A microprocessor-based automatic polynomial lineariser for constant-temperature anemometry systems

The paper describes a microprocessor-based lineariser module which automatically computes the coefficients, offset, and gain settings required for an integral wideband polynomial lineariser. An iterative technique is used whereby the aggregate residual-squared error between the normalised input data and the generated 4th-order polynomial converges to a minimum. Weighting factors are included to give a curve-fitting accuracy approximating to a constant percentage of reading.