Hot Wire Anemometry

[Tommy]

Hello world,
does anybody know how to do a 'Hot Wire Anemometry'- Amplifier-Servo.
I have made a sensor out of a small filament-lamp but am not sure about the amp.

Somebody?

Thanx in advance,
// Tommy

 

[Harold Ryan]

Hot wire anemometers require constant current control. The best way is to
insert a resistor in series with the hot wire and keep the measured voltage
across the resistor constant. Therefore, this is a closed loop circuit.
Harold




"Tommy" <tommy.petersen@vok.lth.se> wrote in message
news:5a0823bc.0504130134.6446b85c@posting.google.com...

Hello world,
does anybody know how to do a 'Hot Wire Anemometry'- Amplifier-Servo.
I have made a sensor out of a small filament-lamp but am not sure about
the amp.

Somebody?

Thanx in advance,
// Tommy

 

[Coyoteboy]

i looked on discovercircuits.com, i think, and found a 'rugged'
transistor based setup - slower to react than wire but still good, and
PWM output - ive yet to build it cos i cant find the transistors easily.