Patent ID: 6571643
Filing Date: 2003-06-03
Classification: G01N,G01P,G06F

Abstract:
A process for calculating a gas velocity vector in standard atmospheric pressure, the process comprising:providing a first transmitter element adapted to transmit ultrasonic pulses, a second transmitter element adapted to transmit ultrasonic pulses and a receiver element adapted to receive ultrasonic pulses, whereby said first transmitter is positioned a first distance from said receiver, said second transmitter is positioned a second distance from said receiver and positioned at a 90 degree angle from and coplanar with said first transmitter; transmitting a first ultrasonic pulse from said first transmitter to said receiver and calculating a first transit time for said first pulse to reach said receiver; transmitting a second ultrasonic pulse from said second transmitter to said receiver and calculating a second transit time for said second pulse to reach said receiver; calculating a first transit time differential vector by determining a first difference between said calculated first transit time and a first predetermined transit time of an ultrasonic pulse transmitted from said receiver to said first transmitter in standard atmospheric pressure; calculating a second transit time differential vector by determining a second difference between said calculated second transit time and a second predetermined transit time of an ultrasonic pulse transmitted from said receiver to said second transmitter in standard atmospheric pressure; and determining said gas velocity vector by combining said first transit time differential vector and said second transit time differential vector.