G - Physics – 01 – L
Patent
G - Physics
01
L
G01L 9/00 (2006.01) G01L 23/08 (2006.01) G01P 5/14 (2006.01)
Patent
CA 2339313
To compensate for the inherent non-linearity of pressure to speed measurement, an electronics module has been developed that converts the non- linear pressure signal from the analog pressure sensor to a linear frequency signal. In a preferred embodiment of the present invention, a microcontroller with analog-to- digital processing capabilities is used to convert a non-linear pressure signal to a linear frequency signal. Under microprogram control, the microcontroller reads the analog signal from the sensor and calculates the required program constants to generate a linear output frequency. Thus, the present invention removes the square law response relationship of speed to pressure captained in the equation: PRESSURE = (SPEED/8.208)~2. Therefore, any standard frequency input analog or digital speedometer can be used in conjunction with non-linear pressure sensors. In a preferred embodiment, two analog sensors are used for speed input, wherein input is received from one or the other of the two sensors based upon a switch chat is selectable by either the microcontroller or the operator.
Gharagozloo Mahmood
Reaves Samuel H. III
Mannesmann Vdo Ag
Smart & Biggar
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