AN INSTRUMENT FOR PRECISION PHOTOMETRY OF REFLEX REFLECTIVE MATERIALS
A PHOTOMETER HAS BEEN DEVELOPED WHICH IS THE FIRST PORTABLE TESTING INSTRUMENT WHOSE MEASUREMENTS CORRELATE COMPLETELY WITH FULL-SCALE LABORATORY DATA AND ACTUAL HIGHWAY CONDITIONS. IT PROVIDES ACCURATE MEASUREMENT OF PERFORMANCES AT DISCRETE VIEWING ANGLES THROUGHOUT THE RANGE OF MODERN REFLECTOR USAGE. THE BASIC COMPONENTS OF THE PHOTOMETER ARE (1) A LIGHT SOURCE TO ILLUMINATE THE REFLECTOR, (2) A PHOTOELECTRIC RECEIVER TO MEASURE THE INTENSITY OF THE REFLECTED BEAM AT DISCRETE OBSERVATION ANGLES AND CONVERTS THESE MEASUREMENTS TO SPECIFIC INTENSITY VALUES WHICH ARE INDICATED ON A GALVANOMETER, AND (3) A GONIOMETER ON WHICH THE TEST REFLECTOR IS MOUNTED.
- Record URL:
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Supplemental Notes:
- No 298, pp 74-76. 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:
- Nagel, R I
- Troccoli, A M
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Conference:
- 40th Annual Meeting of the Highway Research Board
- Location: Washington DC, United States
- Date: 1961-1-9 to 1961-1-13
- Publication Date: 1961
Media Info
- Media Type: Digital/other
- Pagination: 3p
- Monograph Title: Night visibility 1961
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Serial:
- Highway Research Board Bulletin
- Issue Number: 298
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Photocells; Photometers; Portable equipment; Reflectorized materials; Retroreflection
- Old TRIS Terms: Goniometers; Retrodirective reflection
- Subject Areas: Highways; Safety and Human Factors;
Filing Info
- Accession Number: 00220225
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Aug 12 1994 12:00AM