THERMOANEMOMETER WITH DC FEEDBACK,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
Pagination or Media Count:
A brief description is given of a thermoanemometer which measures the mean velocity of air flow up to 120 msec and velocity pulsation intensity up to 10,000 c,. Compensation of thermal inertia of the filament is realized with the aid of a feedback amplifier, which makes a corresponding current regulation of filament heating current and automatically maintains the resistance of this filament. The instrument has a special amplifier, rectifying the non-linear dependence of the signal upon the rate of flow coming from the filament. Measurement of mean square root values of velocity pulsation is made with the aid of a pulsation amplifier, vacuum thermocouple, and thermo EMF amplifier.