164754
17
Zoom out
Zoom in
Previous page
1/114
Next page
DFX-444 Operator’s Manual Issue 3
10
far side of the test piece and reflect back to the transducer/probe
where they are converted into electronic signals and a measurement
is obtained. This technique, derived from sonar and radar, has been
widely applied to nondestructive inspection and dimensional
measurement processes.
4.1 Discontinuity Considerations
The size and geometric shape of the discontinuity relative to the
sound beam size and directivity are also factors that affect the
sensitivity of the test. As the sound beam enters the material, it
spreads and becomes weaker. Therefore, discontinuities farther
from the transducer or front surface of the test part produce a
lower response from the system. This can be overcome by
selectively adjusting the gain of the instrument as a function of
distance traveled through the use of the DFX-444’s Time
Corrected Gain feature. In addition, discontinuities which present
their predominant planar surface to the axis of the sound beam will
produce larger reflections than those which only present an edge
to the sound beam. Some knowledge of these factors along with
an understanding of how discontinuities are formed in the test part
are important for the proper use and effectiveness of this
instrument.
4.2 Ultrasonic Transducer/probes & Sound Fields
The transducer/probe comprises a piezoelectric ceramic material
that generates short bursts of mechanical vibration or sound
waves when it is excited by a short electrical pulse from the DFX-
444. The frequency of the generated sound waves is far beyond
the range of human hearing and can be in the range of 0.1 to 20
MHz. Sound energy at these high frequencies does not travel well
through air. For this reason, a coupling which in most cases is
liquid, must be used between the transducer/probe and the test
piece.
Higher frequency transducer/probes are more sensitive to small
discontinuities due to their smaller wavelength. The wavelength if
17


Need help? Post your question in this forum.

Forumrules


Report abuse

Libble takes abuse of its services very seriously. We're committed to dealing with such abuse according to the laws in your country of residence. When you submit a report, we'll investigate it and take the appropriate action. We'll get back to you only if we require additional details or have more information to share.

Product:

For example, Anti-Semitic content, racist content, or material that could result in a violent physical act.

For example, a credit card number, a personal identification number, or an unlisted home address. Note that email addresses and full names are not considered private information.

Forumrules

To achieve meaningful questions, we apply the following rules:

Register

Register getting emails for Panasonic cq dfx444 at:


You will receive an email to register for one or both of the options.


Get your user manual by e-mail

Enter your email address to receive the manual of Panasonic cq dfx444 in the language / languages: English as an attachment in your email.

The manual is 1,82 mb in size.

 

You will receive the manual in your email within minutes. If you have not received an email, then probably have entered the wrong email address or your mailbox is too full. In addition, it may be that your ISP may have a maximum size for emails to receive.

The manual is sent by email. Check your email

If you have not received an email with the manual within fifteen minutes, it may be that you have a entered a wrong email address or that your ISP has set a maximum size to receive email that is smaller than the size of the manual.

The email address you have provided is not correct.

Please check the email address and correct it.

Your question is posted on this page

Would you like to receive an email when new answers and questions are posted? Please enter your email address.



Info