Ultrasonic transducer for the determination of the acoustic power of a focused ultrasonic field

1989 ◽  
Vol 85 (2) ◽  
pp. 986-986
Author(s):  
Bernd Granz ◽  
Peter Krämmer ◽  
Bertram Sachs
Keyword(s):  
Ultrasonic Transducer ◽  
Acoustic Power ◽  
Ultrasonic Field

Changes of some sewage sludge parameters prepared with an ultrasonic field

1997 ◽  
Vol 36 (11) ◽  
pp. 101-106 ◽  
Author(s):  
January Bien ◽  
Lidia Wolny
Keyword(s):  
Sewage Sludge ◽  
Microscopic Analysis ◽  
Chemical Compounds ◽  
Ultrasonic Field ◽  
Water Removal ◽  
Vacuum Filter ◽  
Additional Criterion ◽  
New Methods ◽  
Sludge Conditioning

Studies of sewage sludge conditioning by ultrasonic field concentrate on determination of the increase of water removal effect, which depends on kind of sludge and chemical compounds used in the dewatering process. An attempt was made to find new methods of sludge preparation before dewatering. Tests presented here focused on digested and difficult dewatered sludge. The sludge was dewatered on a vacuum filter after conditioning with polyelectrolytes and the ultrasonic field. The microscopic analysis was an additional criterion to evaluate changes in the sludge structure after preparation. The polyelectrolyte dose of 3 mg/g d.m. sonicated within 15 sec. resulted in the 50% decrease of sludge volume. Results presented confirmed our previous experiences, concerning the relation between conglomerates of sludge and the effect of dewatering.

On the Determination of the Acoustic Power of a Source of Sound in Semi‐Reverberant Spaces

Noise Control ◽  
1961 ◽  
Vol 7 (1) ◽  
pp. 21-29 ◽  
Author(s):  
R. J. Wells ◽  
Francis M. Wiener
Keyword(s):  
Acoustic Power

Determination of the heat transfer coefficients for the combined natural and streaming convection on an ultrasonic transducer

2013 ◽  
Vol 62 ◽  
pp. 402-410 ◽  
Author(s):  
Stevens-Valéry Orandrou ◽  
Jean-Claude Roy ◽  
Yannick Bailly ◽  
Emmanuel Poncet ◽  
Laurent Girardot ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Ultrasonic Transducer ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients

An absolute method for determination of misalignment of an immersion ultrasonic transducer

Ultrasonics ◽  
2014 ◽  
Vol 54 (8) ◽  
pp. 2081-2089 ◽  
Author(s):  
M.M. Narayanan ◽  
Narender Singh ◽  
Anish Kumar ◽  
C. Babu Rao ◽  
T. Jayakumar
Keyword(s):  
Ultrasonic Transducer ◽  
Absolute Method

Near-Field Uniform Beams for Pulsed Doppler Ultrasound

1980 ◽  
Vol 2 (4) ◽  
pp. 324-337 ◽  
Author(s):  
Chong-Cheng Fu ◽  
Sharbel E. Noujaim ◽  
Robert S. Jaffe ◽  
Levy Gerzberg ◽  
Roger D. Melen
Keyword(s):  
Flow Measurement ◽  
Pattern Analysis ◽  
Ultrasonic Transducer ◽  
Near Field ◽  
Ultrasonic Field ◽  
Beam Pattern ◽  
Field Approach ◽  
Pulsed Doppler Ultrasound ◽  
Pulsed Ultrasonic

A mathematical model for the beam pattern of a pulsed ultrasonic transducer is introduced. Beam-pattern analysis and simulation of a circular transducer based on this model agree well with the experimental results. It is demonstrated that, in its near field, the pulsed transducer is capable of generating a good approximation to a uniform ultrasonic field which cannot be achieved with a cw transducer. Preliminary error analysis indicates that the near-field beam pattern of the pulsed transducer is suitable for quantitative blood-flow measurement, and design criteria are developed for this application. A prototype has been fabricated and tested in in-vitro experiments, and the results verify the feasibility of the quantitative blood flowmeter principle and the pulsed-transducer near-field approach to the formation of uniform beams.

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