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An optical comparator for testing the compliance of fine sieves with existing standards was designed and built. It is a portable, low-cost instrument, featuring a range of magnification from ×8 to ×270 and scanning capabilities over a 30-cm-diameter surface. The design principles are discussed and test results regarding the accuracy and speed of operation are presented.
Graduate research associate, Optical Sciences Center, University of Arizona, Tucson, Ariz.
Civil engineering technician, Arizona Department of Transportation, Phoenix, Ariz.
Research engineer, Arizona Solar Energy Research Commission, Phoenix, Ariz.
Stock #: JTE11512J