APPARATUS FOR GRADING ELECTROACOUSTIC TRANSDUCERS Russian patent published in 2022 - IPC H04R29/00 

FIELD: measuring equipment.

SUBSTANCE: invention relates to the field of acoustic measurements and hydroacoustics. Apparatus for grading electroacoustic transducers comprises an emitting path including a harmonic oscillation generator, a pulse modulator, a synchroniser, a power amplifier, a frequency meter, an emitting electroacoustic transducer, a receiving path including a reference receiving electroacoustic transducer and the graded one, an analogue key for switching the receiving electroacoustic transducers, an amplifier, a filter unit, a strobe unit, a control unit for the emitting and receiving paths, and a plugged pool for placing the electroacoustic transducers, containing a coordinate system for installing and moving the transducers. The novel feature of the invention consists in additionally including a second harmonic oscillation generator, an adder, an amplitude detector, a low-frequency filter, a matching amplifier and a band-rejection filter into the emitting path, wherein the outputs of both harmonic oscillation generators are connected with the two signal inputs of the adder, the first output whereof is connected via the pulse modulator, the matching amplifier, the power amplifier and the band-rejection filter with the input of the emitting electroacoustic transducer, the second output of the adder is connected via the amplitude detector and the low-frequency filter with the signal input of the frequency meter, and the outputs of the control unit are connected with the control inputs of both harmonic oscillation generators, the synchroniser, the frequency meter, and the analogue key.

EFFECT: apparatus for grading electroacoustic transducers has expanded operating capabilities of the apparatus and increases the accuracy and frequency range of measurements.

3 cl, 5 dwg