where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -
Technical Discussions
Dipl.-Ing. Martin Heinz
Dipl.-Ing. Martin Heinz
07:20 Jul-22-2004
Calculation of the focus-width of a focused ultrasonic transducer

The focus depth of a lens-focused transducer is easily to calculate by the lens formula of the geometric optic. If we use the trigonometry we can calculate the focus-range (depending from aperture) using the formula F = R*(1 + 1/(squareroot((CLens*CLens)/(CMed*CMed)-(A*A)/(4*R*R))-squareroot(1-(A*A)/(4*R*R))), where R is the lens radius, A the aperture, F, the focus, CMed the longitudinal speed of sound in the medium and CLens the longitudinal speed of sound in the acoustic lens. If we calculate F for the border "sound beam" (at A) and F for the middle "sound beam" we get the focus range. For R >> A we get the common known lens formula and a single focus point.
But how can be calculated the sound beam width within the focus? I know from literature, that the focus area has a elliptic form. But I did not find a formular for calculating the beam width within the focus range of a lens-focused transducer. Does anyone know any paper containing the calculation of the elliptic focus zone and the way to get this calculation?


Product Spotlight

A1525 SOLO

A1525 Solo – the most compact and affordable TMF unit with two phased array transducers and 3D v
isualization and analysis software in standard delivery set. A compact, ergonomic and easy to handheld Phased Array unit based on Total Focusing Method for easy-going imaging of inspection objects with two-dimensional and three-dimensional visualization and evaluation of inspection results.


Teledyne ICM’s CPSERIES has been designed with a view to revolutionizing the handling and perfor
mances of portable X-Ray sets. Despite having managed to halve the weight of similar portable X-Ray generators available on the market (while continuing to provide the same power output), the SITEX CPSERIES generators feature a shutter, a laser pointer, a beryllium window, an aluminum filter and two integrated diaphragms (customized sizes are available upon request). Without compromising the robustness and reliability for which ICM products are renowned, the small size and light weight of the SITEX CPSERIES will radically change the way that you perform your RT inspections. And you will see a positive impact in terms of both quality and return on investment (ROI).

32:128PR PAUT & 2-ch TOFD Flaw Detector: SyncScan 2

●32:128PR PAUT with optional 2-ch TOFD to maximize your efficiency ●Support PR mode for corrosi
on inspection ●Multiple solutions for welds & corrosion ●Faster scan speed (Approximately 3 meters/minute) ●Light weight: 4kg only including battery

IntraPhase Athena Phased Array System

The Athena Phased Array system, manufactured by WesDyne NDE Products & Technology, consists of a pha
sed array acquisition system and PC running IntraSpect software. A PC is used to perform acquisition, analysis and storage of the data. System hardware is capable of operating up to four data sets with any combination of phased array or conventional UT probes. NOW AVAILABLE IN 64-64 CONFIGURATION.

We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
this is debug window