Patent ID: 6474168
Filing Date: 2002-11-05
Classification: G01L,G01N

Abstract:
A pressure sensor for measuring absolute dynamic pressure, comprising:a frame; a reference chamber; a diaphragm attached to said frame, with said diaphragm comprising a thin planar structure having an outer edge, a measurement side that is to face a surrounding environment, and a rear side facing said reference chamber; a first attachment structure interconnecting said frame and a first section of said outer edge of said diaphragm; a second attachment structure interconnecting said frame and a second section of said outer edge of said diaphragm; a restriction that is to interconnect said reference chamber and the surrounding environment such that said reference chamber is in fluid communication with the surrounding environment; and a signal-generating element to detect mechanical stress in at least one of said first attachment structure and said second attachment structure, wherein at least one of said first attachment structure and said second attachment structure provides a reduced area where mechanical stresses caused by pressure are concentrated, and said signal-generating element is arranged at said reduced area, and wherein sections of said outer edge of said diaphragm other than said first section and said second section are separated from said frame by slits, with a combination of said slits constituting said restriction.