PRESSURE MEASURING DEVICE Russian patent published in 2016 - IPC G01L11/00 

FIELD: measuring equipment.

SUBSTANCE: invention can be used in pressure sensors. Pressure measuring device consists of rod, first, second and third piezoelectric elements. Rod is rigidly connected to the first and third piezo elements, the first bridge measuring circuit formed by differential capacitance transducer consisting of the first capacitor C₁ and the second capacitor with₂, as well as resistors R₁ and R₂, first rejection filter, first charge amplifier, second rejection filter, a second charge amplifier, high-frequency generator, the first unbalance signal amplifier the bridge measuring circuit, rectifier, DC power supply formed thermistors R₃ and R₄, as well as resistors R₄ and R₅, second unbalance signal amplifier the bridge measuring circuit and microcontroller. Outputs of the first and third piezoelectric elements are connected to the first input of A₁ of the microcontroller through the first band-stop filter and first charge amplifier. Outputs of the second piezoelectric element are connected to the second input of the microcontroller A₂ via second band-stop filter and the second charge amplifier. High-frequency generator outputs are connected to the third input A₃ of the microcontroller through the first bridge measuring circuit, the first unbalance signal amplifier the bridge measuring circuit and rectifier. DC source outputs are connected through the second bridge measuring circuit with the fourth input A₄ of the microcontroller through the second amplifier offset bridge measuring circuit.

EFFECT: technical result consists in improvement of measurement accuracy, as well as increase of functional capabilities.

1 cl, 4 dwg