Readability of self-illuminated signs obscured by black fuel-fire smoke.

Rasmussen, P.G.; Chesterfield, S.P.; Lowrey, D.L.; Civil Aeromedical Institute

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Readability of self-illuminated signs obscured by black fuel-fire smoke.

1980-07-01
By Rasmussen, P.G. ; Chesterfield, S.P. ; Lowrey, D.L.

[PDF-493.97 KB]

English

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Creators:

Rasmussen, P.G. ; Chesterfield, S.P. ; Lowrey, D.L.

Rasmussen, P.G. ; Chesterfield, S.P. ; Lowrey, D.L. Less -
Corporate Creators:

Civil Aeromedical Institute
Corporate Contributors:

United States. Office of Aviation Medicine
Subject/TRT Terms:

[+]

Aircraft Accidents Air Transportation Crashes Distance Perception Emergency Exits Experiments Human Subject Testing Lighting Luminance Luminescence Signals Signals And Signaling Smoke Vision--Testing Vision Tests Visual Acuity Visual Perception
Publication/ Report Number:

FAA-AM-80-13 ; DOT/FAA/AM-80/13

FAA-AM-80-13 ; DOT/FAA/AM-80/13 Less -
Resource Type:

Tech Report
Geographical Coverage:

United States
Corporate Publisher:

Civil Aerospace Medical Institute
Abstract:

This study, using black fuel-fire generated smoke, is a partial replication of an earlier study using an inert white smoke as the obscuring agent in the study of the readability of smoke-obscured, self-illuminated emergency exit signs.

The results indicate that, within the range of sign sizes and background luminance levels studied, and under otherwise favorable viewing conditions, most of the signs were read through black smoke with optical densities ranging between 3.0 and 4.0. At two standard deviations below the means, most of the size and luminance level combinations were identified at optical densities ranging from approximately 2.5 to 3.0.

A comparison of the results with those obtained in the earlier study using white smoke, shows both colors of smoke to be approximately equal in their ability to shroud the illuminated signs. Black smoke, however, appears somewhat more effective in obscuring small details at or near the normal visual acuity threshold.
Format:

PDF
Collection(s):

FAA Civil Aerospace Medical Institute US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:b36b8e84a29ff56611cfd690f50934791e371ebe3a731ffb6af262a2c94791d5
Download URL:

https://rosap.ntl.bts.gov/view/dot/21243/dot_21243_DS1.pdf
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Readability of self-illuminated signs obscured by black fuel-fire smoke.

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