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Researchers

  • Albert Helfrick
  • Michael Potash

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Details

Project TitleAn Improved Design for A Constant-Temperature Hot Wire Anemometer
Track Code2015-003
Short DescriptionA hot wire anemometer circuit has a calibrate subcircuit and an operate subcircuit which are selectively invoked via a user-activate mode switch. The calibrate subcircuit includes a detector configure
AbstractA hot wire anemometer circuit has a calibrate subcircuit and an operate subcircuit which are selectively invoked via a user-activate mode switch. The calibrate subcircuit includes a detector configured to compare an amplified sensor voltage with an amplified drive voltage and output an indicator signal when the two voltages match. The drive voltage is derived from a user-adjusted drive resistance of a bridge subcircuit. The operate circuit includes a feedback loop which provides a signal to a bride node of a bridge circuit. After a sensor is connected to the anemometer circuit, the drive resistance is adjusted until the indicator signal is produced, signifying that the circuit is tuned and impedances are matched to prevent oscillations. A slewing network protects the sensor by shorting the drive resistance upon switching the anemometer circuit to the calibrate mode from the operate mode, and gradually restoring the drive resistance when switching back.
 
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Posted DateAug 9, 2016 11:14 AM

Researcher

Name
Michael Potash
Albert Helfrick

Manager

Name
Stephanie Miller

Files

File Name Description
US 2016/0216292 Published U.S. Utility Application Download