Title :
An anemometer with PWM excitation
Author :
Oliveira, Amauri ; Freire, Raimundo C S ; Deep, Gurdip S. ; Lobo, Pio C.
Author_Institution :
UFPB-CCT-DEE, Campina Grande, PB, Brazil
Abstract :
An experimental prototype of an anemometer with PWM excitation is described. The instrument employs a thermistor as a flow detection sensor heated by a PWM voltage. An electronic negative feedback circuit substitutes the thermal power absorbed by the fluid from the heated sensor, and maintains it at a constant temperature. The pulse width contains the information about the fluid velocity and using a timer counter, the velocity information can be available in the digital form, without the use of a conventional A/D converter. Test results are also presented
Keywords :
anemometers; closed loop systems; electric sensing devices; feedback; flow measurement; pulse width modulation; thermistors; velocity measurement; PWM excitation; PWM voltage; absorbed thermal power substitution; anemometer; electronic negative feedback circuit; flow detection sensor; fluid velocity; heated sensor; pulse width; thermistor; timer counter; Feedback circuits; Fluid flow measurement; Instruments; Negative feedback; Prototypes; Pulse width modulation; Temperature sensors; Thermal sensors; Thermistors; Voltage;
Conference_Titel :
Industrial Electronics, Control, and Instrumentation, 1995., Proceedings of the 1995 IEEE IECON 21st International Conference on
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-3026-9
DOI :
10.1109/IECON.1995.483847
