Abstract
A new technique to (i) maintain the resistance of a fine wire probe at an elevated and a `constant' value, and (ii) utilize the duration of the heating current as a measure of the effective cooling velocity is reported here for the first time. The pulse width modulated (PWM) - constant temperature anemometer (CTA) is inherently a digital device given the discrete times at which the output (as a parallel 16-bit number) is presented to the recording device. The advantages of this new device over a conventional CTA are noted. The need for additional performance measures is also clarified.
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