Micro gust thermal anemometer

Details Micro gust thermal anemometer Micro gust thermal anemometer

2008-06-03

2008-06-03

Patel, Harshad (Department: 2855)

Measuring and testing

Volume or rate of flow

Using turbine

Reexamination Certificate

active

07380471

ABSTRACT:
A thermal anemometer for measuring airflow includes an ovenized semiconductor device including an internal oven. The oven is powered by an oven current such that the oven current varies with air flow over an outside surface of the semiconductor device. A resistor is electrically coupled between a source of power and the oven. An amplifier has an amplifier input and an amplifier output. The amplifier input is electrically coupled to the oven, wherein the amplifier output amplifier provides an electrical signal related to airflow over the ovenized semiconductor device. Also, a method for measuring airflow includes the steps of: providing a source of power, providing an ovenized semiconductor device, providing an amplifier, amplifying a signal representative of a heater current in the ovenized semiconductor device, and outputting the signal representative of the heater current as an indication of airflow over an outside surface of the ovenized semiconductor device.

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patent: 5616846 (1997-04-01), Kwasnik
patent: 2007/0013389 (2007-01-01), Grudin et al.
Joe Geller, Micro Gust Thermal Anemometer (MGTA), Nuts & Volts Magazine, Feb. 2006, pp. 40-44, Corona, CA 92879.
LM199/LM299/LM399 Precision Reference, National Semiconductor Corporation, Apr. 2005, DS005717.
Geller Labs MGTA kits, <http://www.gellerlabs.com/MGTA%20kits.htm>, Feb. 2006.
Jim Christensen, Low-Cost Anemometer Fights Dust, Design Ideas, EDN Magazine, Aug. 30, 2001, p. 102-103.
W. Stephen Woodward, Series-Connected Transistors Use Differential Heating To Sense Airlow, electronic design magazine, May 7, 2001.
Stephen Woodward, Self-Heated Transistor Digitizes Airflow, Design Ideas, EDN Magazine, Mar. 14, 1996.

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