Development of a Methodology for the Characterisation of Air-coupled Ultrasound Probes
- Department of Mechanics, Univ. Politecnica delle Marche, via Brecce Bianche 60131 Ancona (Italy)
This study is aimed at developing a technique for the characterisation of air-coupled ultrasound probes, starting from the analysis of the mechanical behaviour of the probe membrane. The vibratory behaviour of the emission membrane is studied using laser-Doppler vibrometry techniques with high frequency demodulation system (20 MHz). The determination of the vibration provides information which are useful for the assessment of the performance of the probe, in particular concerning the Quality factor and the portion of the membrane which really contributes to the emission. During the second step the results of the vibration measurements are used to calculate, by means of numerical boundary element method, the ultrasound beam emitted in terms of intensity in space. The obtained field is compared with the direct measurements carried out by scanning with the receiver probe and a pinhole plate. This comparison allows the potential and the problems of the two different characterisation techniques to be determined, even if the pinhole technique (which is currently considered the state of the art) cannot be used as an absolute reference. This study appears to be useful for paving the way for a new methodology for the calibration of air-coupled ultrasound probes, which potentially could be used not only to improve the probe manufacturing process, but also to control conformity to specifications.
- OSTI ID:
- 21366738
- Journal Information:
- AIP Conference Proceedings, Vol. 1253, Issue 1; Conference: 9. international conference on vibrational measurements by laser and non-contact techniques and short course, Ancona (Italy), 22-25 Jun 2010; Other Information: DOI: 10.1063/1.3455447; (c) 2010 American Institute of Physics; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
BOUNDARY ELEMENT METHOD
CALIBRATION
FREQUENCY MEASUREMENT
MEMBRANES
MHZ RANGE 01-100
PIEZOELECTRICITY
PROBES
QUALITY FACTOR
SPECIFICATIONS
ULTRASONIC WAVES
CALCULATION METHODS
DIMENSIONLESS NUMBERS
ELECTRICITY
FINITE ELEMENT METHOD
FREQUENCY RANGE
MATHEMATICAL SOLUTIONS
MHZ RANGE
NUMERICAL SOLUTION
SOUND WAVES