Research and Fabrication of High-Frequency Broadband and Omnidirectional Transmitting Transducer

Abstract

A wide-band cylindrical transducer was developed by using the wide band of the composite material and the matched matching layer for multimode coupling. Firstly, the structure size of the transducer’s sensitive component was designed by using ANSYS simulation software. Secondly, the piezoelectric composite ring-shaped sensitive component was fabricated by the piezoelectric composite curved-surface forming process, and the matching layer was coated on the periphery of the ring-shaped piezoelectric composite material. Finally, it was encapsulated and the electrodes were drawn out to make a high-frequency broadband horizontal omnidirectional water acoustic transducer prototype. After testing, the working frequency range of the transducer was 230–380 kHz, and the maximum transmission voltage response was 168 dB in the water.

Wideband and Wide Beam Polyvinylidene Difluoride (PVDF) Acoustic Transducer for Broadband Underwater Communications

“…A more recent work presented by S. Hao [9] describes the development of a broadband and omnidirectional emitter transducer. A cylindrical transducer was developed by using piezoelectric ceramic elements alternating with a flexible polymer and a matching layer for multimode coupling.…”

Biomimetic and flexible piezoelectric mobile acoustic sensors with multiresonant ultrathin structures for machine learning biometrics

“…(ii) The PMAS was composed of an ultrathin polyethylene terephthalate (PET) substrate, a stress-controlled piezoelectric membrane and multichannel interdigitated electrodes (IDEs). The 4.8-μm thick polymer membrane with low quality factor (Q factor) was able to cover the entire voice frequency range by broadening the resonant bandwidth of PMAS ( 24 – 26 ). The inorganic-based laser lift-off (ILLO) technique was used for the PMAS, as shown in Materials and Methods and fig.…”

Temperature deformation of 1‐3 cylindrical curved composite

“…To expand the beam‐width and bandwidth of high‐frequency transducer, a series of curved transducers were developed to use in high‐resolution underwater detection and imaging. The present cylindrical underwater transducer has achieved omnidirectional coverage in horizontal plane and the doubly curved underwater transducer can increase both the horizontal and vertical beam‐width of the sensor 6,7 …”

“…The present cylindrical underwater transducer has achieved omnidirectional coverage in horizontal plane and the doubly curved underwater transducer can increase both the horizontal and vertical beam-width of the sensor. 6,7 The performance of these transducers is stabled at room temperature, but when the ambient temperature changes sharply during transportation and storage, the two-phase materials will cause different degrees of deformation due to different thermal expansion coefficients of piezoelectric ceramics and polymers. The deformation of piezoelectric composite material will produce frequency drift which affects the frequency uniformity of the transducer matrix elements, or cause the change of beam opening angle of transducer, and reduce the positioning accuracy of sonar system.…”