SENSOR TEMPERATURE CONTROL IN THERMAL TYPE ANEMOMETER

PROBLEM TO BE SOLVED: To provide a thermal type anemometer system capable of avoiding self-heating in an ambient temperature sensor, preventing a calibration error from occurring caused by mutual connection wiring, and allowing an easy operation in various velocity range. SOLUTION: In this thermal t...

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Hauptverfasser:	HEUER DANIEL A, CASPARI FREDERICK W
Format:	Patent
Sprache:	eng
Schlagworte:	INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT MEASURING MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION,OR SHOCK MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUIDLEVEL METEOROLOGY METERING BY VOLUME PHYSICS TESTING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a thermal type anemometer system capable of avoiding self-heating in an ambient temperature sensor, preventing a calibration error from occurring caused by mutual connection wiring, and allowing an easy operation in various velocity range. SOLUTION: In this thermal type anemometer, sensor heating is separated from sensor temperature measurement by switching type sampling technology. This technique has advantages compared with a general circuit using a bridge for conducting the heating of the sensor and detection of an environmental sensor temperature and a velocity sensor temperature at the same time. In the thermal type anemometer concerned in the present invention, the sensor temperature is determined by a sampled resistance value. The sensor temperature is controlled by changing a voltage impressed to the sensor, using an error value determined based on a difference between actual sensor resistance and desired resistance. COPYRIGHT: (C)2004,JPO&NCIPI