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Publication Number: FHWA-HRT-04-148
Date: December 2005

Enhanced Night Visibility Series, Volume XVII: Phases II and III—Characterization of Experimental Vision Enhancement Systems

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LIST OF ACRONYMS AND ABBREVIATIONS


General Terms

ENV Enhanced Night Visibility
FMVSS Federal Motor Vehicle Safety Standards
OCH optical center height
OEM original equipment manufacturer
SAE Society of Automotive Engineers
SD standard deviation
SPD spectral power distribution
UV–A ultraviolet A (wavelength 315 to 400 nanometers)
VES vision enhancement system
VOA visually optically aligned
VOR visually optically aligned right
VOL visually optically aligned left

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
NIR near infrared vision system
FIR far infrared vision system

Measurements

cd candela
cm centimeter
ft feet
h hour
km/h kilometers per hour
lm lumens
lx lux
m meters
mi/h miles per hour
nm nanometers
sr steradian
W Watts

Visible Light and Radiant Formulae

theta symbol angle of observation
lambda symbol wavelength
phi symbol flux
omega symbol solid angle
A area of the surface
E illuminance
I intensity
k maximum spectral luminous efficacy in lumens per Watt
L luminance
P(lambda symbol) spectral power output from source
V(lambda symbol) human visual spectral response

 

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