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Chapter 8: Fault Causes at Site According to Echo Pattern
How to judge the fault causes at site according to echo pattern
The ultrasonic level gauge has a function that it can show the ultrasonic wave form
reflected from the site, so that the fault causes at site can be roughly judged
according to the shape of echo. Now, please allow me to explain it in details.
Enter echo pattern: press the button and hold on, and then press the Set button
and hold on for 3s, an echo pattern will appear.
Exit echo pattern: press the button and hold on, and then press the Set button
and hold on for 3s, the echo pattern will disappear.
When the probe is connected with a metal support or flange, the unceasing vibration
of probe will be transmitted to the metal flange and then reflected by the metal flan-
ge back and accumulated on the probe, forming a strong echoed signal.
As a result, a condition that the water level of the pond is 3m but the ultrasonic level
gauge shows nearly full measuring range appears.
8.1 Resonance
Fig. 1 Echo Signals Caused by Resonance
In the echo pattern, echo close to the left is the echo close to the probe, while the
echo close to the right is the echo away from the probe.
The figure on the left is an ultrasonic echo picture taken at site and the figure on the
right is a comparison graph. The echo in the frame I marked in the right figure is c
used by the resonance between probe and metal support. Although the wave caused
by resonance is fixed and the reflected waves on the right are very clear, the ultra-
sonic level gauge often shows the pool is full because the strength and width of the
reflected waves on the right can not be compared with the wave caused by resonan-
ce.
Summary of Contents for LUDP
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