Reneman, "Determination of tissue motion velocity by correlation interpolation of pulsed ultrasonic echo
signals," Ultrasonic Imaging, vol.
(2010) proposed to use the nondestructive ultrasonic echo
method to identify macrononhomogeneities and macrocracks in concrete members.
3, [L.sup.1] denotes the first round trip longitudinal-wave ultrasonic echo
reflected from the internal surface of the mold cavity, and [L.sup.2] is the first echo propagating in the plastic plate and reflected from the plastic plate/mold interface.
Feasibility of processing of analogue ultrasonic echo
signal using accessible off-the-shelf components has been experimentally proven.
After excitation of the transducer, the relevant ultrasonic echo
trains take about 700 [micro]s to return since the ultrasound must traverse a meter-long water path.
* The tremendous noise in the area when the rocks are tipped into the passes interferes with ultrasonic echo
- laser is immune to noise interference;
The ultrasonic echo
signals, which are displayed on the screen of the digital oscilloscope, are manually sampled and stored by the computer with a temperature interval of 10[degrees]C.
The researchers proposed to determine the thickness of such elements, using the ultrasonic echo
In the figure, a total of 12,250 ultrasonic echo
signals are displayed from left to right on the horizontal axis (denoted as Acquisition number) as recorded.
Typically the ultrasonic echo
through HDPE appeared a short time after injection, corresponding to the time at which the mold was filled at the location of the transducer.
For measurement of binding, digital ultrasonic echo
pulse velocity meter (Vi Microsystem Ltd.
In order to realize the effective recognition of ultrasonic echo
signal, the frequency-domain signal needs to be received with 40 dB attenuation of low-frequency stage and 60 dB amplification of high-frequency stage, where one can clearly find the contributions of the fundamental and second harmonic waves.