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AssigneeKulite Semiconductor Products, Inc.
InventorsAnthony D. Kurtz, Boaz Kochman, Adam Hurst, Tonghuo Shang
Estimating the term…
A filter assembly for use with a static-dynamic piezoresistive pressure transducer that measures low amplitude, dynamic pressure perturbations superimposed on top of a high static pressure through the implementation of a low-pass mechanical filter assembly is disclosed. The filter assembly may comprise a dual lumen reference tube and a removable filter subassembly further comprising a porous metal filter and narrow diameter tube. The transducer, which may be capable of operating at ultra-high temperatures and in harsh environments, may comprise of a static piezoresistive pressure sensor, which measures the large pressures on the order of 200 psi and greater, and an ultrasensitive, dynamic piezoresistive pressure sensor which may capture small, high frequency pressure oscillations on the order of a few psi or less. The filter assembly may transmit static pressure to the back of the dynamic pressure sensor to cancel out the static pressure present at the front of the sensor while keeping dynamic pressure from reaching the back of the sensor. In this manner, the filter assembly enables the transducer to accurately read dynamic pressure in the presence of high static pressure without rupturing the thin diaphragm of the dynamic pressure sensor.
A filter for use with a differential transducer for providing at an output a voltage proportional to a low dynamic pressure (Pd) at a high frequency in the presence of a higher static pressure (Ps), said transducer operative to receive said static and dynamic pressures (Ps) and (Pd) at a top surface and to receive only said static pressure (Ps) at a bottom surface due to the operation of the filter suppressing said dynamic pressure (Pd), said transducer providing an output indicative only of said dynamic pressure (Pd) due to the cancellation of said static pressure (Ps) acting upon both the top and bottom surfaces of the transducer, said filter comprising:
A low-pass filter assembly for a pressure transducer, the filter assembly comprising:
A method for providing at an output a voltage proportional to a low dynamic pressure (Pd) at a high frequency in the presence of a higher static pressure (Ps) present in an environment, the method comprising:
Dependencies are inferred from the claim text.