PHOTOMETER FOR MEASUREMENT OF REFLEX-REFLECTIVE SIGN MATERIALS
A RELIABLE AND CONVENIENT PHOTOMETER TO REPLACE THE CLASSIC BUT CUMBERSOME DARKROOM TUNNEL METHOD OF TESTING REFLEX-REFLECTIVE SIGN MATERIALS HAS LONG BEEN DESIRED. THE INSPECTION OF MATERIALS AND ENFORCEMENT OF SPECIFICATIONS REQUIRES A DEVICE WHICH CAN PROVIDE FAST, ACCURATE AND REPEATABLE RESULTS IN AGREEMENT WITH SEVERAL ESTABLISHED CRITERIA. A PROPOSED PHOTOMETER WAS EVOLVED AFTER CAREFUL REVIEW OF THE GEOMETRICS OF THE TYPICAL HIGHWAY ENVIRONMENT ENCOUNTERED BY THE MOTORIST. A COMPARISON OF PHOTOMETRIC READINGS TAKEN WITH THE PROPOSED PROTOTYE METER AND THE CLASSIC DARKROOM TUNNEL METHOD AT 0.2 AND 0.5 DEG DIVERGENCE ANGLE IS SHOWN. COLOR SAMPLES REPRESENTING THE COLOR SPECTRUM EMPLOYED ON HIGHWAY SIGNS WERE TESTED. FURTHER, A COMPARISON WITH A RIGOROUS VISUAL NIGHTTIME SERIES OF OBSERVATIONS WAS MADE. THE RESULTS OF BOTH COMPARISONS WERE ANALYZED USING STANDARD STATISTICAL METHODS. THE RESULTS OF THIS ANALYSIS INDICATE THAT THE PROPOSED PHOTOMETER CORRELATES AT A HIGH CONFIDENCE LEVEL WITH BOTH THE CLASSIC DARKROOM METHOD AND VISUAL OBSERVATIONS. THE TEST DATA ARE REVIEWED AND THE OPTICAL AND ELECTRICAL CHARACTERISTICS OF THIS BENCH PHOTOMETER ARE DESCRIBED. MODIFICATION TO A PORTABLE PHOTOMETER IS POSSIBLE TO PERMIT DAYTIME FIELD INSPECTION OF THE REFLECTIVE EFFICIENCY OF EXISTING TRAFFIC SIGNS. /AUTHOR/
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Supplemental Notes:
- Paper sponsored by Committee on Coatings, Signing and Marking Materials and presented at the 47th Annual Meeting. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
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Authors:
- Rector, H C
- Youngblood, W P
- Publication Date: 1968
Media Info
- Media Type: Digital/other
- Features: Appendices; Figures; References; Tables;
- Pagination: pp 15-21
- Monograph Title: Paints, metals, joints and polyester overlays
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Serial:
- Highway Research Record
- Issue Number: 242
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Alternatives analysis; Color; Daylight; Field tests; Night; Nondestructive tests; Optical properties; Photometers; Reflective signs; Reflectorized paint; Statistical analysis; Traffic signs
- Subject Areas: Data and Information Technology; Geotechnology; Highways; Materials;
Filing Info
- Accession Number: 00216743
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Dec 16 1994 12:00AM