In metrology, form errors can occur during measurements when the geometry or shape of the object being measured does not precisely match the assumptions of the measurement method. Form errors can lead to inaccurate or erroneous measurements as they can distort the measurements.
An example of a form error in metrology is an uneven or irregular object being measured, which can affect the measurements. An uneven surface, for instance, can lead to an uneven distribution of the measurement signal, resulting in an inaccurate measurement.
To minimize form errors in metrology, measurement systems and methods must be developed to account for and correct for the shape of the object being measured. This can be achieved, for example, by using specialized sensors or by adapting measurement methods to the shape of the object being measured.