Abstract: Point to the unusual problems in the detection process, for example of the channel failure and not continuous transverse shape signal, the shape detection error and the abnormal signal compensation model are established based on the principle of contactless shape detection, piezomagnetic sensor and its electromagnetic characteristics. Comprehensive theoretical models and test datum, the effects of technological factors on the original shape signal, such as the zero remaining voltage signal, the strip edge error, the detection roll deflection and its installation accuracy and so on, are analyzed to solve instability problem of the original shape signal. For example of 1050 cold rolling mill, according to the mill model configuration and the rolling parameters, the start and the end channel numbers, the edge error compensation amount, the deflection change and the logical installation accuracies of the shape detection roll could be online calculated by the model to meet requirements of the online shape control, and appropriate emergency measures are advanced to prevent serious mistakenly regulation accident of mill caused by abnormal signal, and to achieve stable carefree rolling and improve the shape detection precision and the shape control precision.

Key words: shape detection;zero drift;abnormal signal;error compensation;cold rolling strip