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10 September 2009 Measurement accuracy of fringe projection depending on surface normal direction
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An accuracy analysis of fringe projection systems is performed taking into account the geometric properties of the sensor and the surface shape of the measuring objects. Especially the deviations of the normal vector directions between the optical axis of projection and observation contribute to differences in the achievable measuring accuracy. An accuracy model was developed which describes the relation between the (fix) geometry of the sensor components and the (variable) conditions of the measurement characterized by a set of parameters on the one side and the measuring accuracy on the other side.
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Peter Kühmstedt, Christian Bräuer-Burchardt, and Gunther Notni "Measurement accuracy of fringe projection depending on surface normal direction", Proc. SPIE 7432, Optical Inspection and Metrology for Non-Optics Industries, 743203 (10 September 2009);

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