9 - Scaling and linearization

Abstract

This chapter provides an overview of scaling and linearization. Also discusses scaling of linear response curves; the simplest and the most common type of response curve is a straight line . Linearization is the term applied to the process of correcting the output of an ADC in order to compensate for non-linearities present in the response curve of a measuring system. Non-linearities can arise from a number of different components, but it is often the sensors themselves that are the primary sources. There are several linearization methods to choose from and what -ever method is selected, it must suit the peculiarities of the system's response curve. Polynomials can be used for linearizing smooth and slowly varying functions, but are less suitable for correcting irregular deviations or sharp `corners' in the response curve. They can be adapted to closely match a known functional form or they can b e used in cases where the form of the response function is indeterminate.