26 September 1997 Specialized optical systems for measurement of retroreflective materials
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Abstract
The unique characteristics of the different types of retroreflective materials and devices used in the transportation field, require specialized designs of optical systems to accurately measure their properties. Various instruments are available to measure the retroreflective characteristics both in the laboratory and in the field. Certain parameters, such as aperture angles and the tolerances on observation angle and entrance angles must be considered when designing such systems or large inaccuracies will occur. Specific differences in the properties of the retroreflectors require instruments that resolve those differences. Geometry of measurement is an important factor in the instrument design. Examples of the light distribution returned from these retroreflectors and the corresponding measurement instrumentation are shown.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Justin J. Rennilson, "Specialized optical systems for measurement of retroreflective materials", Proc. SPIE 3140, Photometric Engineering of Sources and Systems, (26 September 1997); doi: 10.1117/12.279233; https://doi.org/10.1117/12.279233
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