Patent ID: 7360446

Claim:
A fluidic oscillation flow meter comprising: a housing defining: an inlet for receiving a fluid; and first and second diversion channels for alternatively receiving the fluid from the inlet; the housing comprising: a first nozzle for receiving the fluid from the first diversion channel and deflecting the fluid from the inlet into the second diversion channel; a second nozzle for receiving the fluid from the second diversion channel and deflecting the fluid from the inlet into the first diversion channel; and a layer of material adjacent the first diversion channel including a first sensing area that distorts due to a pressure change caused by the fluid flowing through the first diversion channel; a first sensing piezoresistor positioned on the layer of material near the first diversion channel for detecting the pressure change of the first sensing area; a first reference piezoresistor positioned on the layer of material and effectively removed from said sensing area such that mechanical deformation of said first sensing area does not substantially actuate the resistance of the reference piezoresistor, the reference piezoresistor coupled to the first sensing piezoresistor for generating a frequency signal; and an outlet for purging the fluid.