Patent ID: 7188528
Filing Date: 2007-03-13
Classification: G01L

Abstract:
1. A filter for use with a differential transducer for providing at an output a voltage proportional to a low dynamic pressure P d at a high frequency in the presence of a higher static pressure P s at a lower frequency, said transducer operative to receive said static and dynamic pressures P s and P d on a top surface and to receive only said static pressure P s at a bottom surface due to a filter operation for suppressing said dynamic pressure as applied to said bottom transducer surface, said differential transducer therefore providing an output indicative only of said dynamic pressure P d due to the cancellation of said static pressure P s , said filter comprising: a semiconductor wafer positioned proximate said bottom surface of said transducer and having high frequency attenuation means positioned thereon to enable said wafer to receive both said static and dynamic pressures at an input end and to provide only said static pressure at an output end proximate to said bottom transducer surface to cause said transducer to provide an output strictly proportional to said dynamic pressure.