RESONANCE ACOUSTICAL LEVEL METER Russian patent published in 2005 - IPC

FIELD: measuring engineering.

SUBSTANCE: level meter comprises measuring pipe, electroacoustical converter, noise signal generator, two microphone, amplifier, analogue-digital converter, first Fourier transform circuit, logarithmic-computing unit, second Fourier transform circuit, fluid level computing unit whose output is connected with the fluid level indicator. The level meter additionally includes analogue signal commutator and unit for extracting two maximums of the kernel function. The both of the microphones are arranged along the measuring pipe at a given distance from each other and are connected with the inputs of the analogue signal commutator. The output of the second Fourier transform circuit is connected with the input of the unit for extracting two maximums of the kernel function, whose output is connected to the input of the fluid level computing unit, and the amplifier is provided with the AGC circuit.

EFFECT: enhanced noise immunity and reliability.

1 dwg