Piezoelectric vibration device

Abstract

The invention discloses a piezoelectric type vibration device. The device comprises a shell, end covers, inner bosses, piezoelectric ceramic energy converters, single-core plugs and supporting springs. The two ends of the shell are connected with the two end covers in a fastened mode respectively to form cavity space, and the inner surfaces of the end covers are connected with the inner bosses in a fastened mode. The two ends of at least one piezoelectric ceramic energy converter are clamped on the inner bosses, positive electrode wires and negative electrode wires led out of the piezoelectric ceramic energy converters are connected with the two single-core plugs respectively, and the two single-core plugs are fixed to the end cover at one end of the shell. The two supporting springs are fixed to the outer surfaces of the two end covers respectively.

Description

technical field [0001] The invention relates to the technical field of acoustic logging, in particular to a piezoelectric vibration device. Background technique [0002] Since the 1960s, various dipole sound source devices have been widely proposed and applied. Conventional acoustic logging dipole sound source, such as the piezoelectric triplet sound source device used by Baker-Atlas and Halliburton, the piezoelectric triplet sound source device includes piezoelectric The vibration device is composed of four identical long-film transducers and four identical short-film transducers arranged symmetrically along the circumference at an angle of 90 degrees, and formed by four long-film transducers and four short-film transducers Two transducer arrays are arranged up and down, and each long sheet transducer and short sheet transducer at the same angular position are arranged in parallel in the length direction. The reason why long and short transducers are used at the same time...

AI Technical Summary

Problems solved by technology

The reason why long and short transducers are used at the same time is that the single-size piezoelectric ceramic triple stack transducer often has a limited operating frequency bandwidth, and due to the lack of small strain of the piezoelectric ceramic material itself, it is difficult to operate at low frequencies. Achieving large amplitudes makes it difficult to improve radiation performance at low frequencies

[0003] Although the use of long and short transducers at the same time can achieve the widening of the entire working frequency band through the superposition of different modes, it is often difficult to reduce the vertical dimension of the structural device, which is not conducive to the realization of the requirements for downhole measurement on the size of the instrument

In addition, since there are four transducers in the same row in the prior art and the transducers are symmetrically arranged at an angle of 90 degrees in the circumferential direction and fixed on the frame, the radiation surface of the piezoelectric vibration device can only It is the four-piece transducer, so for the shell placed outside the piezoelectric vibration device, the window opening angle is limited, and at high frequencies, it is easy to generate a hexapole signal, thereby interfering with the dipole signal

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