Developments in electromagnetic (variable reluctance) transducers for the generation of low‐frequency, high‐power underwater sound

1994 ◽  
Vol 95 (5) ◽  
pp. 2832-2832
Author(s):  
Donald P. Massa
Keyword(s):  
High Power ◽  
Low Frequency ◽  
Underwater Sound ◽  
Variable Reluctance

Response of the Lungs to Low Frequency Underwater Sound.

1994 ◽  
Author(s):  
Peter H. Rogers ◽  
Gary W. Caille ◽  
Thomas N. Lewis
Keyword(s):  
Low Frequency ◽  
Underwater Sound

scholarly journals Study and Application of Heat Self-generated gases Flooding for Enhance Heavy Oil Recovery with Low-frequency High-power Harmonic Wave

2021 ◽  
Vol 634 (1) ◽  
pp. 012085
Author(s):  
Qin Guowei ◽  
Zheng Yanzhao ◽  
Jin Rongbo ◽  
Wang Jing ◽  
Zhang Beilei ◽  
...  
Keyword(s):  
Oil Recovery ◽  
High Power ◽  
Heavy Oil ◽  
Harmonic Wave ◽  
Low Frequency ◽  
Heavy Oil Recovery

scholarly journals D-Dot Sensor Response Improvement in the Evaluation of High-Power Microwave Pulses

Electronics ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 123
Author(s):  
Jacek Jakubowski ◽  
Marek Kuchta ◽  
Roman Kubacki
Keyword(s):  
High Power ◽  
Critical Infrastructure ◽  
Quantitative Description ◽  
Low Frequency ◽  
Digital Processing ◽  
High Energy ◽  
Time Duration ◽  
High Power Microwave ◽  
Time Waveform ◽  
Power Microwave

This article investigates the issue of measuring high-power microwave (HPM) pulses. The high energy of these pulses poses a significant threat to many electronic systems, including those used to manage critical infrastructure. This work focuses on requirements for a potential portable measurement device and suggests the application of a method for this purpose, involving the use of a D-dot sensor and a rapid A/D converter. The applied converter enables recording the time waveform on the measuring chain output, also in the case of repetition and time duration of HPM signals. The authors also present a quantitative description of signal processing by the analogue section of the measurement chain solution presented herein and suggest algorithms for digital processing of the signals, the objective of which is to minimize low-frequency interference in the process of reconstructing the time waveform of an electric field using numerical integration.

scholarly journals Spiral Sound Wave Transducer Based on the Longitudinal Vibration

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3674 ◽  
Author(s):  
Wei Lu ◽  
Yu Lan ◽  
Rongzhen Guo ◽  
Qicheng Zhang ◽  
Shichang Li ◽  
...  
Keyword(s):  
Sound Wave ◽  
Longitudinal Vibration ◽  
Three Dimensional ◽  
Low Frequency ◽  
Sound Field ◽  
Field Measurements ◽  
Sound Waves ◽  
Underwater Sound ◽  
Three Dimensional Finite Element ◽  
Wave Transducer

A spiral sound wave transducer comprised of longitudinal vibrating elements has been proposed. This transducer was made from eight uniform radial distributed longitudinal vibrating elements, which could effectively generate low frequency underwater acoustic spiral waves. We discuss the production theory of spiral sound waves, which could be synthesized by two orthogonal acoustic dipoles with a phase difference of 90 degrees. The excitation voltage distribution of the transducer for emitting a spiral sound wave and the measurement method for the transducer is given. Three-dimensional finite element modeling (FEM)of the transducer was established for simulating the vibration modes and the acoustic characteristics of the transducers. Further, we fabricated a spiral sound wave transducer based on our design and simulations. It was found that the resonance frequency of the transducer was 10.8 kHz and that the transmitting voltage resonance was 140.5 dB. The underwater sound field measurements demonstrate that our designed transducer based on the longitudinal elements could successfully generate spiral sound waves.

A comparative fluid flow characterisation in a low frequency/high power sonoreactor and mechanical stirred vessel

2015 ◽  
Vol 27 ◽  
pp. 359-373 ◽  
Author(s):  
Baharak Sajjadi ◽  
Abdul Aziz Abdul Raman ◽  
Shaliza Ibrahim
Keyword(s):  
Fluid Flow ◽  
High Power ◽  
Low Frequency ◽  
Stirred Vessel
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