Abstract
The two-parameter frequency optimisation theory which was originally developed for the constant-temperature hot-wire anemometer is extended to hot-film anemometers. It is found that the constant-temperature hot-film anemometer behaves as a control system of order 5/2 which allows for a two-parameter optimisation of its dynamic response. The cut-off frequency of the hot-film anemometer can be estimated by means of a sine-wave test. A combination of sine-wave and square-wave testing seems to be the best strategy for optimising the system.