The Effects of Backing and Matching on the Performance of Piezoelectric Ceramic Transducers

15Purpose: Photoacoustic imaging has proven to be able to detect vascularization-driven optical absorption contrast associated with tumors. In order to detect breast tumors located a few centimeter deep in tissue, a sensitive ultrasound detector is of crucial importance for photoacoustic mammography. Further, because the expected photoacoustic frequency bandwidth (a few MHz to tens of kHz) is inversely proportional to the dimensions of light absorbing structures (0.5 to 10+ 20 mm), proper choices of materials and their geometries and proper considerations in design have to be made to implement optimal photoacoustic detectors. In this study, we design and evaluate a specialized ultrasound detector for photoacoustic mammography.Methods: Based on the required detector sensitivity and its frequency response, a selection of active material and matching layers and their geometries is made leading to a functional detector

show abstract

“…The theoretical values for the suitable acoustic impedance of the matching layers (Z m ) can be determined by [35,38]:…”

mentioning

confidence: 99%

An optimized ultrasound detector for photoacoustic breast tomography

et al. 2013

View full text Add to dashboard Cite

show abstract

“…Kossoff improved the Mason equivalent model and analyzed the effects of backing and matching on the performance of the transducers [9]. Because of the large impedance mismatch between transducer and water load, bandwidth of the transducer is very small.…”

Section: Related Work On Sandwich Type Transducersmentioning

confidence: 99%

“…Note that Mason equivalent model, given in Fig. 2, is used for the equivalent circuit of the PZT materials [3,8,9,15]. …”

Section: Design Of a Back-to-back Transducer By Using Electromechanicmentioning

confidence: 99%

The design of a wideband and widebeam piston transducer in a finite closed circular baffle

Sahin

Köymen

2008

The Journal of the Acoustical Society of America

View full text Add to dashboard Cite

The design of a high power piezoelectric underwater transducer operating at frequency range 42 kHz-78 kHz with acoustic power capability in excess of 250W is described. The transducer consists of two back-to-back elements. Each element is formed by stacked PZT-4 ceramic rings, a matching and a steel backing layer, and placed in a finite rigid circular baffle. We investigate the dependence of bandwidth and beamwidth to the combination of piston and baffle radii, a and b, respectively. With ka of 2.45 (k is the wave number) at resonance and a b/a ratio of 2, the transducer resonates at 60kHz with 60% bandwidth and has a beamwidth of 60º at each half space. We show that when two transducers are placed at right angles spatially and driven in parallel, we can obtain an omnidirectional beam pattern in the lower frequency band. The beam pattern exhibits two dips in each quadrant at the higher end of the frequency band, which are within 8 dB. We also investigate power handling capability of the transducer from thermal point of view using finite element analysis. The input impedance measurements agree well with the numerical results within the pass band.

show abstract

“…Increasing the amount of tungsten above this produced marginal improvements. Kossoff (1966) found that a onee-quarter wavelet th layer matched to the load and a low-impedance, backing that was also a onequarter waveleigt~h thick gave the hest handwidt-h , with reduced sonsitivi v…”

mentioning

confidence: 97%

Impacts as a source of acoustic pulse-echo energy for nondestructive testing of concrete structures

1997

NDT & E International

View full text Add to dashboard Cite

The Effects of Backing and Matching on the Performance of Piezoelectric Ceramic Transducers

Cited by 243 publications

References 9 publications

An optimized ultrasound detector for photoacoustic breast tomography

An optimized ultrasound detector for photoacoustic breast tomography

The design of a wideband and widebeam piston transducer in a finite closed circular baffle

Impacts as a source of acoustic pulse-echo energy for nondestructive testing of concrete structures

Contact Info

Product

Resources

About