Principles Used in Measurement
Some of the most important applications of lasers involve their use for measurement of a wide variety of different quantities: distance, product dimension, angular rotation rate, and so forth. Optical methods of measurement have been employed for many years. Previously, they had been limited by the available light sources, which traditionally lacked sufficient coherence or sufficient brightness to perform all desired measurement tasks well. The development of the laser has removed these limitations. The availability of lasers has led to improvement of conventional optical measurement techniques and the introduction of many effective new techniques. Laser-based measurements have been particularly useful ...
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