Method of troubleshooting an underwater acoustic transducer array

1987 ◽  
Vol 82 (6) ◽  
pp. 2165-2165
Author(s):  
Wolfgang Stedtnitz
Keyword(s):  
Transducer Array ◽  
Underwater Acoustic ◽  
Acoustic Transducer

Development of Automated Measurement Setup for Characterizing Underwater Acoustic Transducers

2016 ◽  
Vol 50 (6) ◽  
pp. 69-75
Author(s):  
Amirthalingam Malarkodi ◽  
Peddinti SSR Sridhar ◽  
Ganesan Latha
Keyword(s):  
Accurate Determination ◽  
Motion Controller ◽  
Report Generation ◽  
Underwater Acoustic ◽  
Acoustic Transducers ◽  
Acoustic Transducer ◽  
Measurement Results ◽  
Computer Based ◽  
Calibration Program

AbstractAccurate determination of sensitivity and directivity is important for any underwater acoustic transducer. In this work, an automatic measuring platform was designed and implemented for characterizing underwater acoustic transducers. The overall hardware setup includes a PXI (PCI Extensions for Instrumentation)-based data acquisition system, computer-based controller module, motion controller module, and LabVIEW-based automatic calibration program. The system performs a sequence of operations automatically and achieves synchronous control of transmission and acquisition of real-time acoustic signals as well as processing, recording, and report generation. This measurement platform can be utilized for characterizing any type of acoustic transducer for its receiving sensitivity, transmitting response, and directivity measurement as per IEC60565 standard. The measurement results for RESON TC4034 and RESON TC 2080 transducers are presented and the results show that the system is able to carry out accurate calibration and characterization of any underwater acoustic transducer. Sources of uncertainty for calibration are also presented with the confidence level of approximately 95%.

scholarly journals Simulation of an Electromagnetic Acoustic Transducer Array by Using Analytical Method and FDTD

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Yuedong Xie ◽  
Sergio Rodriguez ◽  
Wenbo Zhang ◽  
Zenghua Liu ◽  
Wuliang Yin
Keyword(s):  
Analytical Solution ◽  
Time Domain ◽  
Fdtd Method ◽  
Force Density ◽  
Large Radius ◽  
Electromagnetic Acoustic Transducer ◽  
Transducer Array ◽  
Ultrasound Waves ◽  
Acoustic Transducer ◽  
Frequency Regime

Previously, we developed a method based on FEM and FDTD for the study of an Electromagnetic Acoustic Transducer Array (EMAT). This paper presents a new analytical solution to the eddy current problem for the meander coil used in an EMAT, which is adapted from the classic Deeds and Dodd solution originally intended for circular coils. The analytical solution resulting from this novel adaptation exploits the large radius extrapolation and shows several advantages over the finite element method (FEM), especially in the higher frequency regime. The calculated Lorentz force density from the analytical EM solver is then coupled to the ultrasonic simulations, which exploit the finite-difference time-domain (FDTD) method to describe the propagation of ultrasound waves, in particular for Rayleigh waves. Radiation pattern obtained with Hilbert transform on time-domain waveforms is proposed to characterise the sensor in terms of its beam directivity and field distribution along the steering angle, which can produce performance parameters for an EMAT array, facilitating the optimum design of such sensors.

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