Optical instrumentation for quality assurance

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Abstract
The advantages of using optical instrumentation for quality assurance and the practical problems which need to be overcome in the process of applying this technology in industry are discussed and reviewed. After a brief description of the basic methods used in the design of this type of instrument, typical systems using lasers, white light and infrared radiation for the measurement of imperfections on wide strip material, microscopic flaws on small components and stress patterns on dynamically loaded structures are described. These applications illustrate the way in which instrument technology can be advanced by selecting designs which benefit from the advantages of optical systems whilst avoiding the difficulties which often preclude their use in an industrial environment.

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