C
Y
K
Tech
www.ceyeko.com
Page 51
Fig. 7 Echo Pattern under Interference of Frequency Converter
The left figure above is the original figure. On the right figure, I enclosed the wave
crests with red circles. The wave crests enclosed by the red circles are uniformly
spaced based on certain laws and they are electromagnetic interferences caused by
typical frequency converter. The figures in the two rows below the base line are not
0 but they don't make sense as they are caused by electromagnetic interference.
The left figure above is the original figure. On the right figure, I enclosed the real ec-
ho with red circles and enclosed the interference waveform with red frame. The in-
terference waveform is quite higher than the real echo and it can not recognized by
the ultrasonic wave.
Fig. 8 Echo Pattern under Interference of Frequency Converter
Fig. 9 Echo Pattern under Interference of Frequency Converter
Fig. 9 is interesting. The echo enclosed by circle is real echo and the echo enclosed
by frame is the interference wave of frequency converter. Although there is interfe-
rence of frequency converter, the data measured at site is correct as the echoed sig-
nal intensity on water surface is obviously stronger than the interference signal of
frequency converter.
Summary of Contents for LUDP
Page 12: ...CYK Tech www ceyeko com Page 12...