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 -

NDTSS - Non Destructive Testing Society of Singapore
Visit us at SINCE 2019
294 views
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?


    
 
 Reply 
 

Product Spotlight

AMIGO2

TSC Amigo2 - ACFM technology has developed a solid reputation for accurately detecting and sizing
...
surface-breaking cracks through paint and coatings. As the industry demands increased performance in speed, signal quality, and portability, it’s time for an evolution. It’s time for Amigo2.
>

Navic - Steerable Modular Automated Scanner

The Navic is a modular, motorized, steerable scanner designed to carry multiple attachments used
...
in various scanning and inspection applications. The Navic is capable of weld scanning (girth welds and long seam welds), automated corrosion mapping, and tank scanning.
>

High-end Ultrasonic Flaw Detector with 32:128PR PAUT and 2-ch TOFD: SyncScan 2

SIUI’s newly launched SyncScan 2, is a high-end ultrasonic flaw detector with 32:128PR PAUT and
...
2-ch TOFD, which can maximize your efficiency for PA and TOFD. ● Support PA/TOFD/UT ● 32-ch PA is more suitable for inspection on extra-thick wall and high-attenuation material. ● 32-ch PA and 2-ch TOFD work simultaneously. ● Support PR mode for corrosion inspection.
>

NDT Master Lecturer

In the program both university professors and practitioners will give lectures, which guarantees the
...
oretical depth and practical inside. Academic Director: Prof. Dr. Christian Boller
The following lecturers are not complete: Prof. Tadeusz Stepinski, Prof. Wieslaw Staszewski, Prof. Frank Walther, Prof. Giovanni Bruno, Prof. Gerd Dobmann, Prof. Philippe Guy
>

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