METHOD OF MULTIPOINT MEASUREMENT OF PRESSURE AND DEVICE FOR ITS REALIZATION Russian patent published in 2004 - IPC

FIELD: measurement technology, determination of pressure in many points. SUBSTANCE: method of multipoint measurement of pressure is implemented by placement of N piezoresonance pressure transducers in controlled points. Piezoresonance pressure transducers with different resonance frequencies ω_p1, ω_p2, ... ω_pi, ... ω_pN, which are connected in parallel by two-wire line are employed to measure resonance frequencies. Signal of alternating voltage with amplitude- frequency spectrum overlapping frequency range of piezoresonance pressure transducers is fed to one input of line. Input alternating current i_in(t) of two-wire line is recorded, its amplitude- frequency spectrum S(ω) is computed and resonance frequencies of piezoresonance pressure transducers are established by position of maxim of amplitude-frequency spectrum S(ω). Sought-for pressure in controlled points is found proceeding from them by experimentally determined or theoretically known in advance dependences of resonance frequency of piezoresonance pressure transducers on pressure value ω_pi(P). Device for realization of method incorporates N piezoresonance pressure transducers connected to converter with frequency output which is coupled to frequency meter. Piezoresonance pressure transducers have different resonance frequencies and are connected in parallel by means of two-wire line. Converter with frequency output incorporates matching circuit and generator of signal with spectrum overlapping frequencies of quartz piezoresonance transducers connected to first input of matching circuit, second input of matching circuit is coupled to two-wire line. Output of matching circuit is connected to frequency meter incorporating recorder of AC amplitude, spectrum analyzer, processing and indication unit connected in series. EFFECT: decreased number of wires connecting assemblage of discrete piezoresonance pressure transducers to measurement system. 2 cl, 2 dwg, 1 tbl