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 -

 350 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?

Product Spotlight

#### GUL Subsea Solutions - Screeening & Monitoring

To inspect new and existing subsea lines, you need proven technology and experience. GUL offers it's
...
technology to solve this challenge: GUL Subsea and gMAT Transducer Rings.
>

#### AIS229 - Multipurpose Real Time System

Latest standard & automatic real time system developed by Balteau. The AIS229 has been designed to
...
do series inspection in a wide variety of industry. Composed of a shielded cabinet, 5 axis manipulator, x-ray generator and tubehead from 160kV to 225kV, a fl at panel & much more, the AIS229 is most certainly one of the most multipurpose RTR system available on the market.
>

#### TESTD-PT SYSTEM

Pulse thermography is a non-contact test method that is ideal for the characterization of thin fil
...
ms and coatings or the detection of defects. With a remarquable short test time and a high detection sensitivity, the Telops TESTD-PT is the perfect tool for non- destructive testing. With such high frame rates, it is even possible to investigate highly conductive or diffusive materials.
>

#### UCI Hardness Tester NOVOTEST T-U2

UCI hardness tester NOVOTEST T-U2 is is used for non-destructive hardness testing of: metals and
...
alloys by scales of hardness: Rockwell (HRC), Brinell (HB), Vickers (HV); non-ferrous metals, alloys of iron etc., and using five additional scales for calibration; with tensile strength (Rm) scale determines the tensile strength of carbon steel pearlitic products by automatic recalculation from Brinell (HB) hardness scale.
>

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