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Publication Number: FHWA-HRT-04-140
Date: December 2005

Enhanced Night Visibility Series, Volume IX: Phase II—Characterization of Experimental Objects

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LIST OF ACRONYMS AND ABBREVIATIONS


General Terms

ENV Enhanced Night Visibility
IR infrared
VES vision enhancement system
SUV sport utility vehicle
UV–A ultraviolet A (wavelength 315 to 400 nanometers)

Vision Enhancement Systems

HLB halogen (i.e., tungsten-halogen) low beam
hybrid UV–A + HLB hybrid UV–A/visible output together with halogen low beam
three UV–A + HLB three UV–A headlamps together with halogen low beam
five UV–A + HLB five UV–A headlamps together with halogen low beam
HLB–LP halogen low beam at a lower profile
HHB halogen high beam
HOH high output halogen
HID high intensity discharge
hybrid UV–A + HID hybrid UV–A/visible output together with high intensity discharge
three UV–A + HID three UV–A headlamps together with high intensity discharge
five UV–A + HID five UV–A headlamps together with high intensity discharge
IR–TIS infrared thermal imaging system

Objects

BC black-clothed cyclist
BPL black-clothed pedestrian, parallel configuration
BPP black-clothed pedestrian, perpendicular configuration
CB child’s bicycle
TT tire tread
WC white-clothed cyclist
WPL white-clothed pedestrian, parallel configuration
WPP white-clothed pedestrian, perpendicular configuration

Statistical Terms

ANOVA analysis of variance
DF degrees of freedom
F value F-ratio
MS mean square
N number of measurements
P value statistical significance
SS sums of squares

Measurements

delta symbolL luminance difference
delta symbolLth threshold luminance difference
C contrast
cd/m² candela per square meter
ft feet
kPa kilopascals
L luminance
lx lux
m meters
nm nanometers
psi pounds per square inch
s seconds
VL visibility level
µm micrometers

Calculated Variables

AF age factor
FCP negative contrast factor
t observation time
TF time factor
rho symbol reflectivity
E illuminance
beta symbol(theta symbol) angular scattering coefficient
theta symbol angle of observation
dx length of lamina
beta symbol total scattering per unit length

 

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