

The On-Board Measurement of Diesel Vehicle Smoke Intensity System

2012 ◽  
Vol 220-223 ◽  
pp. 684-688
Author(s):  
Hong Yan Chen ◽  
Yi Jin Song
Keyword(s):  
Fixed Point ◽  
Real Time ◽  
Exhaust Emission ◽  
Vehicle Exhaust ◽  
Diesel Vehicle

To real-time monitor vehicle exhaust emission under daily running, this paper proposed a on-board measurement of diesel vehicle smoke intensity system based on GSM/GPRS and GPS, and concentrated on the design of hardware and software of the vehicle mounted terminal. This paper broke the traditional fixed-point way to sample exhaust data and could acquire data of different section, different vehicle types and different time.

Roughness measurements of nonlinear optical polymer films by scanning tunneling microscopy

1989 ◽  
Vol 47 ◽  
pp. 22-23
Author(s):  
I. H. Musselman ◽  
R.-T. Chen ◽  
P. E. Russell
Keyword(s):  
Surface Roughness ◽  
Scanning Tunneling Microscopy ◽  
Nonlinear Optical ◽  
Polymer Surface ◽  
Light Extinction ◽  
Scanning Tunneling ◽  
Silicon Substrates ◽  
Tunneling Microscopy ◽  
Optical Polymer ◽  
Total Light

Scanning tunneling microscopy (STM) has been used to characterize the surface roughness of nonlinear optical (NLO) polymers. A review of STM of polymer surfaces is included in this volume. The NLO polymers are instrumental in the development of electrooptical waveguide devices, the most fundamental of which is the modulator. The most common modulator design is the Mach Zehnder interferometer, in which the input light is split into two legs and then recombined into a common output within the two dimensional waveguide. A π phase retardation, resulting in total light extinction at the output of the interferometer, can be achieved by changing the refractive index of one leg with respect to the other using the electrooptic effect. For best device performance, it is essential that the NLO polymer exhibit minimal surface roughness in order to reduce light scattering. Scanning tunneling microscopy, with its high lateral and vertical resolution, is capable of quantifying the NLO polymer surface roughness induced by processing. Results are presented below in which STM was used to measure the surface roughness of films produced by spin-coating NLO-active polymers onto silicon substrates.

Composition of Light-Duty Motor Vehicle Exhaust Particulate Matter in the Denver, Colorado Area

1999 ◽  
Vol 33 (14) ◽  
pp. 2328-2339 ◽  
Author(s):  
Steven H. Cadle ◽  
Patricia A. Mulawa ◽  
Eric C. Hunsanger ◽  
Ken Nelson ◽  
Ronald A. Ragazzi ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Motor Vehicle ◽  
Vehicle Exhaust ◽  
Light Duty ◽  
Exhaust Particulate

Studies of grain production in Sorghum bicolor (L. Moench). VI.* Profiles of photosynthesis, illuminance and foliage arrangement. 4. Profiles of Photosynthesis, Illuminance and Foliage Arrangement

1976 ◽  
Vol 27 (1) ◽  
pp. 35 ◽  
Author(s):  
KS Fischer ◽  
GL Wilson
Keyword(s):  
Leaf Surface ◽  
Canopy Structure ◽  
Light Extinction ◽  
Grain Production ◽  
Area Index ◽  
14Co2 Uptake ◽  
Total Light ◽  
Intercepted Radiation ◽  
Density Population ◽  
Sorghum Bicolor L

Grain sorghum was grown at two population densities in the field, and photosynthetic rates compared at noon. Profiles of photosynthesis were established by combining measurements of 12CO2 exchange and 14CO2 uptake. Canopy structure and light penetration were measured. Factors responsible for the superiority of the higher density population were evaluated. Photosynthesis–radiation responses of leaves were similar between the populations and there was little difference in total light interception. The high density population had leaves which were more vertically displayed, more uniformly dispersed, smaller in both length and width, and distributed over a greater height of canopy. Light was therefore more uniformly distributed down the profile, and coefficients of light extinction were lower. Associated with this was a higher leaf area index. The overall consequence was the distribution of intercepted radiation over a larger leaf surface, at a lower illuminance and therefore a higher efficiency of photosynthetic conversion, resulting in greater total photosynthesis. ___________________ ** Part V, Aust. J. Agric. Res., 26: 31 (1975).

Development of a real time respirable coal dust and silica dust monitoring instrument based on photoacoustic spectroscopy

2021 ◽  
pp. 233-241
Author(s):  
P. Nascimento ◽  
S.J. Taylor ◽  
W.P. Arnott ◽  
K.C. Kocsis ◽  
X.L. Wang ◽  
...  
Keyword(s):  
Real Time ◽  
Photoacoustic Spectroscopy ◽  
Coal Dust ◽  
Monitoring Instrument ◽  
Silica Dust

The Design and Implementation of the Terminal in a Vehicle Exhaust Real Time Detecting System

2012 ◽  
Vol 605-607 ◽  
pp. 1012-1015
Author(s):  
Feng Lin ◽  
Jin Yan ◽  
Zhen Zhou Ye ◽  
Yi Jin Song ◽  
Hong Yan Chen
Keyword(s):  
Real Time ◽  
Urban Areas ◽  
Measuring System ◽  
Environment Protection ◽  
Vehicle Exhaust ◽  
Vehicle Location ◽  
Transient Data ◽  
Online Detecting ◽  
Microcontroller Unit ◽  
Detection Unit

This research proposed a real time exhaust measuring system and realized automatic acquisition of exhaust data. In this research, VMT (Vehicle Mounted Terminal) which is integrated with GPRS module, GPS module,exhaust detection unit and microcontroller unit, collected the concentration of CO2, CO and HC and the vehicle location which were then sent to MC (Monitoring Center) via GSM/GPRS net. In this way, both exhaust transient data under daily running and vehicle location are available to environment protection department, which provided a new method to rid high emitting vehicles in urban areas. The system has extensive practical value in vehicle exhaust online detecting, remote vehicles management and environment monitoring.

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