Quote:
Originally Posted by Michael Hill
Well, the application would be to judge tip clearance on a turbine in an aircraft. I'm not exactly sure of the capabilities of a hall-effect sensor, especially at these high frequencies. Blades will pass at around 336 kHz. A voltage relation between distance is what I will need. I'm not counting them, we already know how many will pass by since we are measuring RPM with a quadrature encoder on the shaft.
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I have used a special type of hall effect sensor for measureing deflection of the flywheel on an engine. These were good for measuring deflection during idle. I beleive the linear voltage vs. distance range was around 1mm (.4 to 1.4 mm = 0.5 to 4.5V). Less than 0.4mm the linearity gets really bad. I think we were able to sample cleanly at 10kHz, but not sure if you could get reasonable data from a step (blade pass) at that speed.
The company that produced the sensor we used was Microstrain, Inc.
www.microstrain.com
We used a Rotec Front-end to acquire from this transducer.