Signal Perturbation Technique for Achievement of Linear Position Transfer Characteristic

Improved position detection using a one-dimensional photosensor array has been shown [1], [2] to be possible by applying a high-frequency triangular perturbation signal to a normalized target image. This paper develops an adequate model for describing the receptor system with respect to the perturbation amplitude, the receptor element threshold, and the deadband between elements. From the model, it is shown how the parameters can be adjusted to achieve a linear position transfer characteristic when deadband exists between elements.