PIEZOELECTRIC PRESSURE GAUGE FOR STATIC MEASUREMENTS Russian patent published in 2023 - IPC G01L9/08 

FIELD: measuring technology.

SUBSTANCE: invention can be used to measure the static pressure of liquids, gases and as a depth sensor. A piezoelectric pressure gauge for static measurements contains a piezoceramic sensing element installed in a housing, an alternating signal generator, a capacitor and a low-pass filter. The housing, consisting of a base and a cover, has an internal volume that exceeds the volume of the sensing element, openings for connecting to highways or the medium, and sealed openings for entering wires. The piezoceramic sensitive element is made in the form of a cylinder with radial polarization, the outer and inner surfaces of which are metallized, covered with a dielectric acoustically transparent coating and attached to the protrusions of the base of the housing, which is in close contact with the lid with a sealing layer applied over the entire contact area of the parts. The output of the generator is connected through a capacitor to the input of the piezoceramic sensing element. The output of the low-pass filter, the input of which is connected to the output of the piezoelectric element, is the output of the pressure gauge, and the cutoff frequency of the filter is equal to the highest pressure frequency.

EFFECT: increased reliability of the pressure gauge for static measurements by eliminating membranes and other moving elements.

1 cl, 2 dwg