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Optical coating inspection of pharmaceutical tablets by diffractive element

Due to a printing error, the captions to figures 1 and 3, and a portion of text below figure 3, were omitted. The missing sections are reproduced in full below. Figure 1. Schematic diagram of the set-up. Figure 3. (a) The speckle pattern obtained from uncoated tablet; (b) the speckle pattern and interference fringes from the coated tablet. Optical inspection by the CGH sensor and by a speckle pattern technique complement each other and both measurements can be performed simultaneously. However, the advantage when using the CGH sensor is that we can get information about the surface curvature and make correlation analysis about the surface porosity as described in [10]. In general, the recorded optical signals depend to a great extent on the optical constants of the coatings and the substrates, and in addition to the surface porosity under the coating. In the event that the surface statistics of the porous surface obey a Gaussian probability function, then the mathematical model for the specular and diffuse reflectance can be given as formulated by Beckmann and Spizzichino [14]. The essence of the surface statistics will be investigated in the near future.