Patent ID: 6536288
Filing Date: 2003-03-25
Classification: G01L

Abstract:
A capacitive differential pressure sensor comprising:a. two glass carrier plates; and b. a diaphragm plate of silicon serving as a first electrode and with a pressure-sensitively deflectable region arranged between said two carrier plates; said diaphragm plate and each carrier plate being integrally connected to one another in their edge region by anodic bonding such that each of said two carrier plates combine with said diaphragm plate to form a measuring chamber, each of said carrier plates having a pressure supply duct, which runs perpendicular to the contact surfaces of said diaphragm plate and of said carrier plates and through which the respective measuring chamber can be pressurized, the surfaces of said carrier plates lying adjacent said deflectable region of said diaphragm plate forming a first electrode and said surfaces of said carrier plates lying opposite the deflectable region of the diaphragm plate are each provided with a metallization, serving as a second electrode, in such a way that the first electrode and the second electrodes form a differential-pressure-dependent capacitor arrangement said diaphragm plate having for a prescribed measuring range within the same measuring chambers a plurality of mutually independent deflectable regions as measuring diaphragms for in each case a part-sensor with a part-measuring range, the overlapping of all the part-measuring ranges of the part-sensors being equal to the prescribed measuring range of the differential pressure sensor, and the displacement of the measuring diaphragms of each part-sensor is mechanically limited outside its part-measuring range.