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use inductive method to measure the distance to the known point.
The path of the pipe is measured, and then another moving direction can be detected,
and the vertical line of the moving direction can be detected, so that the pipeline in
this operation surface can be found out.
(2) Advantages: fast test speed.
(3) Disadvantages: there is a blind spot on a test surface, which is due to parallel
movement, which cannot be divided into too fine angles, and there is a pipeline that
suddenly turns.
(4) Features: this method is the fastest, most effective and suitable for finding a line
with clear direction but not knowing the location.
B) blind test method 2: point measurement.
(1) Operation: on the basis of pre-test preparation, two machines face and maintain
distance. One machine (transmitter) is with the person on the measuring point axis
rotation (center), the other one (receiver) radius is about 7 meters distance two
machine synchronous rotation on the circumference of a circle (note: the two machine
must turn the face to face, namely receiver nose pointing to transmitter. Positive). Be
sure to slow down when rotating, so that the instrument has enough time to reflect.
When transferred to a certain position, the signal strength of the receiver increases
suddenly (the gain is constant, greater than the fixed base before the test), indicating
that there is a metal pipeline between this point and the center of the circle. At this
point, you can raise a bit of the receiver to see if the signal is weakened and then go
down to the ground to see if the signal is enhanced. If so, it is certain that there is a
pipeline underneath. With such a rotation, the pipe can be measured within 2.5 meters
of the measured point (R = 0.5 m). (suggestion: in the process of rotation, the
instrument on the circle is active, and the instrument on the center of the measuring
point is passive, and synchronous face to face rotation. Because the circumference of
the momentum is large, the center of the rotation is small, the human axis is rotating.
After the two known points of the pipeline are measured, the path of the pipeline can