Patent ID: 7107853
Filing Date: 2006-09-19
Classification: G01L

Abstract:
1. A pressure transducer for simultaneously measuring a low dynamic pressure in the presence of a high static pressure, comprising: a housing; first and second sensors in said housing and each having: a diaphragm having first and second oppositely disposed surfaces and that deflects according to the magnitude of an applied pressure, at least one pressure sensing element located on said diaphragm and operative to provide an output signal substantially proportional to said applied pressure, said second sensor having a diaphragm that is thinner than said diaphragm of said first sensor, and a tube extending from said housing, opening to the second surface of the second sensor and having a length L, wherein the low dynamic pressure is of a frequency f greater than c/4L, where c is the speed of sound; wherein said first sensor provides an output signal substantially proportional to said high static pressure responsively to applying the low dynamic pressure in the presence of the high static pressure to the first surface thereof, and wherein the tube attenuates the low dynamic pressure as a function of its length L, and said second sensor provides an output signal substantially proportional to said low dynamic pressure, both responsively to applying the low dynamic pressure in the presence of the high static pressure to the first surface thereof and the tube.